Merge branch 'master' into gcc-abstraction

Templates/Rulesets/ruleset-empty/osu.Game.Rulesets.EmptyFreeform/Replays/EmptyFreeformFramedReplayInputHandler.cs

@@ -2,13 +2,11 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using osu.Framework.Input.StateChanges;
 using osu.Framework.Utils;
 using osu.Game.Replays;
 using osu.Game.Rulesets.Replays;
-using osuTK;
 
 namespace osu.Game.Rulesets.EmptyFreeform.Replays
 {
@@ -21,26 +19,13 @@ namespace osu.Game.Rulesets.EmptyFreeform.Replays
 
         protected override bool IsImportant(EmptyFreeformReplayFrame frame) => frame.Actions.Any();
 
-        protected Vector2 Position
-        {
-            get
-            {
-                var frame = CurrentFrame;
-
-                if (frame == null)
-                    return Vector2.Zero;
-
-                Debug.Assert(CurrentTime != null);
-
-                return Interpolation.ValueAt(CurrentTime.Value, frame.Position, NextFrame.Position, frame.Time, NextFrame.Time);
-            }
-        }
-
         public override void CollectPendingInputs(List<IInput> inputs)
         {
+            var position = Interpolation.ValueAt(CurrentTime, StartFrame.Position, EndFrame.Position, StartFrame.Time, EndFrame.Time);
+
             inputs.Add(new MousePositionAbsoluteInput
             {
-                Position = GamefieldToScreenSpace(Position),
+                Position = GamefieldToScreenSpace(position),
             });
             inputs.Add(new ReplayState<EmptyFreeformAction>
             {

Templates/Rulesets/ruleset-example/osu.Game.Rulesets.Pippidon/Replays/PippidonFramedReplayInputHandler.cs

@@ -2,12 +2,10 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
-using System.Diagnostics;
 using osu.Framework.Input.StateChanges;
 using osu.Framework.Utils;
 using osu.Game.Replays;
 using osu.Game.Rulesets.Replays;
-using osuTK;
 
 namespace osu.Game.Rulesets.Pippidon.Replays
 {
@@ -20,26 +18,13 @@ namespace osu.Game.Rulesets.Pippidon.Replays
 
         protected override bool IsImportant(PippidonReplayFrame frame) => true;
 
-        protected Vector2 Position
-        {
-            get
-            {
-                var frame = CurrentFrame;
-
-                if (frame == null)
-                    return Vector2.Zero;
-
-                Debug.Assert(CurrentTime != null);
-
-                return NextFrame != null ? Interpolation.ValueAt(CurrentTime.Value, frame.Position, NextFrame.Position, frame.Time, NextFrame.Time) : frame.Position;
-            }
-        }
-
         public override void CollectPendingInputs(List<IInput> inputs)
         {
+            var position = Interpolation.ValueAt(CurrentTime, StartFrame.Position, EndFrame.Position, StartFrame.Time, EndFrame.Time);
+
             inputs.Add(new MousePositionAbsoluteInput
             {
-                Position = GamefieldToScreenSpace(Position)
+                Position = GamefieldToScreenSpace(position)
             });
         }
     }

osu.Android.props

@@ -52,6 +52,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ppy.osu.Game.Resources" Version="2021.412.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.410.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2021.416.0" />
   </ItemGroup>
 </Project>

osu.Android/OsuGameAndroid.cs

@@ -7,6 +7,8 @@ using Android.OS;
 using osu.Framework.Allocation;
 using osu.Game;
 using osu.Game.Updater;
+using osu.Game.Utils;
+using Xamarin.Essentials;
 
 namespace osu.Android
 {
@@ -72,5 +74,14 @@ namespace osu.Android
         }
 
         protected override UpdateManager CreateUpdateManager() => new SimpleUpdateManager();
+
+        protected override BatteryInfo CreateBatteryInfo() => new AndroidBatteryInfo();
+
+        private class AndroidBatteryInfo : BatteryInfo
+        {
+            public override double ChargeLevel => Battery.ChargeLevel;
+
+            public override bool IsCharging => Battery.PowerSource != BatteryPowerSource.Battery;
+        }
     }
 }

osu.Android/Properties/AndroidManifest.xml

@@ -6,5 +6,6 @@
 	<uses-permission android:name="android.permission.WAKE_LOCK" />
 	<uses-permission android:name="android.permission.READ_FRAME_BUFFER" />
 	<uses-permission android:name="android.permission.INTERNET" />
+	<uses-permission android:name="android.permission.BATTERY_STATS" />
 	<application android:allowBackup="true" android:supportsRtl="true" android:label="osu!" android:icon="@drawable/lazer" />
 </manifest>

osu.Android/osu.Android.csproj

@@ -63,5 +63,8 @@
       <Version>5.0.0</Version>
     </PackageReference>
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
 </Project>

osu.Game.Rulesets.Catch/Replays/CatchAutoGenerator.cs

@@ -125,10 +125,6 @@ namespace osu.Game.Rulesets.Catch.Replays
 
         private void addFrame(double time, float? position = null, bool dashing = false)
         {
-            // todo: can be removed once FramedReplayInputHandler correctly handles rewinding before first frame.
-            if (Replay.Frames.Count == 0)
-                Replay.Frames.Add(new CatchReplayFrame(time - 1, position, false, null));
-
             var last = currentFrame;
             currentFrame = new CatchReplayFrame(time, position, dashing, last);
             Replay.Frames.Add(currentFrame);

osu.Game.Rulesets.Catch/Replays/CatchFramedReplayInputHandler.cs

@@ -2,7 +2,6 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using osu.Framework.Input.StateChanges;
 using osu.Framework.Utils;
@@ -20,29 +19,14 @@ namespace osu.Game.Rulesets.Catch.Replays
 
         protected override bool IsImportant(CatchReplayFrame frame) => frame.Actions.Any();
 
-        protected float? Position
-        {
-            get
-            {
-                var frame = CurrentFrame;
-
-                if (frame == null)
-                    return null;
-
-                Debug.Assert(CurrentTime != null);
-
-                return NextFrame != null ? Interpolation.ValueAt(CurrentTime.Value, frame.Position, NextFrame.Position, frame.Time, NextFrame.Time) : frame.Position;
-            }
-        }
-
         public override void CollectPendingInputs(List<IInput> inputs)
         {
-            if (!Position.HasValue) return;
+            var position = Interpolation.ValueAt(CurrentTime, StartFrame.Position, EndFrame.Position, StartFrame.Time, EndFrame.Time);
 
             inputs.Add(new CatchReplayState
             {
                 PressedActions = CurrentFrame?.Actions ?? new List<CatchAction>(),
-                CatcherX = Position.Value
+                CatcherX = position
             });
         }
 

osu.Game.Rulesets.Mania.Tests/TestSceneAutoGeneration.cs

@@ -19,7 +19,7 @@ namespace osu.Game.Rulesets.Mania.Tests
         /// <summary>
         /// The number of frames which are generated at the start of a replay regardless of hitobject content.
         /// </summary>
-        private const int frame_offset = 1;
+        private const int frame_offset = 0;
 
         [Test]
         public void TestSingleNote()
@@ -33,7 +33,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
             var generated = new ManiaAutoGenerator(beatmap).Generate();
 
-            Assert.IsTrue(generated.Frames.Count == frame_offset + 2, "Replay must have 3 frames");
+            Assert.AreEqual(generated.Frames.Count, frame_offset + 2, "Incorrect number of frames");
             Assert.AreEqual(1000, generated.Frames[frame_offset].Time, "Incorrect hit time");
             Assert.AreEqual(1000 + ManiaAutoGenerator.RELEASE_DELAY, generated.Frames[frame_offset + 1].Time, "Incorrect release time");
             Assert.IsTrue(checkContains(generated.Frames[frame_offset], ManiaAction.Special1), "Special1 has not been pressed");
@@ -54,7 +54,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
             var generated = new ManiaAutoGenerator(beatmap).Generate();
 
-            Assert.IsTrue(generated.Frames.Count == frame_offset + 2, "Replay must have 3 frames");
+            Assert.AreEqual(generated.Frames.Count, frame_offset + 2, "Incorrect number of frames");
             Assert.AreEqual(1000, generated.Frames[frame_offset].Time, "Incorrect hit time");
             Assert.AreEqual(3000, generated.Frames[frame_offset + 1].Time, "Incorrect release time");
             Assert.IsTrue(checkContains(generated.Frames[frame_offset], ManiaAction.Special1), "Special1 has not been pressed");
@@ -74,7 +74,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
             var generated = new ManiaAutoGenerator(beatmap).Generate();
 
-            Assert.IsTrue(generated.Frames.Count == frame_offset + 2, "Replay must have 3 frames");
+            Assert.AreEqual(generated.Frames.Count, frame_offset + 2, "Incorrect number of frames");
             Assert.AreEqual(1000, generated.Frames[frame_offset].Time, "Incorrect hit time");
             Assert.AreEqual(1000 + ManiaAutoGenerator.RELEASE_DELAY, generated.Frames[frame_offset + 1].Time, "Incorrect release time");
             Assert.IsTrue(checkContains(generated.Frames[frame_offset], ManiaAction.Key1, ManiaAction.Key2), "Key1 & Key2 have not been pressed");
@@ -96,7 +96,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
             var generated = new ManiaAutoGenerator(beatmap).Generate();
 
-            Assert.IsTrue(generated.Frames.Count == frame_offset + 2, "Replay must have 3 frames");
+            Assert.AreEqual(generated.Frames.Count, frame_offset + 2, "Incorrect number of frames");
 
             Assert.AreEqual(1000, generated.Frames[frame_offset].Time, "Incorrect hit time");
             Assert.AreEqual(3000, generated.Frames[frame_offset + 1].Time, "Incorrect release time");
@@ -119,7 +119,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
             var generated = new ManiaAutoGenerator(beatmap).Generate();
 
-            Assert.IsTrue(generated.Frames.Count == frame_offset + 4, "Replay must have 4 generated frames");
+            Assert.AreEqual(generated.Frames.Count, frame_offset + 4, "Incorrect number of frames");
             Assert.AreEqual(1000, generated.Frames[frame_offset].Time, "Incorrect first note hit time");
             Assert.AreEqual(1000 + ManiaAutoGenerator.RELEASE_DELAY, generated.Frames[frame_offset + 1].Time, "Incorrect first note release time");
             Assert.AreEqual(2000, generated.Frames[frame_offset + 2].Time, "Incorrect second note hit time");
@@ -146,7 +146,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
             var generated = new ManiaAutoGenerator(beatmap).Generate();
 
-            Assert.IsTrue(generated.Frames.Count == frame_offset + 4, "Replay must have 4 generated frames");
+            Assert.AreEqual(generated.Frames.Count, frame_offset + 4, "Incorrect number of frames");
             Assert.AreEqual(1000, generated.Frames[frame_offset].Time, "Incorrect first note hit time");
             Assert.AreEqual(3000, generated.Frames[frame_offset + 2].Time, "Incorrect first note release time");
             Assert.AreEqual(2000, generated.Frames[frame_offset + 1].Time, "Incorrect second note hit time");
@@ -173,7 +173,7 @@ namespace osu.Game.Rulesets.Mania.Tests
 
             var generated = new ManiaAutoGenerator(beatmap).Generate();
 
-            Assert.IsTrue(generated.Frames.Count == frame_offset + 3, "Replay must have 3 generated frames");
+            Assert.AreEqual(generated.Frames.Count, frame_offset + 3, "Incorrect number of frames");
             Assert.AreEqual(1000, generated.Frames[frame_offset].Time, "Incorrect first note hit time");
             Assert.AreEqual(3000, generated.Frames[frame_offset + 1].Time, "Incorrect second note press time + first note release time");
             Assert.AreEqual(3000 + ManiaAutoGenerator.RELEASE_DELAY, generated.Frames[frame_offset + 2].Time, "Incorrect second note release time");

osu.Game.Rulesets.Mania/Edit/Blueprints/HoldNotePlacementBlueprint.cs

@@ -82,7 +82,7 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
         {
             base.UpdateTimeAndPosition(result);
 
-            if (PlacementActive)
+            if (PlacementActive == PlacementState.Active)
             {
                 if (result.Time is double endTime)
                 {

osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaPlacementBlueprint.cs

@@ -52,7 +52,7 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
         {
             base.UpdateTimeAndPosition(result);
 
-            if (!PlacementActive)
+            if (PlacementActive == PlacementState.Waiting)
                 Column = result.Playfield as Column;
         }
     }

osu.Game.Rulesets.Mania/Mods/ManiaModMirror.cs

@@ -15,6 +15,7 @@ namespace osu.Game.Rulesets.Mania.Mods
         public override string Name => "Mirror";
         public override string Acronym => "MR";
         public override ModType Type => ModType.Conversion;
+        public override string Description => "Notes are flipped horizontally.";
         public override double ScoreMultiplier => 1;
         public override bool Ranked => true;
 

osu.Game.Rulesets.Mania/Replays/ManiaAutoGenerator.cs

@@ -70,10 +70,6 @@ namespace osu.Game.Rulesets.Mania.Replays
                     }
                 }
 
-                // todo: can be removed once FramedReplayInputHandler correctly handles rewinding before first frame.
-                if (Replay.Frames.Count == 0)
-                    Replay.Frames.Add(new ManiaReplayFrame(group.First().Time - 1));
-
                 Replay.Frames.Add(new ManiaReplayFrame(group.First().Time, actions.ToArray()));
             }
 

osu.Game.Rulesets.Osu.Tests/Editor/Checks/CheckOffscreenObjectsTest.cs

@@ -0,0 +1,260 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Edit.Checks;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.UI;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor.Checks
+{
+    [TestFixture]
+    public class CheckOffscreenObjectsTest
+    {
+        private static readonly Vector2 playfield_centre = OsuPlayfield.BASE_SIZE * 0.5f;
+
+        private CheckOffscreenObjects check;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckOffscreenObjects();
+        }
+
+        [Test]
+        public void TestCircleInCenter()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre // Playfield is 640 x 480.
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestCircleNearEdge()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(5, 5)
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestCircleNearEdgeStackedOffscreen()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(5, 5),
+                        StackHeight = 5
+                    }
+                }
+            };
+
+            assertOffscreenCircle(beatmap);
+        }
+
+        [Test]
+        public void TestCircleOffscreen()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new HitCircle
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(0, 0)
+                    }
+                }
+            };
+
+            assertOffscreenCircle(beatmap);
+        }
+
+        [Test]
+        public void TestSliderInCenter()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(420, 240),
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(new Vector2(-100, 0))
+                        }),
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestSliderNearEdge()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(new Vector2(0, -playfield_centre.Y + 5))
+                        }),
+                    }
+                }
+            };
+
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestSliderNearEdgeStackedOffscreen()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(new Vector2(0, -playfield_centre.Y + 5))
+                        }),
+                        StackHeight = 5
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        [Test]
+        public void TestSliderOffscreenStart()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = new Vector2(0, 0),
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(playfield_centre)
+                        }),
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        [Test]
+        public void TestSliderOffscreenEnd()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            new PathControlPoint(new Vector2(0, 0), PathType.Linear),
+                            new PathControlPoint(-playfield_centre)
+                        }),
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        [Test]
+        public void TestSliderOffscreenPath()
+        {
+            var beatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Slider
+                    {
+                        StartTime = 3000,
+                        Position = playfield_centre,
+                        Path = new SliderPath(new[]
+                        {
+                            // Circular arc shoots over the top of the screen.
+                            new PathControlPoint(new Vector2(0, 0), PathType.PerfectCurve),
+                            new PathControlPoint(new Vector2(-100, -200)),
+                            new PathControlPoint(new Vector2(100, -200))
+                        }),
+                    }
+                }
+            };
+
+            assertOffscreenSlider(beatmap);
+        }
+
+        private void assertOffscreenCircle(IBeatmap beatmap)
+        {
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckOffscreenObjects.IssueTemplateOffscreenCircle);
+        }
+
+        private void assertOffscreenSlider(IBeatmap beatmap)
+        {
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckOffscreenObjects.IssueTemplateOffscreenSlider);
+        }
+    }
+}

osu.Game.Rulesets.Osu.Tests/Editor/TestSceneOsuEditorSelectInvalidPath.cs

@@ -0,0 +1,46 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Tests.Beatmaps;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor
+{
+    public class TestSceneOsuEditorSelectInvalidPath : EditorTestScene
+    {
+        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
+
+        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(ruleset, false);
+
+        [Test]
+        public void TestSelectDoesNotModify()
+        {
+            Slider slider = new Slider { StartTime = 0, Position = new Vector2(320, 40) };
+
+            PathControlPoint[] points =
+            {
+                new PathControlPoint(new Vector2(0), PathType.PerfectCurve),
+                new PathControlPoint(new Vector2(-100, 0)),
+                new PathControlPoint(new Vector2(100, 20))
+            };
+
+            int preSelectVersion = -1;
+            AddStep("add slider", () =>
+            {
+                slider.Path = new SliderPath(points);
+                EditorBeatmap.Add(slider);
+                preSelectVersion = slider.Path.Version.Value;
+            });
+
+            AddStep("select added slider", () => EditorBeatmap.SelectedHitObjects.Add(slider));
+
+            AddAssert("slider same path", () => slider.Path.Version.Value == preSelectVersion);
+        }
+    }
+}

osu.Game.Rulesets.Osu.Tests/Editor/TestSceneSliderLengthValidity.cs

@@ -0,0 +1,198 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.UI;
+using osu.Game.Screens.Edit.Compose.Components;
+using osu.Game.Tests.Beatmaps;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor
+{
+    [TestFixture]
+    public class TestSceneSliderLengthValidity : TestSceneOsuEditor
+    {
+        private OsuPlayfield playfield;
+
+        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(Ruleset.Value, false);
+
+        public override void SetUpSteps()
+        {
+            base.SetUpSteps();
+            AddStep("get playfield", () => playfield = Editor.ChildrenOfType<OsuPlayfield>().First());
+            AddStep("seek to first timing point", () => EditorClock.Seek(Beatmap.Value.Beatmap.ControlPointInfo.TimingPoints.First().Time));
+        }
+
+        [Test]
+        public void TestDraggingStartingPointRemainsValid()
+        {
+            Slider slider = null;
+
+            AddStep("Add slider", () =>
+            {
+                slider = new Slider { StartTime = EditorClock.CurrentTime, Position = new Vector2(300) };
+
+                PathControlPoint[] points =
+                {
+                    new PathControlPoint(new Vector2(0), PathType.Linear),
+                    new PathControlPoint(new Vector2(100, 0)),
+                };
+
+                slider.Path = new SliderPath(points);
+                EditorBeatmap.Add(slider);
+            });
+
+            AddAssert("ensure object placed", () => EditorBeatmap.HitObjects.Count == 1);
+
+            moveMouse(new Vector2(300));
+            AddStep("select slider", () => InputManager.Click(MouseButton.Left));
+
+            double distanceBefore = 0;
+
+            AddStep("store distance", () => distanceBefore = slider.Path.Distance);
+
+            moveMouse(new Vector2(300, 300));
+
+            AddStep("begin drag", () => InputManager.PressButton(MouseButton.Left));
+            moveMouse(new Vector2(350, 300));
+            moveMouse(new Vector2(400, 300));
+            AddStep("end drag", () => InputManager.ReleaseButton(MouseButton.Left));
+
+            AddAssert("slider length shrunk", () => slider.Path.Distance < distanceBefore);
+            AddAssert("ensure slider still has valid length", () => slider.Path.Distance > 0);
+        }
+
+        [Test]
+        public void TestDraggingEndingPointRemainsValid()
+        {
+            Slider slider = null;
+
+            AddStep("Add slider", () =>
+            {
+                slider = new Slider { StartTime = EditorClock.CurrentTime, Position = new Vector2(300) };
+
+                PathControlPoint[] points =
+                {
+                    new PathControlPoint(new Vector2(0), PathType.Linear),
+                    new PathControlPoint(new Vector2(100, 0)),
+                };
+
+                slider.Path = new SliderPath(points);
+                EditorBeatmap.Add(slider);
+            });
+
+            AddAssert("ensure object placed", () => EditorBeatmap.HitObjects.Count == 1);
+
+            moveMouse(new Vector2(300));
+            AddStep("select slider", () => InputManager.Click(MouseButton.Left));
+
+            double distanceBefore = 0;
+
+            AddStep("store distance", () => distanceBefore = slider.Path.Distance);
+
+            moveMouse(new Vector2(400, 300));
+
+            AddStep("begin drag", () => InputManager.PressButton(MouseButton.Left));
+            moveMouse(new Vector2(350, 300));
+            moveMouse(new Vector2(300, 300));
+            AddStep("end drag", () => InputManager.ReleaseButton(MouseButton.Left));
+
+            AddAssert("slider length shrunk", () => slider.Path.Distance < distanceBefore);
+            AddAssert("ensure slider still has valid length", () => slider.Path.Distance > 0);
+        }
+
+        /// <summary>
+        /// If a control point is deleted which results in the slider becoming so short it can't exist,
+        /// for simplicity delete the slider rather than having it in an invalid state.
+        ///
+        /// Eventually we may need to change this, based on user feedback. I think it's likely enough of
+        /// an edge case that we won't get many complaints, though (and there's always the undo button).
+        /// </summary>
+        [Test]
+        public void TestDeletingPointCausesSliderDeletion()
+        {
+            AddStep("Add slider", () =>
+            {
+                Slider slider = new Slider { StartTime = EditorClock.CurrentTime, Position = new Vector2(300) };
+
+                PathControlPoint[] points =
+                {
+                    new PathControlPoint(new Vector2(0), PathType.PerfectCurve),
+                    new PathControlPoint(new Vector2(100, 0)),
+                    new PathControlPoint(new Vector2(0, 10))
+                };
+
+                slider.Path = new SliderPath(points);
+                EditorBeatmap.Add(slider);
+            });
+
+            AddAssert("ensure object placed", () => EditorBeatmap.HitObjects.Count == 1);
+
+            AddStep("select slider", () => InputManager.Click(MouseButton.Left));
+
+            moveMouse(new Vector2(400, 300));
+            AddStep("delete second point", () =>
+            {
+                InputManager.PressKey(Key.ShiftLeft);
+                InputManager.Click(MouseButton.Right);
+                InputManager.ReleaseKey(Key.ShiftLeft);
+            });
+
+            AddAssert("ensure object deleted", () => EditorBeatmap.HitObjects.Count == 0);
+        }
+
+        /// <summary>
+        /// If a scale operation is performed where a single slider is the only thing selected, the path's shape will change.
+        /// If the scale results in the path becoming too short, further mouse movement in the same direction will not change the shape.
+        /// </summary>
+        [Test]
+        public void TestScalingSliderTooSmallRemainsValid()
+        {
+            Slider slider = null;
+
+            AddStep("Add slider", () =>
+            {
+                slider = new Slider { StartTime = EditorClock.CurrentTime, Position = new Vector2(300, 200) };
+
+                PathControlPoint[] points =
+                {
+                    new PathControlPoint(new Vector2(0), PathType.Linear),
+                    new PathControlPoint(new Vector2(0, 50)),
+                    new PathControlPoint(new Vector2(0, 100))
+                };
+
+                slider.Path = new SliderPath(points);
+                EditorBeatmap.Add(slider);
+            });
+
+            AddAssert("ensure object placed", () => EditorBeatmap.HitObjects.Count == 1);
+
+            moveMouse(new Vector2(300));
+            AddStep("select slider", () => InputManager.Click(MouseButton.Left));
+
+            double distanceBefore = 0;
+
+            AddStep("store distance", () => distanceBefore = slider.Path.Distance);
+
+            AddStep("move mouse to handle", () => InputManager.MoveMouseTo(Editor.ChildrenOfType<SelectionBoxDragHandle>().Skip(1).First()));
+            AddStep("begin drag", () => InputManager.PressButton(MouseButton.Left));
+            moveMouse(new Vector2(300, 300));
+            moveMouse(new Vector2(300, 250));
+            moveMouse(new Vector2(300, 200));
+            AddStep("end drag", () => InputManager.ReleaseButton(MouseButton.Left));
+
+            AddAssert("slider length shrunk", () => slider.Path.Distance < distanceBefore);
+            AddAssert("ensure slider still has valid length", () => slider.Path.Distance > 0);
+        }
+
+        private void moveMouse(Vector2 pos) =>
+            AddStep($"move mouse to {pos}", () => InputManager.MoveMouseTo(playfield.ToScreenSpace(pos)));
+    }
+}

osu.Game.Rulesets.Osu.Tests/Editor/TestSceneSliderPlacementBlueprint.cs

@@ -41,9 +41,7 @@ namespace osu.Game.Rulesets.Osu.Tests.Editor
             addClickStep(MouseButton.Left);
             addClickStep(MouseButton.Right);
 
-            assertPlaced(true);
-            assertLength(0);
-            assertControlPointType(0, PathType.Linear);
+            assertPlaced(false);
         }
 
         [Test]

osu.Game.Rulesets.Osu.Tests/Editor/TestSliderScaling.cs

@@ -0,0 +1,72 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.UI;
+using osu.Game.Screens.Edit.Compose.Components;
+using osu.Game.Tests.Beatmaps;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Rulesets.Osu.Tests.Editor
+{
+    [TestFixture]
+    public class TestSliderScaling : TestSceneOsuEditor
+    {
+        private OsuPlayfield playfield;
+
+        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(Ruleset.Value, false);
+
+        public override void SetUpSteps()
+        {
+            base.SetUpSteps();
+            AddStep("get playfield", () => playfield = Editor.ChildrenOfType<OsuPlayfield>().First());
+            AddStep("seek to first timing point", () => EditorClock.Seek(Beatmap.Value.Beatmap.ControlPointInfo.TimingPoints.First().Time));
+        }
+
+        [Test]
+        public void TestScalingLinearSlider()
+        {
+            Slider slider = null;
+
+            AddStep("Add slider", () =>
+            {
+                slider = new Slider { StartTime = EditorClock.CurrentTime, Position = new Vector2(300) };
+
+                PathControlPoint[] points =
+                {
+                    new PathControlPoint(new Vector2(0), PathType.Linear),
+                    new PathControlPoint(new Vector2(100, 0)),
+                };
+
+                slider.Path = new SliderPath(points);
+                EditorBeatmap.Add(slider);
+            });
+
+            AddAssert("ensure object placed", () => EditorBeatmap.HitObjects.Count == 1);
+
+            moveMouse(new Vector2(300));
+            AddStep("select slider", () => InputManager.Click(MouseButton.Left));
+
+            double distanceBefore = 0;
+
+            AddStep("store distance", () => distanceBefore = slider.Path.Distance);
+
+            AddStep("move mouse to handle", () => InputManager.MoveMouseTo(Editor.ChildrenOfType<SelectionBoxDragHandle>().Skip(1).First()));
+            AddStep("begin drag", () => InputManager.PressButton(MouseButton.Left));
+            moveMouse(new Vector2(300, 300));
+            AddStep("end drag", () => InputManager.ReleaseButton(MouseButton.Left));
+
+            AddAssert("slider length shrunk", () => slider.Path.Distance < distanceBefore);
+        }
+
+        private void moveMouse(Vector2 pos) =>
+            AddStep($"move mouse to {pos}", () => InputManager.MoveMouseTo(playfield.ToScreenSpace(pos)));
+    }
+}

osu.Game.Rulesets.Osu.Tests/TestSceneCursorTrail.cs

@@ -78,7 +78,7 @@ namespace osu.Game.Rulesets.Osu.Tests
                 RelativeSizeAxes = Axes.Both;
             }
 
-            public Drawable GetDrawableComponent(ISkinComponent component) => throw new NotImplementedException();
+            public Drawable GetDrawableComponent(ISkinComponent component) => null;
 
             public Texture GetTexture(string componentName, WrapMode wrapModeS, WrapMode wrapModeT)
             {
@@ -98,9 +98,9 @@ namespace osu.Game.Rulesets.Osu.Tests
                 return null;
             }
 
-            public ISample GetSample(ISampleInfo sampleInfo) => throw new NotImplementedException();
+            public ISample GetSample(ISampleInfo sampleInfo) => null;
 
-            public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => throw new NotImplementedException();
+            public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => null;
 
             public event Action SourceChanged
             {

osu.Game.Rulesets.Osu.Tests/TestSceneGameplayCursor.cs

@@ -4,13 +4,22 @@
 using System;
 using NUnit.Framework;
 using osu.Framework.Allocation;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.OpenGL.Textures;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Graphics.Textures;
+using osu.Framework.Input;
 using osu.Framework.Testing.Input;
 using osu.Framework.Utils;
+using osu.Game.Audio;
 using osu.Game.Configuration;
+using osu.Game.Rulesets.Osu.Skinning;
 using osu.Game.Rulesets.Osu.UI.Cursor;
 using osu.Game.Screens.Play;
+using osu.Game.Skinning;
 using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Tests
@@ -21,7 +30,7 @@ namespace osu.Game.Rulesets.Osu.Tests
         [Cached]
         private GameplayBeatmap gameplayBeatmap;
 
-        private ClickingCursorContainer lastContainer;
+        private OsuCursorContainer lastContainer;
 
         [Resolved]
         private OsuConfigManager config { get; set; }
@@ -48,12 +57,10 @@ namespace osu.Game.Rulesets.Osu.Tests
             {
                 config.SetValue(OsuSetting.AutoCursorSize, true);
                 gameplayBeatmap.BeatmapInfo.BaseDifficulty.CircleSize = val;
-                Scheduler.AddOnce(recreate);
+                Scheduler.AddOnce(() => loadContent(false));
             });
 
-            AddStep("test cursor container", recreate);
-
-            void recreate() => SetContents(() => new OsuInputManager(new OsuRuleset().RulesetInfo) { Child = new OsuCursorContainer() });
+            AddStep("test cursor container", () => loadContent(false));
         }
 
         [TestCase(1, 1)]
@@ -68,7 +75,7 @@ namespace osu.Game.Rulesets.Osu.Tests
             AddStep($"adjust cs to {circleSize}", () => gameplayBeatmap.BeatmapInfo.BaseDifficulty.CircleSize = circleSize);
             AddStep("turn on autosizing", () => config.SetValue(OsuSetting.AutoCursorSize, true));
 
-            AddStep("load content", loadContent);
+            AddStep("load content", () => loadContent());
 
             AddUntilStep("cursor size correct", () => lastContainer.ActiveCursor.Scale.X == OsuCursorContainer.GetScaleForCircleSize(circleSize) * userScale);
 
@@ -82,18 +89,46 @@ namespace osu.Game.Rulesets.Osu.Tests
             AddUntilStep("cursor size correct", () => lastContainer.ActiveCursor.Scale.X == userScale);
         }
 
-        private void loadContent()
+        [Test]
+        public void TestTopLeftOrigin()
         {
-            SetContents(() => new MovingCursorInputManager
+            AddStep("load content", () => loadContent(false, () => new SkinProvidingContainer(new TopLeftCursorSkin())));
+        }
+
+        private void loadContent(bool automated = true, Func<SkinProvidingContainer> skinProvider = null)
+        {
+            SetContents(() =>
             {
-                Child = lastContainer = new ClickingCursorContainer
-                {
-                    RelativeSizeAxes = Axes.Both,
-                    Masking = true,
-                }
+                var inputManager = automated ? (InputManager)new MovingCursorInputManager() : new OsuInputManager(new OsuRuleset().RulesetInfo);
+                var skinContainer = skinProvider?.Invoke() ?? new SkinProvidingContainer(null);
+
+                lastContainer = automated ? new ClickingCursorContainer() : new OsuCursorContainer();
+
+                return inputManager.WithChild(skinContainer.WithChild(lastContainer));
             });
         }
 
+        private class TopLeftCursorSkin : ISkin
+        {
+            public Drawable GetDrawableComponent(ISkinComponent component) => null;
+            public Texture GetTexture(string componentName, WrapMode wrapModeS, WrapMode wrapModeT) => null;
+            public ISample GetSample(ISampleInfo sampleInfo) => null;
+
+            public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup)
+            {
+                switch (lookup)
+                {
+                    case OsuSkinConfiguration osuLookup:
+                        if (osuLookup == OsuSkinConfiguration.CursorCentre)
+                            return SkinUtils.As<TValue>(new BindableBool(false));
+
+                        break;
+                }
+
+                return null;
+            }
+        }
+
         private class ClickingCursorContainer : OsuCursorContainer
         {
             private bool pressed;

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/PathControlPointPiece.cs

@@ -59,11 +59,14 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             this.slider = slider;
             ControlPoint = controlPoint;
 
+            // we don't want to run the path type update on construction as it may inadvertently change the slider.
+            cachePoints(slider);
+
             slider.Path.Version.BindValueChanged(_ =>
             {
-                PointsInSegment = slider.Path.PointsInSegment(ControlPoint);
+                cachePoints(slider);
                 updatePathType();
-            }, runOnceImmediately: true);
+            });
 
             controlPoint.Type.BindValueChanged(_ => updateMarkerDisplay());
 
@@ -182,6 +185,10 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 
         protected override void OnDrag(DragEvent e)
         {
+            Vector2[] oldControlPoints = slider.Path.ControlPoints.Select(cp => cp.Position.Value).ToArray();
+            var oldPosition = slider.Position;
+            var oldStartTime = slider.StartTime;
+
             if (ControlPoint == slider.Path.ControlPoints[0])
             {
                 // Special handling for the head control point - the position of the slider changes which means the snapped position and time have to be taken into account
@@ -199,12 +206,24 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             else
                 ControlPoint.Position.Value = dragStartPosition + (e.MousePosition - e.MouseDownPosition);
 
+            if (!slider.Path.HasValidLength)
+            {
+                for (var i = 0; i < slider.Path.ControlPoints.Count; i++)
+                    slider.Path.ControlPoints[i].Position.Value = oldControlPoints[i];
+
+                slider.Position = oldPosition;
+                slider.StartTime = oldStartTime;
+                return;
+            }
+
             // Maintain the path type in case it got defaulted to bezier at some point during the drag.
             PointsInSegment[0].Type.Value = dragPathType;
         }
 
         protected override void OnDragEnd(DragEndEvent e) => changeHandler?.EndChange();
 
+        private void cachePoints(Slider slider) => PointsInSegment = slider.Path.PointsInSegment(ControlPoint);
+
         /// <summary>
         /// Handles correction of invalid path types.
         /// </summary>

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/SliderPlacementBlueprint.cs

@@ -30,7 +30,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
         private InputManager inputManager;
 
-        private PlacementState state;
+        private SliderPlacementState state;
         private PathControlPoint segmentStart;
         private PathControlPoint cursor;
         private int currentSegmentLength;
@@ -58,7 +58,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
                 controlPointVisualiser = new PathControlPointVisualiser(HitObject, false)
             };
 
-            setState(PlacementState.Initial);
+            setState(SliderPlacementState.Initial);
         }
 
         protected override void LoadComplete()
@@ -73,12 +73,12 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
             switch (state)
             {
-                case PlacementState.Initial:
+                case SliderPlacementState.Initial:
                     BeginPlacement();
                     HitObject.Position = ToLocalSpace(result.ScreenSpacePosition);
                     break;
 
-                case PlacementState.Body:
+                case SliderPlacementState.Body:
                     updateCursor();
                     break;
             }
@@ -91,11 +91,11 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
             switch (state)
             {
-                case PlacementState.Initial:
+                case SliderPlacementState.Initial:
                     beginCurve();
                     break;
 
-                case PlacementState.Body:
+                case SliderPlacementState.Body:
                     if (canPlaceNewControlPoint(out var lastPoint))
                     {
                         // Place a new point by detatching the current cursor.
@@ -121,7 +121,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
         protected override void OnMouseUp(MouseUpEvent e)
         {
-            if (state == PlacementState.Body && e.Button == MouseButton.Right)
+            if (state == SliderPlacementState.Body && e.Button == MouseButton.Right)
                 endCurve();
             base.OnMouseUp(e);
         }
@@ -129,13 +129,13 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
         private void beginCurve()
         {
             BeginPlacement(commitStart: true);
-            setState(PlacementState.Body);
+            setState(SliderPlacementState.Body);
         }
 
         private void endCurve()
         {
             updateSlider();
-            EndPlacement(true);
+            EndPlacement(HitObject.Path.HasValidLength);
         }
 
         protected override void Update()
@@ -219,12 +219,12 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
             tailCirclePiece.UpdateFrom(HitObject.TailCircle);
         }
 
-        private void setState(PlacementState newState)
+        private void setState(SliderPlacementState newState)
         {
             state = newState;
         }
 
-        private enum PlacementState
+        private enum SliderPlacementState
         {
             Initial,
             Body,

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/SliderSelectionBlueprint.cs

@@ -215,7 +215,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
             }
 
             // If there are 0 or 1 remaining control points, the slider is in a degenerate (single point) form and should be deleted
-            if (controlPoints.Count <= 1)
+            if (controlPoints.Count <= 1 || !slider.HitObject.Path.HasValidLength)
             {
                 placementHandler?.Delete(HitObject);
                 return;

osu.Game.Rulesets.Osu/Edit/Checks/CheckOffscreenObjects.cs

@@ -0,0 +1,115 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Osu.Objects;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Edit.Checks
+{
+    public class CheckOffscreenObjects : ICheck
+    {
+        // A close approximation for the bounding box of the screen in gameplay on 4:3 aspect ratio.
+        // Uses gameplay space coordinates (512 x 384 playfield / 640 x 480 screen area).
+        // See https://github.com/ppy/osu/pull/12361#discussion_r612199777 for reference.
+        private const int min_x = -67;
+        private const int min_y = -60;
+        private const int max_x = 579;
+        private const int max_y = 428;
+
+        // The amount of milliseconds to step through a slider path at a time
+        // (higher = more performant, but higher false-negative chance).
+        private const int path_step_size = 5;
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Compose, "Offscreen hitobjects");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateOffscreenCircle(this),
+            new IssueTemplateOffscreenSlider(this)
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap)
+        {
+            foreach (var hitobject in beatmap.HitObjects)
+            {
+                switch (hitobject)
+                {
+                    case Slider slider:
+                    {
+                        foreach (var issue in sliderIssues(slider))
+                            yield return issue;
+
+                        break;
+                    }
+
+                    case HitCircle circle:
+                    {
+                        if (isOffscreen(circle.StackedPosition, circle.Radius))
+                            yield return new IssueTemplateOffscreenCircle(this).Create(circle);
+
+                        break;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Steps through points on the slider to ensure the entire path is on-screen.
+        /// Returns at most one issue.
+        /// </summary>
+        /// <param name="slider">The slider whose path to check.</param>
+        /// <returns></returns>
+        private IEnumerable<Issue> sliderIssues(Slider slider)
+        {
+            for (int i = 0; i < slider.Distance; i += path_step_size)
+            {
+                double progress = i / slider.Distance;
+                Vector2 position = slider.StackedPositionAt(progress);
+
+                if (!isOffscreen(position, slider.Radius))
+                    continue;
+
+                // `SpanDuration` ensures we don't include reverses.
+                double time = slider.StartTime + progress * slider.SpanDuration;
+                yield return new IssueTemplateOffscreenSlider(this).Create(slider, time);
+
+                yield break;
+            }
+
+            // Above loop may skip the last position in the slider due to step size.
+            if (!isOffscreen(slider.StackedEndPosition, slider.Radius))
+                yield break;
+
+            yield return new IssueTemplateOffscreenSlider(this).Create(slider, slider.EndTime);
+        }
+
+        private bool isOffscreen(Vector2 position, double radius)
+        {
+            return position.X - radius < min_x || position.X + radius > max_x ||
+                   position.Y - radius < min_y || position.Y + radius > max_y;
+        }
+
+        public class IssueTemplateOffscreenCircle : IssueTemplate
+        {
+            public IssueTemplateOffscreenCircle(ICheck check)
+                : base(check, IssueType.Problem, "This circle goes offscreen on a 4:3 aspect ratio.")
+            {
+            }
+
+            public Issue Create(HitCircle circle) => new Issue(circle, this);
+        }
+
+        public class IssueTemplateOffscreenSlider : IssueTemplate
+        {
+            public IssueTemplateOffscreenSlider(ICheck check)
+                : base(check, IssueType.Problem, "This slider goes offscreen here on a 4:3 aspect ratio.")
+            {
+            }
+
+            public Issue Create(Slider slider, double offscreenTime) => new Issue(slider, this) { Time = offscreenTime };
+        }
+    }
+}

osu.Game.Rulesets.Osu/Edit/OsuBeatmapVerifier.cs

@@ -0,0 +1,22 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Osu.Edit.Checks;
+
+namespace osu.Game.Rulesets.Osu.Edit
+{
+    public class OsuBeatmapVerifier : IBeatmapVerifier
+    {
+        private readonly List<ICheck> checks = new List<ICheck>
+        {
+            new CheckOffscreenObjects()
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap) => checks.SelectMany(check => check.Run(beatmap));
+    }
+}

osu.Game.Rulesets.Osu/Edit/OsuSelectionHandler.cs

@@ -205,10 +205,12 @@ namespace osu.Game.Rulesets.Osu.Edit
 
             Quad sliderQuad = getSurroundingQuad(slider.Path.ControlPoints.Select(p => p.Position.Value));
 
-            // Limit minimum distance between control points  after scaling to almost 0. Less than 0 causes the slider to flip, exactly 0 causes a crash through division by 0.
+            // Limit minimum distance between control points after scaling to almost 0. Less than 0 causes the slider to flip, exactly 0 causes a crash through division by 0.
             scale = Vector2.ComponentMax(new Vector2(Precision.FLOAT_EPSILON), sliderQuad.Size + scale) - sliderQuad.Size;
 
-            Vector2 pathRelativeDeltaScale = new Vector2(1 + scale.X / sliderQuad.Width, 1 + scale.Y / sliderQuad.Height);
+            Vector2 pathRelativeDeltaScale = new Vector2(
+                sliderQuad.Width == 0 ? 0 : 1 + scale.X / sliderQuad.Width,
+                sliderQuad.Height == 0 ? 0 : 1 + scale.Y / sliderQuad.Height);
 
             Queue<Vector2> oldControlPoints = new Queue<Vector2>();
 
@@ -226,7 +228,7 @@ namespace osu.Game.Rulesets.Osu.Edit
             Quad scaledQuad = getSurroundingQuad(new OsuHitObject[] { slider });
             (bool xInBounds, bool yInBounds) = isQuadInBounds(scaledQuad);
 
-            if (xInBounds && yInBounds)
+            if (xInBounds && yInBounds && slider.Path.HasValidLength)
                 return;
 
             foreach (var point in slider.Path.ControlPoints)

osu.Game.Rulesets.Osu/Mods/OsuModBarrelRoll.cs

@@ -0,0 +1,44 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Configuration;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.UI;
+using osu.Game.Rulesets.UI;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Mods
+{
+    public class OsuModBarrelRoll : Mod, IUpdatableByPlayfield, IApplicableToDrawableRuleset<OsuHitObject>
+    {
+        [SettingSource("Roll speed", "Rotations per minute")]
+        public BindableNumber<double> SpinSpeed { get; } = new BindableDouble(0.5)
+        {
+            MinValue = 0.02,
+            MaxValue = 4,
+            Precision = 0.01,
+        };
+
+        [SettingSource("Direction", "The direction of rotation")]
+        public Bindable<RotationDirection> Direction { get; } = new Bindable<RotationDirection>(RotationDirection.Clockwise);
+
+        public override string Name => "Barrel Roll";
+        public override string Acronym => "BR";
+        public override string Description => "The whole playfield is on a wheel!";
+        public override double ScoreMultiplier => 1;
+
+        public void Update(Playfield playfield)
+        {
+            playfield.Rotation = (Direction.Value == RotationDirection.CounterClockwise ? -1 : 1) * 360 * (float)(playfield.Time.Current / 60000 * SpinSpeed.Value);
+        }
+
+        public void ApplyToDrawableRuleset(DrawableRuleset<OsuHitObject> drawableRuleset)
+        {
+            // scale the playfield to allow all hitobjects to stay within the visible region.
+            drawableRuleset.Playfield.Scale = new Vector2(OsuPlayfield.BASE_SIZE.Y / OsuPlayfield.BASE_SIZE.X);
+        }
+    }
+}

osu.Game.Rulesets.Osu/Mods/OsuModTouchDevice.cs

@@ -9,6 +9,7 @@ namespace osu.Game.Rulesets.Osu.Mods
     {
         public override string Name => "Touch Device";
         public override string Acronym => "TD";
+        public override string Description => "Automatically applied to plays on devices with a touchscreen.";
         public override double ScoreMultiplier => 1;
 
         public override ModType Type => ModType.System;

osu.Game.Rulesets.Osu/OsuRuleset.cs

@@ -185,6 +185,7 @@ namespace osu.Game.Rulesets.Osu
                         new MultiMod(new OsuModGrow(), new OsuModDeflate()),
                         new MultiMod(new ModWindUp(), new ModWindDown()),
                         new OsuModTraceable(),
+                        new OsuModBarrelRoll(),
                     };
 
                 case ModType.System:
@@ -206,6 +207,8 @@ namespace osu.Game.Rulesets.Osu
 
         public override HitObjectComposer CreateHitObjectComposer() => new OsuHitObjectComposer(this);
 
+        public override IBeatmapVerifier CreateBeatmapVerifier() => new OsuBeatmapVerifier();
+
         public override string Description => "osu!";
 
         public override string ShortName => SHORT_NAME;

osu.Game.Rulesets.Osu/Replays/OsuAutoGenerator.cs

@@ -71,8 +71,6 @@ namespace osu.Game.Rulesets.Osu.Replays
 
             buttonIndex = 0;
 
-            AddFrameToReplay(new OsuReplayFrame(-100000, new Vector2(256, 500)));
-            AddFrameToReplay(new OsuReplayFrame(Beatmap.HitObjects[0].StartTime - 1500, new Vector2(256, 500)));
             AddFrameToReplay(new OsuReplayFrame(Beatmap.HitObjects[0].StartTime - 1500, new Vector2(256, 500)));
 
             for (int i = 0; i < Beatmap.HitObjects.Count; i++)

osu.Game.Rulesets.Osu/Replays/OsuFramedReplayInputHandler.cs

@@ -2,13 +2,11 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using osu.Framework.Input.StateChanges;
 using osu.Framework.Utils;
 using osu.Game.Replays;
 using osu.Game.Rulesets.Replays;
-using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Replays
 {
@@ -21,24 +19,11 @@ namespace osu.Game.Rulesets.Osu.Replays
 
         protected override bool IsImportant(OsuReplayFrame frame) => frame.Actions.Any();
 
-        protected Vector2? Position
-        {
-            get
-            {
-                var frame = CurrentFrame;
-
-                if (frame == null)
-                    return null;
-
-                Debug.Assert(CurrentTime != null);
-
-                return NextFrame != null ? Interpolation.ValueAt(CurrentTime.Value, frame.Position, NextFrame.Position, frame.Time, NextFrame.Time) : frame.Position;
-            }
-        }
-
         public override void CollectPendingInputs(List<IInput> inputs)
         {
-            inputs.Add(new MousePositionAbsoluteInput { Position = GamefieldToScreenSpace(Position ?? Vector2.Zero) });
+            var position = Interpolation.ValueAt(CurrentTime, StartFrame.Position, EndFrame.Position, StartFrame.Time, EndFrame.Time);
+
+            inputs.Add(new MousePositionAbsoluteInput { Position = GamefieldToScreenSpace(position) });
             inputs.Add(new ReplayState<OsuAction> { PressedActions = CurrentFrame?.Actions ?? new List<OsuAction>() });
         }
     }

osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyCursor.cs

@@ -24,6 +24,7 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
         [BackgroundDependencyLoader]
         private void load(ISkinSource skin)
         {
+            bool centre = skin.GetConfig<OsuSkinConfiguration, bool>(OsuSkinConfiguration.CursorCentre)?.Value ?? true;
             spin = skin.GetConfig<OsuSkinConfiguration, bool>(OsuSkinConfiguration.CursorRotate)?.Value ?? true;
 
             InternalChildren = new[]
@@ -32,13 +33,13 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
                 {
                     Texture = skin.GetTexture("cursor"),
                     Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
+                    Origin = centre ? Anchor.Centre : Anchor.TopLeft,
                 },
                 new NonPlayfieldSprite
                 {
                     Texture = skin.GetTexture("cursormiddle"),
                     Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
+                    Origin = centre ? Anchor.Centre : Anchor.TopLeft,
                 },
             };
         }

osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyCursorTrail.cs

@@ -26,7 +26,17 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
             Texture = skin.GetTexture("cursortrail");
             disjointTrail = skin.GetTexture("cursormiddle") == null;
 
-            Blending = !disjointTrail ? BlendingParameters.Additive : BlendingParameters.Inherit;
+            if (disjointTrail)
+            {
+                bool centre = skin.GetConfig<OsuSkinConfiguration, bool>(OsuSkinConfiguration.CursorCentre)?.Value ?? true;
+
+                TrailOrigin = centre ? Anchor.Centre : Anchor.TopLeft;
+                Blending = BlendingParameters.Inherit;
+            }
+            else
+            {
+                Blending = BlendingParameters.Additive;
+            }
 
             if (Texture != null)
             {

osu.Game.Rulesets.Osu/Skinning/OsuSkinConfiguration.cs

@@ -8,6 +8,7 @@ namespace osu.Game.Rulesets.Osu.Skinning
         SliderBorderSize,
         SliderPathRadius,
         AllowSliderBallTint,
+        CursorCentre,
         CursorExpand,
         CursorRotate,
         HitCircleOverlayAboveNumber,

osu.Game.Rulesets.Osu/UI/Cursor/CursorTrail.cs

@@ -5,6 +5,7 @@ using System;
 using System.Diagnostics;
 using System.Runtime.InteropServices;
 using osu.Framework.Allocation;
+using osu.Framework.Extensions.EnumExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Batches;
 using osu.Framework.Graphics.OpenGL.Vertices;
@@ -31,6 +32,18 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
         private double timeOffset;
         private float time;
 
+        private Anchor trailOrigin = Anchor.Centre;
+
+        protected Anchor TrailOrigin
+        {
+            get => trailOrigin;
+            set
+            {
+                trailOrigin = value;
+                Invalidate(Invalidation.DrawNode);
+            }
+        }
+
         public CursorTrail()
         {
             // as we are currently very dependent on having a running clock, let's make our own clock for the time being.
@@ -197,6 +210,8 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
             private readonly TrailPart[] parts = new TrailPart[max_sprites];
             private Vector2 size;
 
+            private Vector2 originPosition;
+
             private readonly QuadBatch<TexturedTrailVertex> vertexBatch = new QuadBatch<TexturedTrailVertex>(max_sprites, 1);
 
             public TrailDrawNode(CursorTrail source)
@@ -213,6 +228,18 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
                 size = Source.partSize;
                 time = Source.time;
 
+                originPosition = Vector2.Zero;
+
+                if (Source.TrailOrigin.HasFlagFast(Anchor.x1))
+                    originPosition.X = 0.5f;
+                else if (Source.TrailOrigin.HasFlagFast(Anchor.x2))
+                    originPosition.X = 1f;
+
+                if (Source.TrailOrigin.HasFlagFast(Anchor.y1))
+                    originPosition.Y = 0.5f;
+                else if (Source.TrailOrigin.HasFlagFast(Anchor.y2))
+                    originPosition.Y = 1f;
+
                 Source.parts.CopyTo(parts, 0);
             }
 
@@ -237,7 +264,7 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
                     vertexBatch.Add(new TexturedTrailVertex
                     {
-                        Position = new Vector2(part.Position.X - size.X / 2, part.Position.Y + size.Y / 2),
+                        Position = new Vector2(part.Position.X - size.X * originPosition.X, part.Position.Y + size.Y * (1 - originPosition.Y)),
                         TexturePosition = textureRect.BottomLeft,
                         TextureRect = new Vector4(0, 0, 1, 1),
                         Colour = DrawColourInfo.Colour.BottomLeft.Linear,
@@ -246,7 +273,7 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
                     vertexBatch.Add(new TexturedTrailVertex
                     {
-                        Position = new Vector2(part.Position.X + size.X / 2, part.Position.Y + size.Y / 2),
+                        Position = new Vector2(part.Position.X + size.X * (1 - originPosition.X), part.Position.Y + size.Y * (1 - originPosition.Y)),
                         TexturePosition = textureRect.BottomRight,
                         TextureRect = new Vector4(0, 0, 1, 1),
                         Colour = DrawColourInfo.Colour.BottomRight.Linear,
@@ -255,7 +282,7 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
                     vertexBatch.Add(new TexturedTrailVertex
                     {
-                        Position = new Vector2(part.Position.X + size.X / 2, part.Position.Y - size.Y / 2),
+                        Position = new Vector2(part.Position.X + size.X * (1 - originPosition.X), part.Position.Y - size.Y * originPosition.Y),
                         TexturePosition = textureRect.TopRight,
                         TextureRect = new Vector4(0, 0, 1, 1),
                         Colour = DrawColourInfo.Colour.TopRight.Linear,
@@ -264,7 +291,7 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
                     vertexBatch.Add(new TexturedTrailVertex
                     {
-                        Position = new Vector2(part.Position.X - size.X / 2, part.Position.Y - size.Y / 2),
+                        Position = new Vector2(part.Position.X - size.X * originPosition.X, part.Position.Y - size.Y * originPosition.Y),
                         TexturePosition = textureRect.TopLeft,
                         TextureRect = new Vector4(0, 0, 1, 1),
                         Colour = DrawColourInfo.Colour.TopLeft.Linear,

osu.Game.Rulesets.Osu/UI/OsuPlayfield.cs

@@ -42,6 +42,9 @@ namespace osu.Game.Rulesets.Osu.UI
 
         public OsuPlayfield()
         {
+            Anchor = Anchor.Centre;
+            Origin = Anchor.Centre;
+
             InternalChildren = new Drawable[]
             {
                 playfieldBorder = new PlayfieldBorder { RelativeSizeAxes = Axes.Both },

osu.Game.Rulesets.Osu/UI/OsuResumeOverlay.cs

@@ -33,7 +33,6 @@ namespace osu.Game.Rulesets.Osu.UI
         {
             Add(cursorScaleContainer = new Container
             {
-                RelativePositionAxes = Axes.Both,
                 Child = clickToResumeCursor = new OsuClickToResumeCursor { ResumeRequested = Resume }
             });
         }

osu.Game.Rulesets.Taiko/Edit/Blueprints/TaikoSpanPlacementBlueprint.cs

@@ -72,7 +72,7 @@ namespace osu.Game.Rulesets.Taiko.Edit.Blueprints
         {
             base.UpdateTimeAndPosition(result);
 
-            if (PlacementActive)
+            if (PlacementActive == PlacementState.Active)
             {
                 if (result.Time is double dragTime)
                 {

osu.Game.Rulesets.Taiko/Replays/TaikoAutoGenerator.cs

@@ -35,7 +35,6 @@ namespace osu.Game.Rulesets.Taiko.Replays
 
             bool hitButton = true;
 
-            Frames.Add(new TaikoReplayFrame(-100000));
             Frames.Add(new TaikoReplayFrame(Beatmap.HitObjects[0].StartTime - 1000));
 
             for (int i = 0; i < Beatmap.HitObjects.Count; i++)

osu.Game.Tests/Editing/Checks/CheckBackgroundTest.cs

@@ -0,0 +1,67 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Tests.Editing.Checks
+{
+    [TestFixture]
+    public class CheckBackgroundTest
+    {
+        private CheckBackground check;
+        private IBeatmap beatmap;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckBackground();
+            beatmap = new Beatmap<HitObject>
+            {
+                BeatmapInfo = new BeatmapInfo
+                {
+                    Metadata = new BeatmapMetadata { BackgroundFile = "abc123.jpg" },
+                    BeatmapSet = new BeatmapSetInfo
+                    {
+                        Files = new List<BeatmapSetFileInfo>(new[]
+                        {
+                            new BeatmapSetFileInfo { Filename = "abc123.jpg" }
+                        })
+                    }
+                }
+            };
+        }
+
+        [Test]
+        public void TestBackgroundSetAndInFiles()
+        {
+            Assert.That(check.Run(beatmap), Is.Empty);
+        }
+
+        [Test]
+        public void TestBackgroundSetAndNotInFiles()
+        {
+            beatmap.BeatmapInfo.BeatmapSet.Files.Clear();
+
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckBackground.IssueTemplateDoesNotExist);
+        }
+
+        [Test]
+        public void TestBackgroundNotSet()
+        {
+            beatmap.Metadata.BackgroundFile = null;
+
+            var issues = check.Run(beatmap).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.Single().Template is CheckBackground.IssueTemplateNoneSet);
+        }
+    }
+}

osu.Game.Tests/NonVisual/DifficultyAdjustmentModCombinationsTest.cs

@@ -144,6 +144,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => nameof(ModA);
             public override string Acronym => nameof(ModA);
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
 
             public override Type[] IncompatibleMods => new[] { typeof(ModIncompatibleWithA), typeof(ModIncompatibleWithAAndB) };
@@ -152,6 +153,7 @@ namespace osu.Game.Tests.NonVisual
         private class ModB : Mod
         {
             public override string Name => nameof(ModB);
+            public override string Description => string.Empty;
             public override string Acronym => nameof(ModB);
             public override double ScoreMultiplier => 1;
 
@@ -162,6 +164,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => nameof(ModC);
             public override string Acronym => nameof(ModC);
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
         }
 
@@ -169,6 +172,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => $"Incompatible With {nameof(ModA)}";
             public override string Acronym => $"Incompatible With {nameof(ModA)}";
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
 
             public override Type[] IncompatibleMods => new[] { typeof(ModA) };
@@ -187,6 +191,7 @@ namespace osu.Game.Tests.NonVisual
         {
             public override string Name => $"Incompatible With {nameof(ModA)} and {nameof(ModB)}";
             public override string Acronym => $"Incompatible With {nameof(ModA)} and {nameof(ModB)}";
+            public override string Description => string.Empty;
             public override double ScoreMultiplier => 1;
 
             public override Type[] IncompatibleMods => new[] { typeof(ModA), typeof(ModB) };

osu.Game.Tests/NonVisual/FramedReplayInputHandlerTest.cs

@@ -20,27 +20,14 @@ namespace osu.Game.Tests.NonVisual
         {
             handler = new TestInputHandler(replay = new Replay
             {
-                Frames = new List<ReplayFrame>
-                {
-                    new TestReplayFrame(0),
-                    new TestReplayFrame(1000),
-                    new TestReplayFrame(2000),
-                    new TestReplayFrame(3000, true),
-                    new TestReplayFrame(4000, true),
-                    new TestReplayFrame(5000, true),
-                    new TestReplayFrame(7000, true),
-                    new TestReplayFrame(8000),
-                }
+                HasReceivedAllFrames = false
             });
         }
 
         [Test]
         public void TestNormalPlayback()
         {
-            Assert.IsNull(handler.CurrentFrame);
-
-            confirmCurrentFrame(null);
-            confirmNextFrame(0);
+            setReplayFrames();
 
             setTime(0, 0);
             confirmCurrentFrame(0);
@@ -107,6 +94,8 @@ namespace osu.Game.Tests.NonVisual
         [Test]
         public void TestIntroTime()
         {
+            setReplayFrames();
+
             setTime(-1000, -1000);
             confirmCurrentFrame(null);
             confirmNextFrame(0);
@@ -123,6 +112,8 @@ namespace osu.Game.Tests.NonVisual
         [Test]
         public void TestBasicRewind()
         {
+            setReplayFrames();
+
             setTime(2800, 0);
             setTime(2800, 1000);
             setTime(2800, 2000);
@@ -133,34 +124,35 @@ namespace osu.Game.Tests.NonVisual
             // pivot without crossing a frame boundary
             setTime(2700, 2700);
             confirmCurrentFrame(2);
-            confirmNextFrame(1);
+            confirmNextFrame(3);
 
-            // cross current frame boundary; should not yet update frame
-            setTime(1980, 1980);
+            // cross current frame boundary
+            setTime(1980, 2000);
             confirmCurrentFrame(2);
-            confirmNextFrame(1);
+            confirmNextFrame(3);
 
             setTime(1200, 1200);
-            confirmCurrentFrame(2);
-            confirmNextFrame(1);
+            confirmCurrentFrame(1);
+            confirmNextFrame(2);
 
             // ensure each frame plays out until start
             setTime(-500, 1000);
             confirmCurrentFrame(1);
-            confirmNextFrame(0);
+            confirmNextFrame(2);
 
             setTime(-500, 0);
             confirmCurrentFrame(0);
-            confirmNextFrame(null);
+            confirmNextFrame(1);
 
             setTime(-500, -500);
-            confirmCurrentFrame(0);
-            confirmNextFrame(null);
+            confirmCurrentFrame(null);
+            confirmNextFrame(0);
         }
 
         [Test]
         public void TestRewindInsideImportantSection()
         {
+            setReplayFrames();
             fastForwardToPoint(3000);
 
             setTime(4000, 4000);
@@ -168,12 +160,12 @@ namespace osu.Game.Tests.NonVisual
             confirmNextFrame(5);
 
             setTime(3500, null);
-            confirmCurrentFrame(4);
-            confirmNextFrame(3);
+            confirmCurrentFrame(3);
+            confirmNextFrame(4);
 
             setTime(3000, 3000);
             confirmCurrentFrame(3);
-            confirmNextFrame(2);
+            confirmNextFrame(4);
 
             setTime(3500, null);
             confirmCurrentFrame(3);
@@ -187,46 +179,127 @@ namespace osu.Game.Tests.NonVisual
             confirmCurrentFrame(4);
             confirmNextFrame(5);
 
-            setTime(4000, null);
+            setTime(4000, 4000);
             confirmCurrentFrame(4);
             confirmNextFrame(5);
 
             setTime(3500, null);
-            confirmCurrentFrame(4);
-            confirmNextFrame(3);
+            confirmCurrentFrame(3);
+            confirmNextFrame(4);
 
             setTime(3000, 3000);
             confirmCurrentFrame(3);
-            confirmNextFrame(2);
+            confirmNextFrame(4);
         }
 
         [Test]
         public void TestRewindOutOfImportantSection()
         {
+            setReplayFrames();
             fastForwardToPoint(3500);
 
             confirmCurrentFrame(3);
             confirmNextFrame(4);
 
             setTime(3200, null);
-            // next frame doesn't change even though direction reversed, because of important section.
             confirmCurrentFrame(3);
             confirmNextFrame(4);
 
-            setTime(3000, null);
+            setTime(3000, 3000);
             confirmCurrentFrame(3);
             confirmNextFrame(4);
 
             setTime(2800, 2800);
-            confirmCurrentFrame(3);
-            confirmNextFrame(2);
+            confirmCurrentFrame(2);
+            confirmNextFrame(3);
+        }
+
+        [Test]
+        public void TestReplayStreaming()
+        {
+            // no frames are arrived yet
+            setTime(0, null);
+            setTime(1000, null);
+            Assert.IsTrue(handler.WaitingForFrame, "Should be waiting for the first frame");
+
+            replay.Frames.Add(new TestReplayFrame(0));
+            replay.Frames.Add(new TestReplayFrame(1000));
+
+            // should always play from beginning
+            setTime(1000, 0);
+            confirmCurrentFrame(0);
+            Assert.IsFalse(handler.WaitingForFrame, "Should not be waiting yet");
+            setTime(1000, 1000);
+            confirmCurrentFrame(1);
+            confirmNextFrame(null);
+            Assert.IsTrue(handler.WaitingForFrame, "Should be waiting");
+
+            // cannot seek beyond the last frame
+            setTime(1500, null);
+            confirmCurrentFrame(1);
+
+            setTime(-100, 0);
+            confirmCurrentFrame(0);
+
+            // can seek to the point before the first frame, however
+            setTime(-100, -100);
+            confirmCurrentFrame(null);
+            confirmNextFrame(0);
+
+            fastForwardToPoint(1000);
+            setTime(3000, null);
+            replay.Frames.Add(new TestReplayFrame(2000));
+            confirmCurrentFrame(1);
+            setTime(1000, 1000);
+            setTime(3000, 2000);
+        }
+
+        [Test]
+        public void TestMultipleFramesSameTime()
+        {
+            replay.Frames.Add(new TestReplayFrame(0));
+            replay.Frames.Add(new TestReplayFrame(0));
+            replay.Frames.Add(new TestReplayFrame(1000));
+            replay.Frames.Add(new TestReplayFrame(1000));
+            replay.Frames.Add(new TestReplayFrame(2000));
+
+            // forward direction is prioritized when multiple frames have the same time.
+            setTime(0, 0);
+            setTime(0, 0);
+
+            setTime(2000, 1000);
+            setTime(2000, 1000);
+
+            setTime(1000, 1000);
+            setTime(1000, 1000);
+            setTime(-100, 1000);
+            setTime(-100, 0);
+            setTime(-100, 0);
+            setTime(-100, -100);
+        }
+
+        private void setReplayFrames()
+        {
+            replay.Frames = new List<ReplayFrame>
+            {
+                new TestReplayFrame(0),
+                new TestReplayFrame(1000),
+                new TestReplayFrame(2000),
+                new TestReplayFrame(3000, true),
+                new TestReplayFrame(4000, true),
+                new TestReplayFrame(5000, true),
+                new TestReplayFrame(7000, true),
+                new TestReplayFrame(8000),
+            };
+            replay.HasReceivedAllFrames = true;
         }
 
         private void fastForwardToPoint(double destination)
         {
             for (int i = 0; i < 1000; i++)
             {
-                if (handler.SetFrameFromTime(destination) == null)
+                var time = handler.SetFrameFromTime(destination);
+                if (time == null || time == destination)
                     return;
             }
 
@@ -235,33 +308,17 @@ namespace osu.Game.Tests.NonVisual
 
         private void setTime(double set, double? expect)
         {
-            Assert.AreEqual(expect, handler.SetFrameFromTime(set));
+            Assert.AreEqual(expect, handler.SetFrameFromTime(set), "Unexpected return value");
         }
 
         private void confirmCurrentFrame(int? frame)
         {
-            if (frame.HasValue)
-            {
-                Assert.IsNotNull(handler.CurrentFrame);
-                Assert.AreEqual(replay.Frames[frame.Value].Time, handler.CurrentFrame.Time);
-            }
-            else
-            {
-                Assert.IsNull(handler.CurrentFrame);
-            }
+            Assert.AreEqual(frame is int x ? replay.Frames[x].Time : (double?)null, handler.CurrentFrame?.Time, "Unexpected current frame");
         }
 
         private void confirmNextFrame(int? frame)
         {
-            if (frame.HasValue)
-            {
-                Assert.IsNotNull(handler.NextFrame);
-                Assert.AreEqual(replay.Frames[frame.Value].Time, handler.NextFrame.Time);
-            }
-            else
-            {
-                Assert.IsNull(handler.NextFrame);
-            }
+            Assert.AreEqual(frame is int x ? replay.Frames[x].Time : (double?)null, handler.NextFrame?.Time, "Unexpected next frame");
         }
 
         private class TestReplayFrame : ReplayFrame

osu.Game.Tests/NonVisual/StreamingFramedReplayInputHandlerTest.cs

@@ -1,296 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using System;
-using System.Collections.Generic;
-using NUnit.Framework;
-using osu.Game.Replays;
-using osu.Game.Rulesets.Replays;
-
-namespace osu.Game.Tests.NonVisual
-{
-    [TestFixture]
-    public class StreamingFramedReplayInputHandlerTest
-    {
-        private Replay replay;
-        private TestInputHandler handler;
-
-        [SetUp]
-        public void SetUp()
-        {
-            handler = new TestInputHandler(replay = new Replay
-            {
-                HasReceivedAllFrames = false,
-                Frames = new List<ReplayFrame>
-                {
-                    new TestReplayFrame(0),
-                    new TestReplayFrame(1000),
-                    new TestReplayFrame(2000),
-                    new TestReplayFrame(3000, true),
-                    new TestReplayFrame(4000, true),
-                    new TestReplayFrame(5000, true),
-                    new TestReplayFrame(7000, true),
-                    new TestReplayFrame(8000),
-                }
-            });
-        }
-
-        [Test]
-        public void TestNormalPlayback()
-        {
-            Assert.IsNull(handler.CurrentFrame);
-
-            confirmCurrentFrame(null);
-            confirmNextFrame(0);
-
-            setTime(0, 0);
-            confirmCurrentFrame(0);
-            confirmNextFrame(1);
-
-            // if we hit the first frame perfectly, time should progress to it.
-            setTime(1000, 1000);
-            confirmCurrentFrame(1);
-            confirmNextFrame(2);
-
-            // in between non-important frames should progress based on input.
-            setTime(1200, 1200);
-            confirmCurrentFrame(1);
-
-            setTime(1400, 1400);
-            confirmCurrentFrame(1);
-
-            // progressing beyond the next frame should force time to that frame once.
-            setTime(2200, 2000);
-            confirmCurrentFrame(2);
-
-            // second attempt should progress to input time
-            setTime(2200, 2200);
-            confirmCurrentFrame(2);
-
-            // entering important section
-            setTime(3000, 3000);
-            confirmCurrentFrame(3);
-
-            // cannot progress within
-            setTime(3500, null);
-            confirmCurrentFrame(3);
-
-            setTime(4000, 4000);
-            confirmCurrentFrame(4);
-
-            // still cannot progress
-            setTime(4500, null);
-            confirmCurrentFrame(4);
-
-            setTime(5200, 5000);
-            confirmCurrentFrame(5);
-
-            // important section AllowedImportantTimeSpan allowance
-            setTime(5200, 5200);
-            confirmCurrentFrame(5);
-
-            setTime(7200, 7000);
-            confirmCurrentFrame(6);
-
-            setTime(7200, null);
-            confirmCurrentFrame(6);
-
-            // exited important section
-            setTime(8200, 8000);
-            confirmCurrentFrame(7);
-            confirmNextFrame(null);
-
-            setTime(8200, null);
-            confirmCurrentFrame(7);
-            confirmNextFrame(null);
-
-            setTime(8400, null);
-            confirmCurrentFrame(7);
-            confirmNextFrame(null);
-        }
-
-        [Test]
-        public void TestIntroTime()
-        {
-            setTime(-1000, -1000);
-            confirmCurrentFrame(null);
-            confirmNextFrame(0);
-
-            setTime(-500, -500);
-            confirmCurrentFrame(null);
-            confirmNextFrame(0);
-
-            setTime(0, 0);
-            confirmCurrentFrame(0);
-            confirmNextFrame(1);
-        }
-
-        [Test]
-        public void TestBasicRewind()
-        {
-            setTime(2800, 0);
-            setTime(2800, 1000);
-            setTime(2800, 2000);
-            setTime(2800, 2800);
-            confirmCurrentFrame(2);
-            confirmNextFrame(3);
-
-            // pivot without crossing a frame boundary
-            setTime(2700, 2700);
-            confirmCurrentFrame(2);
-            confirmNextFrame(1);
-
-            // cross current frame boundary; should not yet update frame
-            setTime(1980, 1980);
-            confirmCurrentFrame(2);
-            confirmNextFrame(1);
-
-            setTime(1200, 1200);
-            confirmCurrentFrame(2);
-            confirmNextFrame(1);
-
-            // ensure each frame plays out until start
-            setTime(-500, 1000);
-            confirmCurrentFrame(1);
-            confirmNextFrame(0);
-
-            setTime(-500, 0);
-            confirmCurrentFrame(0);
-            confirmNextFrame(null);
-
-            setTime(-500, -500);
-            confirmCurrentFrame(0);
-            confirmNextFrame(null);
-        }
-
-        [Test]
-        public void TestRewindInsideImportantSection()
-        {
-            fastForwardToPoint(3000);
-
-            setTime(4000, 4000);
-            confirmCurrentFrame(4);
-            confirmNextFrame(5);
-
-            setTime(3500, null);
-            confirmCurrentFrame(4);
-            confirmNextFrame(3);
-
-            setTime(3000, 3000);
-            confirmCurrentFrame(3);
-            confirmNextFrame(2);
-
-            setTime(3500, null);
-            confirmCurrentFrame(3);
-            confirmNextFrame(4);
-
-            setTime(4000, 4000);
-            confirmCurrentFrame(4);
-            confirmNextFrame(5);
-
-            setTime(4500, null);
-            confirmCurrentFrame(4);
-            confirmNextFrame(5);
-
-            setTime(4000, null);
-            confirmCurrentFrame(4);
-            confirmNextFrame(5);
-
-            setTime(3500, null);
-            confirmCurrentFrame(4);
-            confirmNextFrame(3);
-
-            setTime(3000, 3000);
-            confirmCurrentFrame(3);
-            confirmNextFrame(2);
-        }
-
-        [Test]
-        public void TestRewindOutOfImportantSection()
-        {
-            fastForwardToPoint(3500);
-
-            confirmCurrentFrame(3);
-            confirmNextFrame(4);
-
-            setTime(3200, null);
-            // next frame doesn't change even though direction reversed, because of important section.
-            confirmCurrentFrame(3);
-            confirmNextFrame(4);
-
-            setTime(3000, null);
-            confirmCurrentFrame(3);
-            confirmNextFrame(4);
-
-            setTime(2800, 2800);
-            confirmCurrentFrame(3);
-            confirmNextFrame(2);
-        }
-
-        private void fastForwardToPoint(double destination)
-        {
-            for (int i = 0; i < 1000; i++)
-            {
-                if (handler.SetFrameFromTime(destination) == null)
-                    return;
-            }
-
-            throw new TimeoutException("Seek was never fulfilled");
-        }
-
-        private void setTime(double set, double? expect)
-        {
-            Assert.AreEqual(expect, handler.SetFrameFromTime(set));
-        }
-
-        private void confirmCurrentFrame(int? frame)
-        {
-            if (frame.HasValue)
-            {
-                Assert.IsNotNull(handler.CurrentFrame);
-                Assert.AreEqual(replay.Frames[frame.Value].Time, handler.CurrentFrame.Time);
-            }
-            else
-            {
-                Assert.IsNull(handler.CurrentFrame);
-            }
-        }
-
-        private void confirmNextFrame(int? frame)
-        {
-            if (frame.HasValue)
-            {
-                Assert.IsNotNull(handler.NextFrame);
-                Assert.AreEqual(replay.Frames[frame.Value].Time, handler.NextFrame.Time);
-            }
-            else
-            {
-                Assert.IsNull(handler.NextFrame);
-            }
-        }
-
-        private class TestReplayFrame : ReplayFrame
-        {
-            public readonly bool IsImportant;
-
-            public TestReplayFrame(double time, bool isImportant = false)
-                : base(time)
-            {
-                IsImportant = isImportant;
-            }
-        }
-
-        private class TestInputHandler : FramedReplayInputHandler<TestReplayFrame>
-        {
-            public TestInputHandler(Replay replay)
-                : base(replay)
-            {
-                FrameAccuratePlayback = true;
-            }
-
-            protected override double AllowedImportantTimeSpan => 1000;
-
-            protected override bool IsImportant(TestReplayFrame frame) => frame.IsImportant;
-        }
-    }
-}

osu.Game.Tests/Online/TestAPIModJsonSerialization.cs

@@ -140,6 +140,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TM";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Test")]
@@ -156,6 +157,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TMTR";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Initial rate", "The starting speed of the track")]

osu.Game.Tests/Online/TestAPIModMessagePackSerialization.cs

@@ -100,6 +100,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TM";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Test")]
@@ -116,6 +117,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TMTR";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Initial rate", "The starting speed of the track")]
@@ -150,6 +152,7 @@ namespace osu.Game.Tests.Online
         {
             public override string Name => "Test Mod";
             public override string Acronym => "TM";
+            public override string Description => "This is a test mod.";
             public override double ScoreMultiplier => 1;
 
             [SettingSource("Test")]

osu.Game.Tests/Visual/Background/TestSceneUserDimBackgrounds.cs

@@ -65,6 +65,21 @@ namespace osu.Game.Tests.Visual.Background
             stack.Push(songSelect = new DummySongSelect());
         });
 
+        /// <summary>
+        /// User settings should always be ignored on song select screen.
+        /// </summary>
+        [Test]
+        public void TestUserSettingsIgnoredOnSongSelect()
+        {
+            setupUserSettings();
+            AddUntilStep("Screen is undimmed", () => songSelect.IsBackgroundUndimmed());
+            AddUntilStep("Screen using background blur", () => songSelect.IsBackgroundBlur());
+            performFullSetup();
+            AddStep("Exit to song select", () => player.Exit());
+            AddUntilStep("Screen is undimmed", () => songSelect.IsBackgroundUndimmed());
+            AddUntilStep("Screen using background blur", () => songSelect.IsBackgroundBlur());
+        }
+
         /// <summary>
         /// Check if <see cref="PlayerLoader"/> properly triggers the visual settings preview when a user hovers over the visual settings panel.
         /// </summary>
@@ -142,9 +157,9 @@ namespace osu.Game.Tests.Visual.Background
         {
             performFullSetup();
             AddUntilStep("Screen is dimmed and blur applied", () => songSelect.IsBackgroundDimmed() && songSelect.IsUserBlurApplied());
-            AddStep("Enable user dim", () => songSelect.DimEnabled.Value = false);
+            AddStep("Disable user dim", () => songSelect.IgnoreUserSettings.Value = true);
             AddUntilStep("Screen is undimmed and user blur removed", () => songSelect.IsBackgroundUndimmed() && songSelect.IsUserBlurDisabled());
-            AddStep("Disable user dim", () => songSelect.DimEnabled.Value = true);
+            AddStep("Enable user dim", () => songSelect.IgnoreUserSettings.Value = false);
             AddUntilStep("Screen is dimmed and blur applied", () => songSelect.IsBackgroundDimmed() && songSelect.IsUserBlurApplied());
         }
 
@@ -161,13 +176,36 @@ namespace osu.Game.Tests.Visual.Background
                 player.ReplacesBackground.Value = true;
                 player.StoryboardEnabled.Value = true;
             });
-            AddStep("Enable user dim", () => player.DimmableStoryboard.EnableUserDim.Value = true);
+            AddStep("Enable user dim", () => player.DimmableStoryboard.IgnoreUserSettings.Value = false);
             AddStep("Set dim level to 1", () => songSelect.DimLevel.Value = 1f);
             AddUntilStep("Storyboard is invisible", () => !player.IsStoryboardVisible);
-            AddStep("Disable user dim", () => player.DimmableStoryboard.EnableUserDim.Value = false);
+            AddStep("Disable user dim", () => player.DimmableStoryboard.IgnoreUserSettings.Value = true);
             AddUntilStep("Storyboard is visible", () => player.IsStoryboardVisible);
         }
 
+        [Test]
+        public void TestStoryboardIgnoreUserSettings()
+        {
+            performFullSetup();
+            createFakeStoryboard();
+            AddStep("Enable replacing background", () => player.ReplacesBackground.Value = true);
+
+            AddUntilStep("Storyboard is invisible", () => !player.IsStoryboardVisible);
+            AddUntilStep("Background is visible", () => songSelect.IsBackgroundVisible());
+
+            AddStep("Ignore user settings", () =>
+            {
+                player.ApplyToBackground(b => b.IgnoreUserSettings.Value = true);
+                player.DimmableStoryboard.IgnoreUserSettings.Value = true;
+            });
+            AddUntilStep("Storyboard is visible", () => player.IsStoryboardVisible);
+            AddUntilStep("Background is invisible", () => songSelect.IsBackgroundInvisible());
+
+            AddStep("Disable background replacement", () => player.ReplacesBackground.Value = false);
+            AddUntilStep("Storyboard is visible", () => player.IsStoryboardVisible);
+            AddUntilStep("Background is visible", () => songSelect.IsBackgroundVisible());
+        }
+
         /// <summary>
         /// Check if the visual settings container retains dim and blur when pausing
         /// </summary>
@@ -204,17 +242,6 @@ namespace osu.Game.Tests.Visual.Background
                 songSelect.IsBackgroundUndimmed() && songSelect.IsBackgroundCurrent() && songSelect.CheckBackgroundBlur(results.ExpectedBackgroundBlur));
         }
 
-        /// <summary>
-        /// Check if background gets undimmed and unblurred when leaving <see cref="Player"/>  for <see cref="PlaySongSelect"/>
-        /// </summary>
-        [Test]
-        public void TestTransitionOut()
-        {
-            performFullSetup();
-            AddStep("Exit to song select", () => player.Exit());
-            AddUntilStep("Screen is undimmed and user blur removed", () => songSelect.IsBackgroundUndimmed() && songSelect.IsBlurCorrect());
-        }
-
         /// <summary>
         /// Check if hovering on the visual settings dialogue after resuming from player still previews the background dim.
         /// </summary>
@@ -281,11 +308,11 @@ namespace osu.Game.Tests.Visual.Background
             protected override BackgroundScreen CreateBackground()
             {
                 background = new FadeAccessibleBackground(Beatmap.Value);
-                DimEnabled.BindTo(background.EnableUserDim);
+                IgnoreUserSettings.BindTo(background.IgnoreUserSettings);
                 return background;
             }
 
-            public readonly Bindable<bool> DimEnabled = new Bindable<bool>();
+            public readonly Bindable<bool> IgnoreUserSettings = new Bindable<bool>();
             public readonly Bindable<double> DimLevel = new BindableDouble();
             public readonly Bindable<double> BlurLevel = new BindableDouble();
 
@@ -310,7 +337,7 @@ namespace osu.Game.Tests.Visual.Background
 
             public bool IsBackgroundVisible() => background.CurrentAlpha == 1;
 
-            public bool IsBlurCorrect() => background.CurrentBlur == new Vector2(BACKGROUND_BLUR);
+            public bool IsBackgroundBlur() => background.CurrentBlur == new Vector2(BACKGROUND_BLUR);
 
             public bool CheckBackgroundBlur(Vector2 expected) => background.CurrentBlur == expected;
 

osu.Game.Tests/Visual/Editing/TestSceneEditorQuickDelete.cs

@@ -1,88 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using System.Linq;
-using NUnit.Framework;
-using osu.Framework.Testing;
-using osu.Game.Beatmaps;
-using osu.Game.Rulesets;
-using osu.Game.Rulesets.Objects;
-using osu.Game.Rulesets.Osu;
-using osu.Game.Rulesets.Osu.Objects;
-using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles.Components;
-using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components;
-using osu.Game.Tests.Beatmaps;
-using osu.Game.Screens.Edit.Compose.Components;
-using osuTK;
-using osuTK.Input;
-
-namespace osu.Game.Tests.Visual.Editing
-{
-    public class TestSceneEditorQuickDelete : EditorTestScene
-    {
-        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
-
-        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(ruleset, false);
-
-        private BlueprintContainer blueprintContainer
-            => Editor.ChildrenOfType<BlueprintContainer>().First();
-
-        [Test]
-        public void TestQuickDeleteRemovesObject()
-        {
-            var addedObject = new HitCircle { StartTime = 1000 };
-
-            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
-
-            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));
-
-            AddStep("move mouse to object", () =>
-            {
-                var pos = blueprintContainer.ChildrenOfType<HitCirclePiece>().First().ScreenSpaceDrawQuad.Centre;
-                InputManager.MoveMouseTo(pos);
-            });
-            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
-            AddStep("right click", () => InputManager.Click(MouseButton.Right));
-            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
-
-            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
-        }
-
-        [Test]
-        public void TestQuickDeleteRemovesSliderControlPoint()
-        {
-            Slider slider = new Slider { StartTime = 1000 };
-
-            PathControlPoint[] points =
-            {
-                new PathControlPoint(),
-                new PathControlPoint(new Vector2(50, 0)),
-                new PathControlPoint(new Vector2(100, 0))
-            };
-
-            AddStep("add slider", () =>
-            {
-                slider.Path = new SliderPath(points);
-                EditorBeatmap.Add(slider);
-            });
-
-            AddStep("select added slider", () => EditorBeatmap.SelectedHitObjects.Add(slider));
-
-            AddStep("move mouse to controlpoint", () =>
-            {
-                var pos = blueprintContainer.ChildrenOfType<PathControlPointPiece>().ElementAt(1).ScreenSpaceDrawQuad.Centre;
-                InputManager.MoveMouseTo(pos);
-            });
-            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
-
-            AddStep("right click", () => InputManager.Click(MouseButton.Right));
-            AddAssert("slider has 2 points", () => slider.Path.ControlPoints.Count == 2);
-
-            // second click should nuke the object completely.
-            AddStep("right click", () => InputManager.Click(MouseButton.Right));
-            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
-
-            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
-        }
-    }
-}

osu.Game.Tests/Visual/Editing/TestSceneEditorSelection.cs

@@ -0,0 +1,219 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Osu;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles.Components;
+using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components;
+using osu.Game.Tests.Beatmaps;
+using osu.Game.Screens.Edit.Compose.Components;
+using osuTK;
+using osuTK.Input;
+
+namespace osu.Game.Tests.Visual.Editing
+{
+    public class TestSceneEditorSelection : EditorTestScene
+    {
+        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
+
+        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(ruleset, false);
+
+        private BlueprintContainer blueprintContainer
+            => Editor.ChildrenOfType<BlueprintContainer>().First();
+
+        private void moveMouseToObject(Func<HitObject> targetFunc)
+        {
+            AddStep("move mouse to object", () =>
+            {
+                var pos = blueprintContainer.SelectionBlueprints
+                                            .First(s => s.HitObject == targetFunc())
+                                            .ChildrenOfType<HitCirclePiece>()
+                                            .First().ScreenSpaceDrawQuad.Centre;
+
+                InputManager.MoveMouseTo(pos);
+            });
+        }
+
+        [Test]
+        public void TestBasicSelect()
+        {
+            var addedObject = new HitCircle { StartTime = 100 };
+            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
+
+            moveMouseToObject(() => addedObject);
+            AddStep("left click", () => InputManager.Click(MouseButton.Left));
+
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject);
+
+            var addedObject2 = new HitCircle
+            {
+                StartTime = 100,
+                Position = new Vector2(100),
+            };
+
+            AddStep("add one more hitobject", () => EditorBeatmap.Add(addedObject2));
+            AddAssert("selection unchanged", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject);
+
+            moveMouseToObject(() => addedObject2);
+            AddStep("left click", () => InputManager.Click(MouseButton.Left));
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject2);
+        }
+
+        [Test]
+        public void TestMultiSelect()
+        {
+            var addedObjects = new[]
+            {
+                new HitCircle { StartTime = 100 },
+                new HitCircle { StartTime = 200, Position = new Vector2(50) },
+                new HitCircle { StartTime = 300, Position = new Vector2(100) },
+                new HitCircle { StartTime = 400, Position = new Vector2(150) },
+            };
+
+            AddStep("add hitobjects", () => EditorBeatmap.AddRange(addedObjects));
+
+            moveMouseToObject(() => addedObjects[0]);
+            AddStep("click first", () => InputManager.Click(MouseButton.Left));
+
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObjects[0]);
+
+            AddStep("hold control", () => InputManager.PressKey(Key.ControlLeft));
+
+            moveMouseToObject(() => addedObjects[1]);
+            AddStep("click second", () => InputManager.Click(MouseButton.Left));
+            AddAssert("2 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 2 && EditorBeatmap.SelectedHitObjects.Contains(addedObjects[1]));
+
+            moveMouseToObject(() => addedObjects[2]);
+            AddStep("click third", () => InputManager.Click(MouseButton.Left));
+            AddAssert("3 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 3 && EditorBeatmap.SelectedHitObjects.Contains(addedObjects[2]));
+
+            moveMouseToObject(() => addedObjects[1]);
+            AddStep("click second", () => InputManager.Click(MouseButton.Left));
+            AddAssert("2 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 2 && !EditorBeatmap.SelectedHitObjects.Contains(addedObjects[1]));
+        }
+
+        [TestCase(false)]
+        [TestCase(true)]
+        public void TestMultiSelectFromDrag(bool alreadySelectedBeforeDrag)
+        {
+            HitCircle[] addedObjects = null;
+
+            AddStep("add hitobjects", () => EditorBeatmap.AddRange(addedObjects = new[]
+            {
+                new HitCircle { StartTime = 100 },
+                new HitCircle { StartTime = 200, Position = new Vector2(50) },
+                new HitCircle { StartTime = 300, Position = new Vector2(100) },
+                new HitCircle { StartTime = 400, Position = new Vector2(150) },
+            }));
+
+            moveMouseToObject(() => addedObjects[0]);
+            AddStep("click first", () => InputManager.Click(MouseButton.Left));
+
+            AddStep("hold control", () => InputManager.PressKey(Key.ControlLeft));
+
+            moveMouseToObject(() => addedObjects[1]);
+
+            if (alreadySelectedBeforeDrag)
+                AddStep("click second", () => InputManager.Click(MouseButton.Left));
+
+            AddStep("mouse down on second", () => InputManager.PressButton(MouseButton.Left));
+
+            AddAssert("2 hitobjects selected", () => EditorBeatmap.SelectedHitObjects.Count == 2 && EditorBeatmap.SelectedHitObjects.Contains(addedObjects[1]));
+
+            AddStep("drag to centre", () => InputManager.MoveMouseTo(blueprintContainer.ScreenSpaceDrawQuad.Centre));
+
+            AddAssert("positions changed", () => addedObjects[0].Position != Vector2.Zero && addedObjects[1].Position != new Vector2(50));
+
+            AddStep("release control", () => InputManager.ReleaseKey(Key.ControlLeft));
+            AddStep("mouse up", () => InputManager.ReleaseButton(MouseButton.Left));
+        }
+
+        [Test]
+        public void TestBasicDeselect()
+        {
+            var addedObject = new HitCircle { StartTime = 100 };
+            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
+
+            moveMouseToObject(() => addedObject);
+            AddStep("left click", () => InputManager.Click(MouseButton.Left));
+
+            AddAssert("hitobject selected", () => EditorBeatmap.SelectedHitObjects.Single() == addedObject);
+
+            AddStep("click away", () =>
+            {
+                InputManager.MoveMouseTo(blueprintContainer.ScreenSpaceDrawQuad.Centre);
+                InputManager.Click(MouseButton.Left);
+            });
+
+            AddAssert("selection lost", () => EditorBeatmap.SelectedHitObjects.Count == 0);
+        }
+
+        [Test]
+        public void TestQuickDeleteRemovesObject()
+        {
+            var addedObject = new HitCircle { StartTime = 1000 };
+
+            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
+
+            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));
+
+            moveMouseToObject(() => addedObject);
+
+            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
+            AddStep("right click", () => InputManager.Click(MouseButton.Right));
+            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
+
+            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
+        }
+
+        [Test]
+        public void TestQuickDeleteRemovesSliderControlPoint()
+        {
+            Slider slider = null;
+
+            PathControlPoint[] points =
+            {
+                new PathControlPoint(),
+                new PathControlPoint(new Vector2(50, 0)),
+                new PathControlPoint(new Vector2(100, 0))
+            };
+
+            AddStep("add slider", () =>
+            {
+                slider = new Slider
+                {
+                    StartTime = 1000,
+                    Path = new SliderPath(points)
+                };
+
+                EditorBeatmap.Add(slider);
+            });
+
+            AddStep("select added slider", () => EditorBeatmap.SelectedHitObjects.Add(slider));
+
+            AddStep("move mouse to controlpoint", () =>
+            {
+                var pos = blueprintContainer.ChildrenOfType<PathControlPointPiece>().ElementAt(1).ScreenSpaceDrawQuad.Centre;
+                InputManager.MoveMouseTo(pos);
+            });
+            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
+
+            AddStep("right click", () => InputManager.Click(MouseButton.Right));
+            AddAssert("slider has 2 points", () => slider.Path.ControlPoints.Count == 2);
+
+            AddStep("right click", () => InputManager.Click(MouseButton.Right));
+
+            // second click should nuke the object completely.
+            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
+
+            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
+        }
+    }
+}

osu.Game.Tests/Visual/Editing/TestSceneEditorSummaryTimeline.cs

@@ -5,7 +5,6 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Game.Rulesets.Osu;
-using osu.Game.Rulesets.Osu.Beatmaps;
 using osu.Game.Screens.Edit;
 using osu.Game.Screens.Edit.Components.Timelines.Summary;
 using osuTK;
@@ -16,18 +15,28 @@ namespace osu.Game.Tests.Visual.Editing
     public class TestSceneEditorSummaryTimeline : EditorClockTestScene
     {
         [Cached(typeof(EditorBeatmap))]
-        private readonly EditorBeatmap editorBeatmap = new EditorBeatmap(new OsuBeatmap());
+        private readonly EditorBeatmap editorBeatmap;
 
-        [BackgroundDependencyLoader]
-        private void load()
+        public TestSceneEditorSummaryTimeline()
         {
-            Beatmap.Value = CreateWorkingBeatmap(new OsuRuleset().RulesetInfo);
+            editorBeatmap = new EditorBeatmap(CreateBeatmap(new OsuRuleset().RulesetInfo));
+        }
 
-            Add(new SummaryTimeline
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            AddStep("create timeline", () =>
             {
-                Anchor = Anchor.Centre,
-                Origin = Anchor.Centre,
-                Size = new Vector2(500, 50)
+                // required for track
+                Beatmap.Value = CreateWorkingBeatmap(editorBeatmap.PlayableBeatmap);
+
+                Add(new SummaryTimeline
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Size = new Vector2(500, 50)
+                });
             });
         }
     }

osu.Game.Tests/Visual/Editing/TestSceneTimelineHitObjectBlueprint.cs

@@ -21,7 +21,7 @@ namespace osu.Game.Tests.Visual.Editing
         [Test]
         public void TestDisallowZeroDurationObjects()
         {
-            DragBar dragBar;
+            DragArea dragArea;
 
             AddStep("add spinner", () =>
             {
@@ -29,7 +29,7 @@ namespace osu.Game.Tests.Visual.Editing
                 EditorBeatmap.Add(new Spinner
                 {
                     Position = new Vector2(256, 256),
-                    StartTime = 150,
+                    StartTime = 2700,
                     Duration = 500
                 });
             });
@@ -37,8 +37,8 @@ namespace osu.Game.Tests.Visual.Editing
             AddStep("hold down drag bar", () =>
             {
                 // distinguishes between the actual drag bar and its "underlay shadow".
-                dragBar = this.ChildrenOfType<DragBar>().Single(bar => bar.HandlePositionalInput);
-                InputManager.MoveMouseTo(dragBar);
+                dragArea = this.ChildrenOfType<DragArea>().Single(bar => bar.HandlePositionalInput);
+                InputManager.MoveMouseTo(dragArea);
                 InputManager.PressButton(MouseButton.Left);
             });
 

osu.Game.Tests/Visual/Editing/TimelineTestScene.cs

@@ -53,13 +53,10 @@ namespace osu.Game.Tests.Visual.Editing
                         new AudioVisualiser(),
                     }
                 },
-                TimelineArea = new TimelineArea
+                TimelineArea = new TimelineArea(CreateTestComponent())
                 {
-                    Child = CreateTestComponent(),
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
-                    RelativeSizeAxes = Axes.X,
-                    Size = new Vector2(0.8f, 100),
                 }
             });
         }

osu.Game.Tests/Visual/Gameplay/TestScenePlayerLoader.cs

@@ -25,6 +25,7 @@ using osu.Game.Rulesets.Scoring;
 using osu.Game.Scoring;
 using osu.Game.Screens.Play;
 using osu.Game.Screens.Play.PlayerSettings;
+using osu.Game.Utils;
 using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.Gameplay
@@ -48,6 +49,9 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Cached]
         private readonly VolumeOverlay volumeOverlay;
 
+        [Cached(typeof(BatteryInfo))]
+        private readonly LocalBatteryInfo batteryInfo = new LocalBatteryInfo();
+
         private readonly ChangelogOverlay changelogOverlay;
 
         public TestScenePlayerLoader()
@@ -288,6 +292,33 @@ namespace osu.Game.Tests.Visual.Gameplay
             }
         }
 
+        [TestCase(false, 1.0, false)] // not charging, above cutoff --> no warning
+        [TestCase(true, 0.1, false)] // charging, below cutoff --> no warning
+        [TestCase(false, 0.25, true)] // not charging, at cutoff --> warning
+        public void TestLowBatteryNotification(bool isCharging, double chargeLevel, bool shouldWarn)
+        {
+            AddStep("reset notification lock", () => sessionStatics.GetBindable<bool>(Static.LowBatteryNotificationShownOnce).Value = false);
+
+            // set charge status and level
+            AddStep("load player", () => resetPlayer(false, () =>
+            {
+                batteryInfo.SetCharging(isCharging);
+                batteryInfo.SetChargeLevel(chargeLevel);
+            }));
+            AddUntilStep("wait for player", () => player?.LoadState == LoadState.Ready);
+            AddAssert($"notification {(shouldWarn ? "triggered" : "not triggered")}", () => notificationOverlay.UnreadCount.Value == (shouldWarn ? 1 : 0));
+            AddStep("click notification", () =>
+            {
+                var scrollContainer = (OsuScrollContainer)notificationOverlay.Children.Last();
+                var flowContainer = scrollContainer.Children.OfType<FillFlowContainer<NotificationSection>>().First();
+                var notification = flowContainer.First();
+
+                InputManager.MoveMouseTo(notification);
+                InputManager.Click(MouseButton.Left);
+            });
+            AddUntilStep("wait for player load", () => player.IsLoaded);
+        }
+
         [Test]
         public void TestEpilepsyWarningEarlyExit()
         {
@@ -321,6 +352,7 @@ namespace osu.Game.Tests.Visual.Gameplay
             public override string Name => string.Empty;
             public override string Acronym => string.Empty;
             public override double ScoreMultiplier => 1;
+            public override string Description => string.Empty;
 
             public bool Applied { get; private set; }
 
@@ -348,5 +380,29 @@ namespace osu.Game.Tests.Visual.Gameplay
                     throw new TimeoutException();
             }
         }
+
+        /// <summary>
+        /// Mutable dummy BatteryInfo class for <see cref="TestScenePlayerLoader.TestLowBatteryNotification"/>
+        /// </summary>
+        /// <inheritdoc/>
+        private class LocalBatteryInfo : BatteryInfo
+        {
+            private bool isCharging = true;
+            private double chargeLevel = 1;
+
+            public override bool IsCharging => isCharging;
+
+            public override double ChargeLevel => chargeLevel;
+
+            public void SetCharging(bool value)
+            {
+                isCharging = value;
+            }
+
+            public void SetChargeLevel(double value)
+            {
+                chargeLevel = value;
+            }
+        }
     }
 }

osu.Game.Tests/Visual/Gameplay/TestSceneSpectator.cs

@@ -83,7 +83,7 @@ namespace osu.Game.Tests.Visual.Gameplay
             waitForPlayer();
             AddAssert("ensure frames arrived", () => replayHandler.HasFrames);
 
-            AddUntilStep("wait for frame starvation", () => replayHandler.NextFrame == null);
+            AddUntilStep("wait for frame starvation", () => replayHandler.WaitingForFrame);
             checkPaused(true);
 
             double? pausedTime = null;
@@ -92,7 +92,7 @@ namespace osu.Game.Tests.Visual.Gameplay
 
             sendFrames();
 
-            AddUntilStep("wait for frame starvation", () => replayHandler.NextFrame == null);
+            AddUntilStep("wait for frame starvation", () => replayHandler.WaitingForFrame);
             checkPaused(true);
 
             AddAssert("time advanced", () => currentFrameStableTime > pausedTime);

osu.Game.Tests/Visual/Gameplay/TestSceneSpectatorPlayback.cs

@@ -204,27 +204,27 @@ namespace osu.Game.Tests.Visual.Gameplay
                 return;
             }
 
-            if (replayHandler.NextFrame != null)
-            {
-                var lastFrame = replay.Frames.LastOrDefault();
+            if (!replayHandler.HasFrames)
+                return;
 
-                // this isn't perfect as we basically can't be aware of the rate-of-send here (the streamer is not sending data when not being moved).
-                // in gameplay playback, the case where NextFrame is null would pause gameplay and handle this correctly; it's strictly a test limitation / best effort implementation.
-                if (lastFrame != null)
-                    latency = Math.Max(latency, Time.Current - lastFrame.Time);
+            var lastFrame = replay.Frames.LastOrDefault();
 
-                latencyDisplay.Text = $"latency: {latency:N1}";
+            // this isn't perfect as we basically can't be aware of the rate-of-send here (the streamer is not sending data when not being moved).
+            // in gameplay playback, the case where NextFrame is null would pause gameplay and handle this correctly; it's strictly a test limitation / best effort implementation.
+            if (lastFrame != null)
+                latency = Math.Max(latency, Time.Current - lastFrame.Time);
 
-                double proposedTime = Time.Current - latency + Time.Elapsed;
+            latencyDisplay.Text = $"latency: {latency:N1}";
 
-                // this will either advance by one or zero frames.
-                double? time = replayHandler.SetFrameFromTime(proposedTime);
+            double proposedTime = Time.Current - latency + Time.Elapsed;
 
-                if (time == null)
-                    return;
+            // this will either advance by one or zero frames.
+            double? time = replayHandler.SetFrameFromTime(proposedTime);
 
-                manualClock.CurrentTime = time.Value;
-            }
+            if (time == null)
+                return;
+
+            manualClock.CurrentTime = time.Value;
         }
 
         [TearDownSteps]

osu.Game.Tests/Visual/Multiplayer/TestSceneMultiplayerMatchSubScreen.cs

@@ -13,6 +13,7 @@ using osu.Game.Online.Multiplayer;
 using osu.Game.Online.Rooms;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Osu;
+using osu.Game.Screens.OnlinePlay.Components;
 using osu.Game.Screens.OnlinePlay.Multiplayer;
 using osu.Game.Screens.OnlinePlay.Multiplayer.Match;
 using osu.Game.Tests.Beatmaps;
@@ -128,6 +129,8 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 InputManager.Click(MouseButton.Left);
             });
 
+            AddUntilStep("wait for ready button to be enabled", () => this.ChildrenOfType<MultiplayerReadyButton>().Single().ChildrenOfType<ReadyButton>().Single().Enabled.Value);
+
             AddStep("click ready button", () =>
             {
                 InputManager.MoveMouseTo(this.ChildrenOfType<MultiplayerReadyButton>().Single());

osu.Game.Tests/Visual/UserInterface/TestSceneModButton.cs

@@ -57,6 +57,8 @@ namespace osu.Game.Tests.Visual.UserInterface
         private abstract class TestMod : Mod, IApplicableMod
         {
             public override double ScoreMultiplier => 1.0;
+
+            public override string Description => "This is a test mod.";
         }
     }
 }

osu.Game.Tests/Visual/UserInterface/TestSceneModSettings.cs

@@ -226,6 +226,8 @@ namespace osu.Game.Tests.Visual.UserInterface
         {
             public override double ScoreMultiplier => 1.0;
 
+            public override string Description => "This is a customisable test mod.";
+
             public override ModType Type => ModType.Conversion;
 
             [SettingSource("Sample float", "Change something for a mod")]

osu.Game.Tests/osu.Game.Tests.csproj

@@ -22,4 +22,4 @@
     <ProjectReference Include="..\osu.Game.Rulesets.Mania\osu.Game.Rulesets.Mania.csproj" />
     <ProjectReference Include="..\osu.Game.Rulesets.Taiko\osu.Game.Rulesets.Taiko.csproj" />
   </ItemGroup>
-</Project>
+</Project>

osu.Game/Beatmaps/ControlPoints/DifficultyControlPoint.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Beatmaps.ControlPoints
             MaxValue = 10
         };
 
-        public override Color4 GetRepresentingColour(OsuColour colours) => colours.GreenDark;
+        public override Color4 GetRepresentingColour(OsuColour colours) => colours.Lime1;
 
         /// <summary>
         /// The speed multiplier at this control point.

osu.Game/Beatmaps/ControlPoints/TimingControlPoint.cs

@@ -20,7 +20,7 @@ namespace osu.Game.Beatmaps.ControlPoints
         /// </summary>
         private const double default_beat_length = 60000.0 / 60.0;
 
-        public override Color4 GetRepresentingColour(OsuColour colours) => colours.YellowDark;
+        public override Color4 GetRepresentingColour(OsuColour colours) => colours.Orange1;
 
         public static readonly TimingControlPoint DEFAULT = new TimingControlPoint
         {

osu.Game/Configuration/SessionStatics.cs

@@ -16,6 +16,7 @@ namespace osu.Game.Configuration
         {
             SetDefault(Static.LoginOverlayDisplayed, false);
             SetDefault(Static.MutedAudioNotificationShownOnce, false);
+            SetDefault(Static.LowBatteryNotificationShownOnce, false);
             SetDefault(Static.LastHoverSoundPlaybackTime, (double?)null);
             SetDefault<APISeasonalBackgrounds>(Static.SeasonalBackgrounds, null);
         }
@@ -25,6 +26,7 @@ namespace osu.Game.Configuration
     {
         LoginOverlayDisplayed,
         MutedAudioNotificationShownOnce,
+        LowBatteryNotificationShownOnce,
 
         /// <summary>
         /// Info about seasonal backgrounds available fetched from API - see <see cref="APISeasonalBackgrounds"/>.

osu.Game/Extensions/DrawableExtensions.cs

@@ -9,6 +9,9 @@ namespace osu.Game.Extensions
 {
     public static class DrawableExtensions
     {
+        public const double REPEAT_INTERVAL = 70;
+        public const double INITIAL_DELAY = 250;
+
         /// <summary>
         /// Helper method that is used while <see cref="IKeyBindingHandler"/> doesn't support repetitions of <see cref="IKeyBindingHandler{T}.OnPressed"/>.
         /// Simulates repetitions by continually invoking a delegate according to the default key repeat rate.
@@ -19,12 +22,13 @@ namespace osu.Game.Extensions
         /// <param name="handler">The <see cref="IKeyBindingHandler{T}"/> which is handling the repeat.</param>
         /// <param name="scheduler">The <see cref="Scheduler"/> to schedule repetitions on.</param>
         /// <param name="action">The <see cref="Action"/> to be invoked once immediately and with every repetition.</param>
+        /// <param name="initialRepeatDelay">The delay imposed on the first repeat. Defaults to <see cref="INITIAL_DELAY"/>.</param>
         /// <returns>A <see cref="ScheduledDelegate"/> which can be cancelled to stop the repeat events from firing.</returns>
-        public static ScheduledDelegate BeginKeyRepeat(this IKeyBindingHandler handler, Scheduler scheduler, Action action)
+        public static ScheduledDelegate BeginKeyRepeat(this IKeyBindingHandler handler, Scheduler scheduler, Action action, double initialRepeatDelay = INITIAL_DELAY)
         {
             action();
 
-            ScheduledDelegate repeatDelegate = new ScheduledDelegate(action, handler.Time.Current + 250, 70);
+            ScheduledDelegate repeatDelegate = new ScheduledDelegate(action, handler.Time.Current + initialRepeatDelay, REPEAT_INTERVAL);
             scheduler.Add(repeatDelegate);
             return repeatDelegate;
         }

osu.Game/Graphics/Containers/OsuFocusedOverlayContainer.cs

@@ -23,6 +23,8 @@ namespace osu.Game.Graphics.Containers
         protected virtual string PopInSampleName => "UI/overlay-pop-in";
         protected virtual string PopOutSampleName => "UI/overlay-pop-out";
 
+        protected override bool BlockScrollInput => false;
+
         protected override bool BlockNonPositionalInput => true;
 
         /// <summary>

osu.Game/Graphics/Containers/UserDimContainer.cs

@@ -23,11 +23,6 @@ namespace osu.Game.Graphics.Containers
 
         protected const double BACKGROUND_FADE_DURATION = 800;
 
-        /// <summary>
-        /// Whether or not user-configured dim levels should be applied to the container.
-        /// </summary>
-        public readonly Bindable<bool> EnableUserDim = new Bindable<bool>(true);
-
         /// <summary>
         /// Whether or not user-configured settings relating to brightness of elements should be ignored
         /// </summary>
@@ -57,7 +52,7 @@ namespace osu.Game.Graphics.Containers
 
         private float breakLightening => LightenDuringBreaks.Value && IsBreakTime.Value ? BREAK_LIGHTEN_AMOUNT : 0;
 
-        protected float DimLevel => Math.Max(EnableUserDim.Value && !IgnoreUserSettings.Value ? (float)UserDimLevel.Value - breakLightening : 0, 0);
+        protected float DimLevel => Math.Max(!IgnoreUserSettings.Value ? (float)UserDimLevel.Value - breakLightening : 0, 0);
 
         protected override Container<Drawable> Content => dimContent;
 
@@ -78,7 +73,6 @@ namespace osu.Game.Graphics.Containers
             LightenDuringBreaks = config.GetBindable<bool>(OsuSetting.LightenDuringBreaks);
             ShowStoryboard = config.GetBindable<bool>(OsuSetting.ShowStoryboard);
 
-            EnableUserDim.ValueChanged += _ => UpdateVisuals();
             UserDimLevel.ValueChanged += _ => UpdateVisuals();
             LightenDuringBreaks.ValueChanged += _ => UpdateVisuals();
             IsBreakTime.ValueChanged += _ => UpdateVisuals();

osu.Game/Graphics/OsuColour.cs

@@ -186,6 +186,13 @@ namespace osu.Game.Graphics
         public readonly Color4 GrayE = Color4Extensions.FromHex(@"eee");
         public readonly Color4 GrayF = Color4Extensions.FromHex(@"fff");
 
+        // in latest editor design logic, need to figure out where these sit...
+        public readonly Color4 Lime1 = Color4Extensions.FromHex(@"b2ff66");
+        public readonly Color4 Orange1 = Color4Extensions.FromHex(@"ffd966");
+
+        // Content Background
+        public readonly Color4 B5 = Color4Extensions.FromHex(@"222a28");
+
         public readonly Color4 RedLighter = Color4Extensions.FromHex(@"ffeded");
         public readonly Color4 RedLight = Color4Extensions.FromHex(@"ed7787");
         public readonly Color4 Red = Color4Extensions.FromHex(@"ed1121");

osu.Game/Input/Bindings/GlobalActionContainer.cs

@@ -70,6 +70,7 @@ namespace osu.Game.Input.Bindings
             new KeyBinding(new[] { InputKey.F2 }, GlobalAction.EditorDesignMode),
             new KeyBinding(new[] { InputKey.F3 }, GlobalAction.EditorTimingMode),
             new KeyBinding(new[] { InputKey.F4 }, GlobalAction.EditorSetupMode),
+            new KeyBinding(new[] { InputKey.Control, InputKey.Shift, InputKey.A }, GlobalAction.EditorVerifyMode),
         };
 
         public IEnumerable<KeyBinding> InGameKeyBindings => new[]
@@ -97,9 +98,7 @@ namespace osu.Game.Input.Bindings
         public IEnumerable<KeyBinding> AudioControlKeyBindings => new[]
         {
             new KeyBinding(new[] { InputKey.Alt, InputKey.Up }, GlobalAction.IncreaseVolume),
-            new KeyBinding(new[] { InputKey.Alt, InputKey.MouseWheelUp }, GlobalAction.IncreaseVolume),
             new KeyBinding(new[] { InputKey.Alt, InputKey.Down }, GlobalAction.DecreaseVolume),
-            new KeyBinding(new[] { InputKey.Alt, InputKey.MouseWheelDown }, GlobalAction.DecreaseVolume),
 
             new KeyBinding(new[] { InputKey.Control, InputKey.F4 }, GlobalAction.ToggleMute),
 
@@ -249,5 +248,8 @@ namespace osu.Game.Input.Bindings
 
         [Description("Beatmap Options")]
         ToggleBeatmapOptions,
+
+        [Description("Verify mode")]
+        EditorVerifyMode,
     }
 }

osu.Game/Input/Handlers/ReplayInputHandler.cs

@@ -32,8 +32,6 @@ namespace osu.Game.Input.Handlers
 
         public override bool Initialize(GameHost host) => true;
 
-        public override bool IsActive => true;
-
         public class ReplayState<T> : IInput
             where T : struct
         {

osu.Game/Migrations/20210412045700_RefreshVolumeBindingsAgain.Designer.cs

@@ -0,0 +1,506 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using osu.Game.Database;
+
+namespace osu.Game.Migrations
+{
+    [DbContext(typeof(OsuDbContext))]
+    [Migration("20210412045700_RefreshVolumeBindingsAgain")]
+    partial class RefreshVolumeBindingsAgain
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "2.2.6-servicing-10079");
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapDifficulty", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<float>("ApproachRate");
+
+                    b.Property<float>("CircleSize");
+
+                    b.Property<float>("DrainRate");
+
+                    b.Property<float>("OverallDifficulty");
+
+                    b.Property<double>("SliderMultiplier");
+
+                    b.Property<double>("SliderTickRate");
+
+                    b.HasKey("ID");
+
+                    b.ToTable("BeatmapDifficulty");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<double>("AudioLeadIn");
+
+                    b.Property<double>("BPM");
+
+                    b.Property<int>("BaseDifficultyID");
+
+                    b.Property<int>("BeatDivisor");
+
+                    b.Property<int>("BeatmapSetInfoID");
+
+                    b.Property<bool>("Countdown");
+
+                    b.Property<double>("DistanceSpacing");
+
+                    b.Property<int>("GridSize");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<bool>("Hidden");
+
+                    b.Property<double>("Length");
+
+                    b.Property<bool>("LetterboxInBreaks");
+
+                    b.Property<string>("MD5Hash");
+
+                    b.Property<int?>("MetadataID");
+
+                    b.Property<int?>("OnlineBeatmapID");
+
+                    b.Property<string>("Path");
+
+                    b.Property<int>("RulesetID");
+
+                    b.Property<bool>("SpecialStyle");
+
+                    b.Property<float>("StackLeniency");
+
+                    b.Property<double>("StarDifficulty");
+
+                    b.Property<int>("Status");
+
+                    b.Property<string>("StoredBookmarks");
+
+                    b.Property<double>("TimelineZoom");
+
+                    b.Property<string>("Version");
+
+                    b.Property<bool>("WidescreenStoryboard");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BaseDifficultyID");
+
+                    b.HasIndex("BeatmapSetInfoID");
+
+                    b.HasIndex("Hash");
+
+                    b.HasIndex("MD5Hash");
+
+                    b.HasIndex("MetadataID");
+
+                    b.HasIndex("OnlineBeatmapID")
+                        .IsUnique();
+
+                    b.HasIndex("RulesetID");
+
+                    b.ToTable("BeatmapInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapMetadata", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Artist");
+
+                    b.Property<string>("ArtistUnicode");
+
+                    b.Property<string>("AudioFile");
+
+                    b.Property<string>("AuthorString")
+                        .HasColumnName("Author");
+
+                    b.Property<string>("BackgroundFile");
+
+                    b.Property<int>("PreviewTime");
+
+                    b.Property<string>("Source");
+
+                    b.Property<string>("Tags");
+
+                    b.Property<string>("Title");
+
+                    b.Property<string>("TitleUnicode");
+
+                    b.Property<string>("VideoFile");
+
+                    b.HasKey("ID");
+
+                    b.ToTable("BeatmapMetadata");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("BeatmapSetInfoID");
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BeatmapSetInfoID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.ToTable("BeatmapSetFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<DateTimeOffset>("DateAdded");
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int?>("MetadataID");
+
+                    b.Property<int?>("OnlineBeatmapSetID");
+
+                    b.Property<bool>("Protected");
+
+                    b.Property<int>("Status");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("DeletePending");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.HasIndex("MetadataID");
+
+                    b.HasIndex("OnlineBeatmapSetID")
+                        .IsUnique();
+
+                    b.ToTable("BeatmapSetInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Configuration.DatabasedSetting", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Key")
+                        .HasColumnName("Key");
+
+                    b.Property<int?>("RulesetID");
+
+                    b.Property<int?>("SkinInfoID");
+
+                    b.Property<string>("StringValue")
+                        .HasColumnName("Value");
+
+                    b.Property<int?>("Variant");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("SkinInfoID");
+
+                    b.HasIndex("RulesetID", "Variant");
+
+                    b.ToTable("Settings");
+                });
+
+            modelBuilder.Entity("osu.Game.IO.FileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int>("ReferenceCount");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.HasIndex("ReferenceCount");
+
+                    b.ToTable("FileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Input.Bindings.DatabasedKeyBinding", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("IntAction")
+                        .HasColumnName("Action");
+
+                    b.Property<string>("KeysString")
+                        .HasColumnName("Keys");
+
+                    b.Property<int?>("RulesetID");
+
+                    b.Property<int?>("Variant");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("IntAction");
+
+                    b.HasIndex("RulesetID", "Variant");
+
+                    b.ToTable("KeyBinding");
+                });
+
+            modelBuilder.Entity("osu.Game.Rulesets.RulesetInfo", b =>
+                {
+                    b.Property<int?>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<bool>("Available");
+
+                    b.Property<string>("InstantiationInfo");
+
+                    b.Property<string>("Name");
+
+                    b.Property<string>("ShortName");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("Available");
+
+                    b.HasIndex("ShortName")
+                        .IsUnique();
+
+                    b.ToTable("RulesetInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.Property<int?>("ScoreInfoID");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.HasIndex("ScoreInfoID");
+
+                    b.ToTable("ScoreFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<double>("Accuracy")
+                        .HasColumnType("DECIMAL(1,4)");
+
+                    b.Property<int>("BeatmapInfoID");
+
+                    b.Property<int>("Combo");
+
+                    b.Property<DateTimeOffset>("Date");
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<int>("MaxCombo");
+
+                    b.Property<string>("ModsJson")
+                        .HasColumnName("Mods");
+
+                    b.Property<long?>("OnlineScoreID");
+
+                    b.Property<double?>("PP");
+
+                    b.Property<int>("Rank");
+
+                    b.Property<int>("RulesetID");
+
+                    b.Property<string>("StatisticsJson")
+                        .HasColumnName("Statistics");
+
+                    b.Property<long>("TotalScore");
+
+                    b.Property<long?>("UserID")
+                        .HasColumnName("UserID");
+
+                    b.Property<string>("UserString")
+                        .HasColumnName("User");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("BeatmapInfoID");
+
+                    b.HasIndex("OnlineScoreID")
+                        .IsUnique();
+
+                    b.HasIndex("RulesetID");
+
+                    b.ToTable("ScoreInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinFileInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<int>("FileInfoID");
+
+                    b.Property<string>("Filename")
+                        .IsRequired();
+
+                    b.Property<int>("SkinInfoID");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("FileInfoID");
+
+                    b.HasIndex("SkinInfoID");
+
+                    b.ToTable("SkinFileInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinInfo", b =>
+                {
+                    b.Property<int>("ID")
+                        .ValueGeneratedOnAdd();
+
+                    b.Property<string>("Creator");
+
+                    b.Property<bool>("DeletePending");
+
+                    b.Property<string>("Hash");
+
+                    b.Property<string>("Name");
+
+                    b.HasKey("ID");
+
+                    b.HasIndex("DeletePending");
+
+                    b.HasIndex("Hash")
+                        .IsUnique();
+
+                    b.ToTable("SkinInfo");
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapDifficulty", "BaseDifficulty")
+                        .WithMany()
+                        .HasForeignKey("BaseDifficultyID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Beatmaps.BeatmapSetInfo", "BeatmapSet")
+                        .WithMany("Beatmaps")
+                        .HasForeignKey("BeatmapSetInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Beatmaps.BeatmapMetadata", "Metadata")
+                        .WithMany("Beatmaps")
+                        .HasForeignKey("MetadataID");
+
+                    b.HasOne("osu.Game.Rulesets.RulesetInfo", "Ruleset")
+                        .WithMany()
+                        .HasForeignKey("RulesetID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapSetInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("BeatmapSetInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Beatmaps.BeatmapSetInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapMetadata", "Metadata")
+                        .WithMany("BeatmapSets")
+                        .HasForeignKey("MetadataID");
+                });
+
+            modelBuilder.Entity("osu.Game.Configuration.DatabasedSetting", b =>
+                {
+                    b.HasOne("osu.Game.Skinning.SkinInfo")
+                        .WithMany("Settings")
+                        .HasForeignKey("SkinInfoID");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Scoring.ScoreInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("ScoreInfoID");
+                });
+
+            modelBuilder.Entity("osu.Game.Scoring.ScoreInfo", b =>
+                {
+                    b.HasOne("osu.Game.Beatmaps.BeatmapInfo", "Beatmap")
+                        .WithMany("Scores")
+                        .HasForeignKey("BeatmapInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Rulesets.RulesetInfo", "Ruleset")
+                        .WithMany()
+                        .HasForeignKey("RulesetID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
+            modelBuilder.Entity("osu.Game.Skinning.SkinFileInfo", b =>
+                {
+                    b.HasOne("osu.Game.IO.FileInfo", "FileInfo")
+                        .WithMany()
+                        .HasForeignKey("FileInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("osu.Game.Skinning.SkinInfo")
+                        .WithMany("Files")
+                        .HasForeignKey("SkinInfoID")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

osu.Game/Migrations/20210412045700_RefreshVolumeBindingsAgain.cs

@@ -0,0 +1,16 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace osu.Game.Migrations
+{
+    public partial class RefreshVolumeBindingsAgain : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.Sql("DELETE FROM KeyBinding WHERE action in (6,7)");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}

osu.Game/OsuGameBase.cs

@@ -40,6 +40,7 @@ using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Scoring;
 using osu.Game.Skinning;
+using osu.Game.Utils;
 using osuTK.Input;
 using RuntimeInfo = osu.Framework.RuntimeInfo;
 
@@ -156,6 +157,8 @@ namespace osu.Game
 
         protected override UserInputManager CreateUserInputManager() => new OsuUserInputManager();
 
+        protected virtual BatteryInfo CreateBatteryInfo() => null;
+
         /// <summary>
         /// The maximum volume at which audio tracks should playback. This can be set lower than 1 to create some head-room for sound effects.
         /// </summary>
@@ -281,6 +284,11 @@ namespace osu.Game
             dependencies.Cache(KeyBindingStore = new KeyBindingStore(contextFactory, RulesetStore));
             dependencies.Cache(SettingsStore = new SettingsStore(contextFactory));
             dependencies.Cache(RulesetConfigCache = new RulesetConfigCache(SettingsStore));
+
+            var powerStatus = CreateBatteryInfo();
+            if (powerStatus != null)
+                dependencies.CacheAs(powerStatus);
+
             dependencies.Cache(new SessionStatics());
             dependencies.Cache(new OsuColour());
 

osu.Game/Overlays/Volume/VolumeControlReceptor.cs

@@ -6,6 +6,8 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Input;
 using osu.Framework.Input.Bindings;
 using osu.Framework.Input.Events;
+using osu.Framework.Threading;
+using osu.Game.Extensions;
 using osu.Game.Input.Bindings;
 
 namespace osu.Game.Overlays.Volume
@@ -15,8 +17,30 @@ namespace osu.Game.Overlays.Volume
         public Func<GlobalAction, bool> ActionRequested;
         public Func<GlobalAction, float, bool, bool> ScrollActionRequested;
 
-        public bool OnPressed(GlobalAction action) =>
-            ActionRequested?.Invoke(action) ?? false;
+        private ScheduledDelegate keyRepeat;
+
+        public bool OnPressed(GlobalAction action)
+        {
+            switch (action)
+            {
+                case GlobalAction.DecreaseVolume:
+                case GlobalAction.IncreaseVolume:
+                    keyRepeat?.Cancel();
+                    keyRepeat = this.BeginKeyRepeat(Scheduler, () => ActionRequested?.Invoke(action), 150);
+                    return true;
+
+                case GlobalAction.ToggleMute:
+                    ActionRequested?.Invoke(action);
+                    return true;
+            }
+
+            return false;
+        }
+
+        public void OnReleased(GlobalAction action)
+        {
+            keyRepeat?.Cancel();
+        }
 
         protected override bool OnScroll(ScrollEvent e)
         {
@@ -27,9 +51,5 @@ namespace osu.Game.Overlays.Volume
 
         public bool OnScroll(GlobalAction action, float amount, bool isPrecise) =>
             ScrollActionRequested?.Invoke(action, amount, isPrecise) ?? false;
-
-        public void OnReleased(GlobalAction action)
-        {
-        }
     }
 }

osu.Game/Overlays/Volume/VolumeMeter.cs

@@ -13,6 +13,7 @@ using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Input.Bindings;
 using osu.Framework.Input.Events;
+using osu.Framework.Threading;
 using osu.Framework.Utils;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
@@ -225,7 +226,7 @@ namespace osu.Game.Overlays.Volume
             private set => Bindable.Value = value;
         }
 
-        private const double adjust_step = 0.05;
+        private const double adjust_step = 0.01;
 
         public void Increase(double amount = 1, bool isPrecise = false) => adjust(amount, isPrecise);
         public void Decrease(double amount = 1, bool isPrecise = false) => adjust(-amount, isPrecise);
@@ -233,16 +234,40 @@ namespace osu.Game.Overlays.Volume
         // because volume precision is set to 0.01, this local is required to keep track of more precise adjustments and only apply when possible.
         private double scrollAccumulation;
 
+        private double accelerationModifier = 1;
+
+        private const double max_acceleration = 5;
+        private const double acceleration_multiplier = 1.8;
+
+        private ScheduledDelegate accelerationDebounce;
+
+        private void resetAcceleration() => accelerationModifier = 1;
+
         private void adjust(double delta, bool isPrecise)
         {
-            scrollAccumulation += delta * adjust_step * (isPrecise ? 0.1 : 1);
+            // every adjust increment increases the rate at which adjustments happen up to a cutoff.
+            // this debounce will reset on inactivity.
+            accelerationDebounce?.Cancel();
+            accelerationDebounce = Scheduler.AddDelayed(resetAcceleration, 150);
+
+            delta *= accelerationModifier;
+            accelerationModifier = Math.Min(max_acceleration, accelerationModifier * acceleration_multiplier);
 
             var precision = Bindable.Precision;
 
-            while (Precision.AlmostBigger(Math.Abs(scrollAccumulation), precision))
+            if (isPrecise)
             {
-                Volume += Math.Sign(scrollAccumulation) * precision;
-                scrollAccumulation = scrollAccumulation < 0 ? Math.Min(0, scrollAccumulation + precision) : Math.Max(0, scrollAccumulation - precision);
+                scrollAccumulation += delta * adjust_step * 0.1;
+
+                while (Precision.AlmostBigger(Math.Abs(scrollAccumulation), precision))
+                {
+                    Volume += Math.Sign(scrollAccumulation) * precision;
+                    scrollAccumulation = scrollAccumulation < 0 ? Math.Min(0, scrollAccumulation + precision) : Math.Max(0, scrollAccumulation - precision);
+                }
+            }
+            else
+            {
+                Volume += Math.Sign(delta) * Math.Max(precision, Math.Abs(delta * adjust_step));
             }
         }
 

osu.Game/Rulesets/Edit/BeatmapVerifier.cs

@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Edit
+{
+    /// <summary>
+    /// A ruleset-agnostic beatmap verifier that identifies issues in common metadata or mapping standards.
+    /// </summary>
+    public class BeatmapVerifier : IBeatmapVerifier
+    {
+        private readonly List<ICheck> checks = new List<ICheck>
+        {
+            new CheckBackground(),
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap) => checks.SelectMany(check => check.Run(beatmap));
+    }
+}

osu.Game/Rulesets/Edit/Checks/CheckBackground.cs

@@ -0,0 +1,61 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Edit.Checks
+{
+    public class CheckBackground : ICheck
+    {
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Resources, "Missing background");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateNoneSet(this),
+            new IssueTemplateDoesNotExist(this)
+        };
+
+        public IEnumerable<Issue> Run(IBeatmap beatmap)
+        {
+            if (beatmap.Metadata.BackgroundFile == null)
+            {
+                yield return new IssueTemplateNoneSet(this).Create();
+
+                yield break;
+            }
+
+            // If the background is set, also make sure it still exists.
+
+            var set = beatmap.BeatmapInfo.BeatmapSet;
+            var file = set.Files.FirstOrDefault(f => f.Filename == beatmap.Metadata.BackgroundFile);
+
+            if (file != null)
+                yield break;
+
+            yield return new IssueTemplateDoesNotExist(this).Create(beatmap.Metadata.BackgroundFile);
+        }
+
+        public class IssueTemplateNoneSet : IssueTemplate
+        {
+            public IssueTemplateNoneSet(ICheck check)
+                : base(check, IssueType.Problem, "No background has been set.")
+            {
+            }
+
+            public Issue Create() => new Issue(this);
+        }
+
+        public class IssueTemplateDoesNotExist : IssueTemplate
+        {
+            public IssueTemplateDoesNotExist(ICheck check)
+                : base(check, IssueType.Problem, "The background file \"{0}\" does not exist.")
+            {
+            }
+
+            public Issue Create(string filename) => new Issue(this, filename);
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/CheckCategory.cs

@@ -0,0 +1,61 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    /// <summary>
+    /// The category of an issue.
+    /// </summary>
+    public enum CheckCategory
+    {
+        /// <summary>
+        /// Anything to do with control points.
+        /// </summary>
+        Timing,
+
+        /// <summary>
+        /// Anything to do with artist, title, creator, etc.
+        /// </summary>
+        Metadata,
+
+        /// <summary>
+        /// Anything to do with non-audio files, e.g. background, skin, sprites, and video.
+        /// </summary>
+        Resources,
+
+        /// <summary>
+        /// Anything to do with audio files, e.g. song and hitsounds.
+        /// </summary>
+        Audio,
+
+        /// <summary>
+        /// Anything to do with files that don't fit into the above, e.g. unused, osu, or osb.
+        /// </summary>
+        Files,
+
+        /// <summary>
+        /// Anything to do with hitobjects unrelated to spread.
+        /// </summary>
+        Compose,
+
+        /// <summary>
+        /// Anything to do with difficulty levels or their progression.
+        /// </summary>
+        Spread,
+
+        /// <summary>
+        /// Anything to do with variables like CS, OD, AR, HP, and global SV.
+        /// </summary>
+        Settings,
+
+        /// <summary>
+        /// Anything to do with hitobject feedback.
+        /// </summary>
+        HitObjects,
+
+        /// <summary>
+        /// Anything to do with storyboarding, breaks, video offset, etc.
+        /// </summary>
+        Events
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/CheckMetadata.cs

@@ -0,0 +1,24 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    public class CheckMetadata
+    {
+        /// <summary>
+        /// The category this check belongs to. E.g. <see cref="CheckCategory.Metadata"/>, <see cref="CheckCategory.Timing"/>, or <see cref="CheckCategory.Compose"/>.
+        /// </summary>
+        public readonly CheckCategory Category;
+
+        /// <summary>
+        /// Describes the issue(s) that this check looks for. Keep this brief, such that it fits into "No {description}". E.g. "Offscreen objects" / "Too short sliders".
+        /// </summary>
+        public readonly string Description;
+
+        public CheckMetadata(CheckCategory category, string description)
+        {
+            Category = category;
+            Description = description;
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/ICheck.cs

@@ -0,0 +1,30 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    /// <summary>
+    /// A specific check that can be run on a beatmap to verify or find issues.
+    /// </summary>
+    public interface ICheck
+    {
+        /// <summary>
+        /// The metadata for this check.
+        /// </summary>
+        public CheckMetadata Metadata { get; }
+
+        /// <summary>
+        /// All possible templates for issues that this check may return.
+        /// </summary>
+        public IEnumerable<IssueTemplate> PossibleTemplates { get; }
+
+        /// <summary>
+        /// Runs this check and returns any issues detected for the provided beatmap.
+        /// </summary>
+        /// <param name="beatmap">The beatmap to run the check on.</param>
+        public IEnumerable<Issue> Run(IBeatmap beatmap);
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/Issue.cs

@@ -0,0 +1,77 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Extensions;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    public class Issue
+    {
+        /// <summary>
+        /// The time which this issue is associated with, if any, otherwise null.
+        /// </summary>
+        public double? Time;
+
+        /// <summary>
+        /// The hitobjects which this issue is associated with. Empty by default.
+        /// </summary>
+        public IReadOnlyList<HitObject> HitObjects;
+
+        /// <summary>
+        /// The template which this issue is using. This provides properties such as the <see cref="IssueType"/>, and the <see cref="IssueTemplate.UnformattedMessage"/>.
+        /// </summary>
+        public IssueTemplate Template;
+
+        /// <summary>
+        /// The check that this issue originates from.
+        /// </summary>
+        public ICheck Check => Template.Check;
+
+        /// <summary>
+        /// The arguments that give this issue its context, based on the <see cref="IssueTemplate"/>. These are then substituted into the <see cref="IssueTemplate.UnformattedMessage"/>.
+        /// This could for instance include timestamps, which diff is being compared to, what some volume is, etc.
+        /// </summary>
+        public object[] Arguments;
+
+        public Issue(IssueTemplate template, params object[] args)
+        {
+            Time = null;
+            HitObjects = Array.Empty<HitObject>();
+            Template = template;
+            Arguments = args;
+        }
+
+        public Issue(double? time, IssueTemplate template, params object[] args)
+            : this(template, args)
+        {
+            Time = time;
+        }
+
+        public Issue(HitObject hitObject, IssueTemplate template, params object[] args)
+            : this(template, args)
+        {
+            Time = hitObject.StartTime;
+            HitObjects = new[] { hitObject };
+        }
+
+        public Issue(IEnumerable<HitObject> hitObjects, IssueTemplate template, params object[] args)
+            : this(template, args)
+        {
+            var hitObjectList = hitObjects.ToList();
+
+            Time = hitObjectList.FirstOrDefault()?.StartTime;
+            HitObjects = hitObjectList;
+        }
+
+        public override string ToString() => Template.GetMessage(Arguments);
+
+        public string GetEditorTimestamp()
+        {
+            return Time == null ? string.Empty : Time.Value.ToEditorFormattedString();
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/IssueTemplate.cs

@@ -0,0 +1,74 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using Humanizer;
+using osu.Framework.Graphics;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    public class IssueTemplate
+    {
+        private static readonly Color4 problem_red = new Colour4(1.0f, 0.4f, 0.4f, 1.0f);
+        private static readonly Color4 warning_yellow = new Colour4(1.0f, 0.8f, 0.2f, 1.0f);
+        private static readonly Color4 negligible_green = new Colour4(0.33f, 0.8f, 0.5f, 1.0f);
+        private static readonly Color4 error_gray = new Colour4(0.5f, 0.5f, 0.5f, 1.0f);
+
+        /// <summary>
+        /// The check that this template originates from.
+        /// </summary>
+        public readonly ICheck Check;
+
+        /// <summary>
+        /// The type of the issue.
+        /// </summary>
+        public readonly IssueType Type;
+
+        /// <summary>
+        /// The unformatted message given when this issue is detected.
+        /// This gets populated later when an issue is constructed with this template.
+        /// E.g. "Inconsistent snapping (1/{0}) with [{1}] (1/{2})."
+        /// </summary>
+        public readonly string UnformattedMessage;
+
+        public IssueTemplate(ICheck check, IssueType type, string unformattedMessage)
+        {
+            Check = check;
+            Type = type;
+            UnformattedMessage = unformattedMessage;
+        }
+
+        /// <summary>
+        /// Returns the formatted message given the arguments used to format it.
+        /// </summary>
+        /// <param name="args">The arguments used to format the message.</param>
+        public string GetMessage(params object[] args) => UnformattedMessage.FormatWith(args);
+
+        /// <summary>
+        /// Returns the colour corresponding to the type of this issue.
+        /// </summary>
+        public Colour4 Colour
+        {
+            get
+            {
+                switch (Type)
+                {
+                    case IssueType.Problem:
+                        return problem_red;
+
+                    case IssueType.Warning:
+                        return warning_yellow;
+
+                    case IssueType.Negligible:
+                        return negligible_green;
+
+                    case IssueType.Error:
+                        return error_gray;
+
+                    default:
+                        return Color4.White;
+                }
+            }
+        }
+    }
+}

osu.Game/Rulesets/Edit/Checks/Components/IssueType.cs

@@ -0,0 +1,25 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Rulesets.Edit.Checks.Components
+{
+    /// <summary>
+    /// The type, or severity, of an issue.
+    /// </summary>
+    public enum IssueType
+    {
+        /// <summary> A must-fix in the vast majority of cases. </summary>
+        Problem,
+
+        /// <summary> A possible mistake. Often requires critical thinking.  </summary>
+        Warning,
+
+        // TODO: Try/catch all checks run and return error templates if exceptions occur.
+        /// <summary> An error occurred and a complete check could not be made. </summary>
+        Error,
+
+        // TODO: Negligible issues should be hidden by default.
+        /// <summary> A possible mistake so minor/unlikely that it can often be safely ignored. </summary>
+        Negligible,
+    }
+}

osu.Game/Rulesets/Edit/IBeatmapVerifier.cs

@@ -0,0 +1,17 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Edit
+{
+    /// <summary>
+    /// A class which can run against a beatmap and surface issues to the user which could go against known criteria or hinder gameplay.
+    /// </summary>
+    public interface IBeatmapVerifier
+    {
+        public IEnumerable<Issue> Run(IBeatmap beatmap);
+    }
+}

osu.Game/Rulesets/Edit/PlacementBlueprint.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Rulesets.Edit
         /// <summary>
         /// Whether the <see cref="HitObject"/> is currently mid-placement, but has not necessarily finished being placed.
         /// </summary>
-        public bool PlacementActive { get; private set; }
+        public PlacementState PlacementActive { get; private set; }
 
         /// <summary>
         /// The <see cref="HitObject"/> that is being placed.
@@ -72,7 +72,8 @@ namespace osu.Game.Rulesets.Edit
         protected void BeginPlacement(bool commitStart = false)
         {
             placementHandler.BeginPlacement(HitObject);
-            PlacementActive |= commitStart;
+            if (commitStart)
+                PlacementActive = PlacementState.Active;
         }
 
         /// <summary>
@@ -82,10 +83,19 @@ namespace osu.Game.Rulesets.Edit
         /// <param name="commit">Whether the object should be committed.</param>
         public void EndPlacement(bool commit)
         {
-            if (!PlacementActive)
-                BeginPlacement();
+            switch (PlacementActive)
+            {
+                case PlacementState.Finished:
+                    return;
+
+                case PlacementState.Waiting:
+                    // ensure placement was started before ending to make state handling simpler.
+                    BeginPlacement();
+                    break;
+            }
+
             placementHandler.EndPlacement(HitObject, commit);
-            PlacementActive = false;
+            PlacementActive = PlacementState.Finished;
         }
 
         /// <summary>
@@ -94,7 +104,7 @@ namespace osu.Game.Rulesets.Edit
         /// <param name="result">The snap result information.</param>
         public virtual void UpdateTimeAndPosition(SnapResult result)
         {
-            if (!PlacementActive)
+            if (PlacementActive == PlacementState.Waiting)
                 HitObject.StartTime = result.Time ?? EditorClock?.CurrentTime ?? Time.Current;
         }
 
@@ -125,5 +135,12 @@ namespace osu.Game.Rulesets.Edit
                     return false;
             }
         }
+
+        public enum PlacementState
+        {
+            Waiting,
+            Active,
+            Finished
+        }
     }
 }

osu.Game/Rulesets/Mods/Mod.cs

@@ -7,6 +7,7 @@ using System.Linq;
 using System.Reflection;
 using Newtonsoft.Json;
 using osu.Framework.Bindables;
+using osu.Framework.Extensions.TypeExtensions;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Testing;
 using osu.Game.Configuration;
@@ -49,7 +50,7 @@ namespace osu.Game.Rulesets.Mods
         /// The user readable description of this mod.
         /// </summary>
         [JsonIgnore]
-        public virtual string Description => string.Empty;
+        public abstract string Description { get; }
 
         /// <summary>
         /// The tooltip to display for this mod when used in a <see cref="ModIcon"/>.
@@ -170,7 +171,12 @@ namespace osu.Game.Rulesets.Mods
                 target.UnbindFrom(sourceBindable);
             }
             else
-                target.Parse(source);
+            {
+                if (!(target is IParseable parseable))
+                    throw new InvalidOperationException($"Bindable type {target.GetType().ReadableName()} is not {nameof(IParseable)}.");
+
+                parseable.Parse(source);
+            }
         }
 
         public bool Equals(IMod other) => other is Mod them && Equals(them);

osu.Game/Rulesets/Mods/ModCinema.cs

@@ -37,8 +37,7 @@ namespace osu.Game.Rulesets.Mods
 
         public void ApplyToPlayer(Player player)
         {
-            player.ApplyToBackground(b => b.EnableUserDim.Value = false);
-
+            player.ApplyToBackground(b => b.IgnoreUserSettings.Value = true);
             player.DimmableStoryboard.IgnoreUserSettings.Value = true;
 
             player.BreakOverlay.Hide();

osu.Game/Rulesets/Mods/ModNoMod.cs

@@ -12,6 +12,7 @@ namespace osu.Game.Rulesets.Mods
     {
         public override string Name => "No Mod";
         public override string Acronym => "NM";
+        public override string Description => "No mods applied.";
         public override double ScoreMultiplier => 1;
         public override IconUsage? Icon => FontAwesome.Solid.Ban;
         public override ModType Type => ModType.System;

osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs

@@ -56,8 +56,8 @@ namespace osu.Game.Rulesets.Objects.Drawables
 
         public virtual IEnumerable<HitSampleInfo> GetSamples() => HitObject.Samples;
 
-        private readonly Lazy<List<DrawableHitObject>> nestedHitObjects = new Lazy<List<DrawableHitObject>>();
-        public IReadOnlyList<DrawableHitObject> NestedHitObjects => nestedHitObjects.IsValueCreated ? nestedHitObjects.Value : (IReadOnlyList<DrawableHitObject>)Array.Empty<DrawableHitObject>();
+        private readonly List<DrawableHitObject> nestedHitObjects = new List<DrawableHitObject>();
+        public IReadOnlyList<DrawableHitObject> NestedHitObjects => nestedHitObjects;
 
         /// <summary>
         /// Whether this object should handle any user input events.
@@ -249,7 +249,7 @@ namespace osu.Game.Rulesets.Objects.Drawables
                 // Must be done before the nested DHO is added to occur before the nested Apply()!
                 drawableNested.ParentHitObject = this;
 
-                nestedHitObjects.Value.Add(drawableNested);
+                nestedHitObjects.Add(drawableNested);
                 AddNestedHitObject(drawableNested);
             }
 
@@ -305,19 +305,16 @@ namespace osu.Game.Rulesets.Objects.Drawables
             if (Samples != null)
                 Samples.Samples = null;
 
-            if (nestedHitObjects.IsValueCreated)
+            foreach (var obj in nestedHitObjects)
             {
-                foreach (var obj in nestedHitObjects.Value)
-                {
-                    obj.OnNewResult -= onNewResult;
-                    obj.OnRevertResult -= onRevertResult;
-                    obj.ApplyCustomUpdateState -= onApplyCustomUpdateState;
-                }
-
-                nestedHitObjects.Value.Clear();
-                ClearNestedHitObjects();
+                obj.OnNewResult -= onNewResult;
+                obj.OnRevertResult -= onRevertResult;
+                obj.ApplyCustomUpdateState -= onApplyCustomUpdateState;
             }
 
+            nestedHitObjects.Clear();
+            ClearNestedHitObjects();
+
             HitObject.DefaultsApplied -= onDefaultsApplied;
 
             OnFree();

osu.Game/Rulesets/Objects/SliderPath.cs

@@ -30,6 +30,8 @@ namespace osu.Game.Rulesets.Objects
         /// </summary>
         public readonly Bindable<double?> ExpectedDistance = new Bindable<double?>();
 
+        public bool HasValidLength => Distance > 0;
+
         /// <summary>
         /// The control points of the path.
         /// </summary>

osu.Game/Rulesets/Replays/FramedReplayInputHandler.cs

@@ -1,9 +1,10 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using JetBrains.Annotations;
 using osu.Game.Input.Handlers;
 using osu.Game.Replays;
@@ -17,80 +18,101 @@ namespace osu.Game.Rulesets.Replays
     public abstract class FramedReplayInputHandler<TFrame> : ReplayInputHandler
         where TFrame : ReplayFrame
     {
-        private readonly Replay replay;
+        /// <summary>
+        /// Whether we have at least one replay frame.
+        /// </summary>
+        public bool HasFrames => Frames.Count != 0;
 
-        protected List<ReplayFrame> Frames => replay.Frames;
+        /// <summary>
+        /// Whether we are waiting for new frames to be received.
+        /// </summary>
+        public bool WaitingForFrame => !replay.HasReceivedAllFrames && currentFrameIndex == Frames.Count - 1;
 
-        public TFrame CurrentFrame
-        {
-            get
-            {
-                if (!HasFrames || !currentFrameIndex.HasValue)
-                    return null;
+        /// <summary>
+        /// The current frame of the replay.
+        /// The current time is always between the start and the end time of the current frame.
+        /// </summary>
+        /// <remarks>Returns null if the current time is strictly before the first frame.</remarks>
+        public TFrame? CurrentFrame => currentFrameIndex == -1 ? null : (TFrame)Frames[currentFrameIndex];
 
-                return (TFrame)Frames[currentFrameIndex.Value];
-            }
-        }
+        /// <summary>
+        /// The next frame of the replay.
+        /// The start time of <see cref="NextFrame"/> is always greater or equal to the start time of <see cref="CurrentFrame"/> regardless of the seeking direction.
+        /// </summary>
+        /// <remarks>Returns null if the current frame is the last frame.</remarks>
+        public TFrame? NextFrame => currentFrameIndex == Frames.Count - 1 ? null : (TFrame)Frames[currentFrameIndex + 1];
 
-        public TFrame NextFrame
+        /// <summary>
+        /// The frame for the start value of the interpolation of the replay movement.
+        /// </summary>
+        /// <exception cref="InvalidOperationException">The replay is empty.</exception>
+        public TFrame StartFrame
         {
             get
             {
                 if (!HasFrames)
-                    return null;
+                    throw new InvalidOperationException($"Attempted to get {nameof(StartFrame)} of an empty replay");
 
-                if (!currentFrameIndex.HasValue)
-                    return currentDirection > 0 ? (TFrame)Frames[0] : null;
-
-                int nextFrame = clampedNextFrameIndex;
-
-                if (nextFrame == currentFrameIndex.Value)
-                    return null;
-
-                return (TFrame)Frames[clampedNextFrameIndex];
+                return (TFrame)Frames[Math.Max(0, currentFrameIndex)];
             }
         }
 
-        private int? currentFrameIndex;
-
-        private int clampedNextFrameIndex =>
-            currentFrameIndex.HasValue ? Math.Clamp(currentFrameIndex.Value + currentDirection, 0, Frames.Count - 1) : 0;
-
-        protected FramedReplayInputHandler(Replay replay)
+        /// <summary>
+        /// The frame for the end value of the interpolation of the replay movement.
+        /// </summary>
+        /// <exception cref="InvalidOperationException">The replay is empty.</exception>
+        public TFrame EndFrame
         {
-            this.replay = replay;
+            get
+            {
+                if (!HasFrames)
+                    throw new InvalidOperationException($"Attempted to get {nameof(EndFrame)} of an empty replay");
+
+                return (TFrame)Frames[Math.Min(currentFrameIndex + 1, Frames.Count - 1)];
+            }
         }
 
-        private const double sixty_frame_time = 1000.0 / 60;
-
-        protected virtual double AllowedImportantTimeSpan => sixty_frame_time * 1.2;
-
-        protected double? CurrentTime { get; private set; }
-
-        private int currentDirection = 1;
-
         /// <summary>
         /// When set, we will ensure frames executed by nested drawables are frame-accurate to replay data.
         /// Disabling this can make replay playback smoother (useful for autoplay, currently).
         /// </summary>
         public bool FrameAccuratePlayback;
 
-        public bool HasFrames => Frames.Count > 0;
+        // This input handler should be enabled only if there is at least one replay frame.
+        public override bool IsActive => HasFrames;
+
+        protected double CurrentTime { get; private set; }
+
+        protected virtual double AllowedImportantTimeSpan => sixty_frame_time * 1.2;
+
+        protected List<ReplayFrame> Frames => replay.Frames;
+
+        private readonly Replay replay;
+
+        private int currentFrameIndex;
+
+        private const double sixty_frame_time = 1000.0 / 60;
+
+        protected FramedReplayInputHandler(Replay replay)
+        {
+            // TODO: This replay frame ordering should be enforced on the Replay type.
+            // Currently, the ordering can be broken if the frames are added after this construction.
+            replay.Frames.Sort((x, y) => x.Time.CompareTo(y.Time));
+
+            this.replay = replay;
+            currentFrameIndex = -1;
+            CurrentTime = double.NegativeInfinity;
+        }
 
         private bool inImportantSection
         {
             get
             {
-                if (!HasFrames || !FrameAccuratePlayback)
+                if (!HasFrames || !FrameAccuratePlayback || currentFrameIndex == -1)
                     return false;
 
-                var frame = currentDirection > 0 ? CurrentFrame : NextFrame;
-
-                if (frame == null)
-                    return false;
-
-                return IsImportant(frame) && // a button is in a pressed state
-                       Math.Abs(CurrentTime - NextFrame?.Time ?? 0) <= AllowedImportantTimeSpan; // the next frame is within an allowable time span
+                return IsImportant(StartFrame) && // a button is in a pressed state
+                       Math.Abs(CurrentTime - EndFrame.Time) <= AllowedImportantTimeSpan; // the next frame is within an allowable time span
             }
         }
 
@@ -105,71 +127,52 @@ namespace osu.Game.Rulesets.Replays
         /// <returns>The usable time value. If null, we should not advance time as we do not have enough data.</returns>
         public override double? SetFrameFromTime(double time)
         {
-            updateDirection(time);
-
-            Debug.Assert(currentDirection != 0);
-
             if (!HasFrames)
             {
-                // in the case all frames are received, allow time to progress regardless.
+                // In the case all frames are received, allow time to progress regardless.
                 if (replay.HasReceivedAllFrames)
                     return CurrentTime = time;
 
                 return null;
             }
 
-            TFrame next = NextFrame;
+            double frameStart = getFrameTime(currentFrameIndex);
+            double frameEnd = getFrameTime(currentFrameIndex + 1);
 
-            // if we have a next frame, check if it is before or at the current time in playback, and advance time to it if so.
-            if (next != null)
+            // If the proposed time is after the current frame end time, we progress forwards to precisely the new frame's time (regardless of incoming time).
+            if (frameEnd <= time)
             {
-                int compare = time.CompareTo(next.Time);
-
-                if (compare == 0 || compare == currentDirection)
-                {
-                    currentFrameIndex = clampedNextFrameIndex;
-                    return CurrentTime = CurrentFrame.Time;
-                }
+                time = frameEnd;
+                currentFrameIndex++;
             }
+            // If the proposed time is before the current frame start time, and we are at the frame boundary, we progress backwards.
+            else if (time < frameStart && CurrentTime == frameStart)
+                currentFrameIndex--;
 
-            // at this point, the frame index can't be advanced.
-            // even so, we may be able to propose the clock progresses forward due to being at an extent of the replay,
-            // or moving towards the next valid frame (ie. interpolating in a non-important section).
+            frameStart = getFrameTime(currentFrameIndex);
+            frameEnd = getFrameTime(currentFrameIndex + 1);
 
-            // the exception is if currently in an important section, which is respected above all.
-            if (inImportantSection)
+            // Pause until more frames are arrived.
+            if (WaitingForFrame && frameStart < time)
             {
-                Debug.Assert(next != null || !replay.HasReceivedAllFrames);
+                CurrentTime = frameStart;
                 return null;
             }
 
-            // if a next frame does exist, allow interpolation.
-            if (next != null)
-                return CurrentTime = time;
+            CurrentTime = Math.Clamp(time, frameStart, frameEnd);
 
-            // if all frames have been received, allow playing beyond extents.
-            if (replay.HasReceivedAllFrames)
-                return CurrentTime = time;
-
-            // if not all frames are received but we are before the first frame, allow playing.
-            if (time < Frames[0].Time)
-                return CurrentTime = time;
-
-            // in the case we have no next frames and haven't received enough frame data, block.
-            return null;
+            // In an important section, a mid-frame time cannot be used and a null is returned instead.
+            return inImportantSection && frameStart < time && time < frameEnd ? null : (double?)CurrentTime;
         }
 
-        private void updateDirection(double time)
+        private double getFrameTime(int index)
         {
-            if (!CurrentTime.HasValue)
-            {
-                currentDirection = 1;
-            }
-            else
-            {
-                currentDirection = time.CompareTo(CurrentTime);
-                if (currentDirection == 0) currentDirection = 1;
-            }
+            if (index < 0)
+                return double.NegativeInfinity;
+            if (index >= Frames.Count)
+                return double.PositiveInfinity;
+
+            return Frames[index].Time;
         }
     }
 }

osu.Game/Rulesets/Ruleset.cs

@@ -201,6 +201,8 @@ namespace osu.Game.Rulesets
 
         public virtual HitObjectComposer CreateHitObjectComposer() => null;
 
+        public virtual IBeatmapVerifier CreateBeatmapVerifier() => null;
+
         public virtual Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.Solid.QuestionCircle };
 
         public virtual IResourceStore<byte[]> CreateResourceStore() => new NamespacedResourceStore<byte[]>(new DllResourceStore(GetType().Assembly), @"Resources");

osu.Game/Rulesets/Scoring/JudgementProcessor.cs

@@ -28,6 +28,8 @@ namespace osu.Game.Rulesets.Scoring
         /// </summary>
         public int JudgedHits { get; private set; }
 
+        private JudgementResult lastAppliedResult;
+
         private readonly BindableBool hasCompleted = new BindableBool();
 
         /// <summary>
@@ -53,12 +55,11 @@ namespace osu.Game.Rulesets.Scoring
         public void ApplyResult(JudgementResult result)
         {
             JudgedHits++;
+            lastAppliedResult = result;
 
             ApplyResultInternal(result);
 
             NewJudgement?.Invoke(result);
-
-            updateHasCompleted();
         }
 
         /// <summary>
@@ -69,8 +70,6 @@ namespace osu.Game.Rulesets.Scoring
         {
             JudgedHits--;
 
-            updateHasCompleted();
-
             RevertResultInternal(result);
         }
 
@@ -134,6 +133,10 @@ namespace osu.Game.Rulesets.Scoring
             }
         }
 
-        private void updateHasCompleted() => hasCompleted.Value = JudgedHits == MaxHits;
+        protected override void Update()
+        {
+            base.Update();
+            hasCompleted.Value = JudgedHits == MaxHits && (JudgedHits == 0 || lastAppliedResult.TimeAbsolute < Clock.CurrentTime);
+        }
     }
 }

osu.Game/Rulesets/UI/Playfield.cs

@@ -66,7 +66,7 @@ namespace osu.Game.Rulesets.UI
 
                 var enumerable = HitObjectContainer.Objects;
 
-                if (nestedPlayfields.IsValueCreated)
+                if (nestedPlayfields.Count != 0)
                     enumerable = enumerable.Concat(NestedPlayfields.SelectMany(p => p.AllHitObjects));
 
                 return enumerable;
@@ -76,9 +76,9 @@ namespace osu.Game.Rulesets.UI
         /// <summary>
         /// All <see cref="Playfield"/>s nested inside this <see cref="Playfield"/>.
         /// </summary>
-        public IEnumerable<Playfield> NestedPlayfields => nestedPlayfields.IsValueCreated ? nestedPlayfields.Value : Enumerable.Empty<Playfield>();
+        public IEnumerable<Playfield> NestedPlayfields => nestedPlayfields;
 
-        private readonly Lazy<List<Playfield>> nestedPlayfields = new Lazy<List<Playfield>>();
+        private readonly List<Playfield> nestedPlayfields = new List<Playfield>();
 
         /// <summary>
         /// Whether judgements should be displayed by this and and all nested <see cref="Playfield"/>s.
@@ -217,7 +217,7 @@ namespace osu.Game.Rulesets.UI
             otherPlayfield.HitObjectUsageBegan += h => HitObjectUsageBegan?.Invoke(h);
             otherPlayfield.HitObjectUsageFinished += h => HitObjectUsageFinished?.Invoke(h);
 
-            nestedPlayfields.Value.Add(otherPlayfield);
+            nestedPlayfields.Add(otherPlayfield);
         }
 
         protected override void LoadComplete()
@@ -279,12 +279,7 @@ namespace osu.Game.Rulesets.UI
                 return true;
             }
 
-            bool removedFromNested = false;
-
-            if (nestedPlayfields.IsValueCreated)
-                removedFromNested = nestedPlayfields.Value.Any(p => p.Remove(hitObject));
-
-            return removedFromNested;
+            return nestedPlayfields.Any(p => p.Remove(hitObject));
         }
 
         /// <summary>
@@ -429,10 +424,7 @@ namespace osu.Game.Rulesets.UI
                 return;
             }
 
-            if (!nestedPlayfields.IsValueCreated)
-                return;
-
-            foreach (var p in nestedPlayfields.Value)
+            foreach (var p in nestedPlayfields)
                 p.SetKeepAlive(hitObject, keepAlive);
         }
 
@@ -444,10 +436,7 @@ namespace osu.Game.Rulesets.UI
             foreach (var (_, entry) in lifetimeEntryMap)
                 entry.KeepAlive = true;
 
-            if (!nestedPlayfields.IsValueCreated)
-                return;
-
-            foreach (var p in nestedPlayfields.Value)
+            foreach (var p in nestedPlayfields)
                 p.KeepAllAlive();
         }
 
@@ -461,10 +450,7 @@ namespace osu.Game.Rulesets.UI
             {
                 HitObjectContainer.PastLifetimeExtension = value;
 
-                if (!nestedPlayfields.IsValueCreated)
-                    return;
-
-                foreach (var nested in nestedPlayfields.Value)
+                foreach (var nested in nestedPlayfields)
                     nested.PastLifetimeExtension = value;
             }
         }
@@ -479,10 +465,7 @@ namespace osu.Game.Rulesets.UI
             {
                 HitObjectContainer.FutureLifetimeExtension = value;
 
-                if (!nestedPlayfields.IsValueCreated)
-                    return;
-
-                foreach (var nested in nestedPlayfields.Value)
+                foreach (var nested in nestedPlayfields)
                     nested.FutureLifetimeExtension = value;
             }
         }

osu.Game/Screens/Backgrounds/BackgroundScreenBeatmap.cs

@@ -27,9 +27,12 @@ namespace osu.Game.Screens.Backgrounds
         private WorkingBeatmap beatmap;
 
         /// <summary>
-        /// Whether or not user dim settings should be applied to this Background.
+        /// Whether or not user-configured settings relating to brightness of elements should be ignored.
         /// </summary>
-        public readonly Bindable<bool> EnableUserDim = new Bindable<bool>();
+        /// <remarks>
+        /// Beatmap background screens should not apply user settings by default.
+        /// </remarks>
+        public readonly Bindable<bool> IgnoreUserSettings = new Bindable<bool>(true);
 
         public readonly Bindable<bool> StoryboardReplacesBackground = new Bindable<bool>();
 
@@ -50,7 +53,7 @@ namespace osu.Game.Screens.Backgrounds
 
             InternalChild = dimmable = CreateFadeContainer();
 
-            dimmable.EnableUserDim.BindTo(EnableUserDim);
+            dimmable.IgnoreUserSettings.BindTo(IgnoreUserSettings);
             dimmable.IsBreakTime.BindTo(IsBreakTime);
             dimmable.BlurAmount.BindTo(BlurAmount);
 
@@ -148,7 +151,7 @@ namespace osu.Game.Screens.Backgrounds
             /// <summary>
             /// As an optimisation, we add the two blur portions to be applied rather than actually applying two separate blurs.
             /// </summary>
-            private Vector2 blurTarget => EnableUserDim.Value
+            private Vector2 blurTarget => !IgnoreUserSettings.Value
                 ? new Vector2(BlurAmount.Value + (float)userBlurLevel.Value * USER_BLUR_FACTOR)
                 : new Vector2(BlurAmount.Value);
 
@@ -166,7 +169,9 @@ namespace osu.Game.Screens.Backgrounds
                 BlurAmount.ValueChanged += _ => UpdateVisuals();
             }
 
-            protected override bool ShowDimContent => !ShowStoryboard.Value || !StoryboardReplacesBackground.Value; // The background needs to be hidden in the case of it being replaced by the storyboard
+            protected override bool ShowDimContent
+                // The background needs to be hidden in the case of it being replaced by the storyboard
+                => (!ShowStoryboard.Value && !IgnoreUserSettings.Value) || !StoryboardReplacesBackground.Value;
 
             protected override void UpdateVisuals()
             {

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/BreakPart.cs

@@ -28,7 +28,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
             }
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours) => Colour = colours.Yellow;
+            private void load(OsuColour colours) => Colour = colours.GreyCarmineLight;
         }
     }
 }

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/ControlPointVisualisation.cs

@@ -0,0 +1,30 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations;
+
+namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
+{
+    public class ControlPointVisualisation : PointVisualisation
+    {
+        protected readonly ControlPoint Point;
+
+        public ControlPointVisualisation(ControlPoint point)
+        {
+            Point = point;
+
+            Height = 0.25f;
+            Origin = Anchor.TopCentre;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            Colour = Point.GetRepresentingColour(colours);
+        }
+    }
+}

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/EffectPointVisualisation.cs

@@ -0,0 +1,72 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations;
+
+namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
+{
+    public class EffectPointVisualisation : CompositeDrawable
+    {
+        private readonly EffectControlPoint effect;
+        private Bindable<bool> kiai;
+
+        [Resolved]
+        private EditorBeatmap beatmap { get; set; }
+
+        [Resolved]
+        private OsuColour colours { get; set; }
+
+        public EffectPointVisualisation(EffectControlPoint point)
+        {
+            RelativePositionAxes = Axes.Both;
+            RelativeSizeAxes = Axes.Y;
+
+            effect = point;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            kiai = effect.KiaiModeBindable.GetBoundCopy();
+            kiai.BindValueChanged(_ =>
+            {
+                ClearInternal();
+
+                AddInternal(new ControlPointVisualisation(effect));
+
+                if (!kiai.Value)
+                    return;
+
+                var endControlPoint = beatmap.ControlPointInfo.EffectPoints.FirstOrDefault(c => c.Time > effect.Time && !c.KiaiMode);
+
+                // handle kiai duration
+                // eventually this will be simpler when we have control points with durations.
+                if (endControlPoint != null)
+                {
+                    RelativeSizeAxes = Axes.Both;
+                    Origin = Anchor.TopLeft;
+
+                    Width = (float)(endControlPoint.Time - effect.Time);
+
+                    AddInternal(new PointVisualisation
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Origin = Anchor.TopLeft,
+                        Width = 1,
+                        Height = 0.25f,
+                        Depth = float.MaxValue,
+                        Colour = effect.GetRepresentingColour(colours).Darken(0.5f),
+                    });
+                }
+            }, true);
+        }
+    }
+}

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/GroupVisualisation.cs

@@ -1,29 +1,33 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Graphics;
-using osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations;
-using osuTK.Graphics;
 
 namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
 {
-    public class GroupVisualisation : PointVisualisation
+    public class GroupVisualisation : CompositeDrawable
     {
+        [Resolved]
+        private OsuColour colours { get; set; }
+
         public readonly ControlPointGroup Group;
 
         private readonly IBindableList<ControlPoint> controlPoints = new BindableList<ControlPoint>();
 
-        [Resolved]
-        private OsuColour colours { get; set; }
-
         public GroupVisualisation(ControlPointGroup group)
-            : base(group.Time)
         {
+            RelativePositionAxes = Axes.X;
+
+            RelativeSizeAxes = Axes.Both;
+            Origin = Anchor.TopLeft;
+
             Group = group;
+            X = (float)group.Time;
         }
 
         protected override void LoadComplete()
@@ -33,13 +37,32 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
             controlPoints.BindTo(Group.ControlPoints);
             controlPoints.BindCollectionChanged((_, __) =>
             {
-                if (controlPoints.Count == 0)
-                {
-                    Colour = Color4.Transparent;
-                    return;
-                }
+                ClearInternal();
 
-                Colour = controlPoints.Any(c => c is TimingControlPoint) ? colours.YellowDark : colours.Green;
+                if (controlPoints.Count == 0)
+                    return;
+
+                foreach (var point in Group.ControlPoints)
+                {
+                    switch (point)
+                    {
+                        case TimingControlPoint _:
+                            AddInternal(new ControlPointVisualisation(point) { Y = 0, });
+                            break;
+
+                        case DifficultyControlPoint _:
+                            AddInternal(new ControlPointVisualisation(point) { Y = 0.25f, });
+                            break;
+
+                        case SampleControlPoint _:
+                            AddInternal(new ControlPointVisualisation(point) { Y = 0.5f, });
+                            break;
+
+                        case EffectControlPoint effect:
+                            AddInternal(new EffectPointVisualisation(effect) { Y = 0.75f });
+                            break;
+                    }
+                }
             }, true);
         }
     }

osu.Game/Screens/Edit/Components/Timelines/Summary/SummaryTimeline.cs

@@ -27,6 +27,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                     Anchor = Anchor.Centre,
                     Origin = Anchor.BottomCentre,
                     RelativeSizeAxes = Axes.Both,
+                    Y = -10,
                     Height = 0.35f
                 },
                 new BookmarkPart
@@ -38,6 +39,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                 },
                 new Container
                 {
+                    Name = "centre line",
                     RelativeSizeAxes = Axes.Both,
                     Colour = colours.Gray5,
                     Children = new Drawable[]
@@ -45,7 +47,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                         new Circle
                         {
                             Anchor = Anchor.CentreLeft,
-                            Origin = Anchor.CentreRight,
+                            Origin = Anchor.Centre,
                             Size = new Vector2(5)
                         },
                         new Box
@@ -59,7 +61,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                         new Circle
                         {
                             Anchor = Anchor.CentreRight,
-                            Origin = Anchor.CentreLeft,
+                            Origin = Anchor.Centre,
                             Size = new Vector2(5)
                         },
                     }
@@ -69,7 +71,7 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
                     RelativeSizeAxes = Axes.Both,
-                    Height = 0.25f
+                    Height = 0.10f
                 }
             };
         }

osu.Game/Screens/Edit/Components/Timelines/Summary/Visualisations/DurationVisualisation.cs

@@ -2,7 +2,6 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
 
 namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations
@@ -10,19 +9,15 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations
     /// <summary>
     /// Represents a spanning point on a timeline part.
     /// </summary>
-    public class DurationVisualisation : Container
+    public class DurationVisualisation : Circle
     {
         protected DurationVisualisation(double startTime, double endTime)
         {
-            Masking = true;
-            CornerRadius = 5;
-
             RelativePositionAxes = Axes.X;
             RelativeSizeAxes = Axes.Both;
+
             X = (float)startTime;
             Width = (float)(endTime - startTime);
-
-            AddInternal(new Box { RelativeSizeAxes = Axes.Both });
         }
     }
 }