Merge branch 'master' into multi-queueing-modes

.github/workflows/ci.yml

@@ -52,22 +52,29 @@ jobs:
 
   build-only-android:
     name: Build only (Android)
-    runs-on: windows-latest
+    runs-on: macos-latest
     timeout-minutes: 60
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
+      # Pin Xamarin.Android version to 11.2 for now to avoid build failures caused by a Xamarin-side regression.
+      # See: https://github.com/xamarin/xamarin-android/issues/6284
+      # This can be removed/reverted when the fix makes it to upstream and is deployed on github runners.
+      - name: Set default Xamarin SDK version
+        run: |
+            $VM_ASSETS/select-xamarin-sdk-v2.sh --mono=6.12 --android=11.2
+
       - name: Install .NET 5.0.x
         uses: actions/setup-dotnet@v1
         with:
           dotnet-version: "5.0.x"
 
-      - name: Setup MSBuild
-        uses: microsoft/setup-msbuild@v1
-
+      # Contrary to seemingly any other msbuild, msbuild running on macOS/Mono
+      # cannot accept .sln(f) files as arguments.
+      # Build just the main game for now.
       - name: Build
-        run: msbuild osu.Android.slnf /restore /p:Configuration=Debug
+        run: msbuild osu.Android/osu.Android.csproj /restore /p:Configuration=Debug
 
   build-only-ios:
     # While this workflow technically *can* run, it fails as iOS builds are blocked by multiple issues.

osu.Game.Rulesets.Catch.Tests/Editor/Checks/TestCheckBananaShowerGap.cs

@@ -0,0 +1,118 @@
+// 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.Catch.Edit.Checks;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Tests.Beatmaps;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor.Checks
+{
+    [TestFixture]
+    public class TestCheckBananaShowerGap
+    {
+        private CheckBananaShowerGap check;
+
+        [SetUp]
+        public void Setup()
+        {
+            check = new CheckBananaShowerGap();
+        }
+
+        [Test]
+        public void TestAllowedSpinnerGaps()
+        {
+            assertOk(mockBeatmap(250, 1000, 1250), DifficultyRating.Easy);
+            assertOk(mockBeatmap(250, 1000, 1250), DifficultyRating.Normal);
+            assertOk(mockBeatmap(125, 1000, 1250), DifficultyRating.Hard);
+            assertOk(mockBeatmap(125, 1000, 1125), DifficultyRating.Insane);
+            assertOk(mockBeatmap(62, 1000, 1125), DifficultyRating.Expert);
+            assertOk(mockBeatmap(62, 1000, 1125), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestDisallowedSpinnerGapStart()
+        {
+            assertTooShortSpinnerStart(mockBeatmap(249, 1000, 1250), DifficultyRating.Easy);
+            assertTooShortSpinnerStart(mockBeatmap(249, 1000, 1250), DifficultyRating.Normal);
+            assertTooShortSpinnerStart(mockBeatmap(124, 1000, 1250), DifficultyRating.Hard);
+            assertTooShortSpinnerStart(mockBeatmap(124, 1000, 1250), DifficultyRating.Insane);
+            assertTooShortSpinnerStart(mockBeatmap(61, 1000, 1250), DifficultyRating.Expert);
+            assertTooShortSpinnerStart(mockBeatmap(61, 1000, 1250), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestDisallowedSpinnerGapEnd()
+        {
+            assertTooShortSpinnerEnd(mockBeatmap(250, 1000, 1249), DifficultyRating.Easy);
+            assertTooShortSpinnerEnd(mockBeatmap(250, 1000, 1249), DifficultyRating.Normal);
+            assertTooShortSpinnerEnd(mockBeatmap(125, 1000, 1249), DifficultyRating.Hard);
+            assertTooShortSpinnerEnd(mockBeatmap(125, 1000, 1124), DifficultyRating.Insane);
+            assertTooShortSpinnerEnd(mockBeatmap(62, 1000, 1124), DifficultyRating.Expert);
+            assertTooShortSpinnerEnd(mockBeatmap(62, 1000, 1124), DifficultyRating.ExpertPlus);
+        }
+
+        [Test]
+        public void TestConsecutiveSpinners()
+        {
+            var spinnerConsecutiveBeatmap = new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new BananaShower { StartTime = 0, EndTime = 100, X = 0 },
+                    new BananaShower { StartTime = 101, EndTime = 200, X = 0 },
+                    new BananaShower { StartTime = 201, EndTime = 300, X = 0 }
+                }
+            };
+
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Easy);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Normal);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Hard);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Insane);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.Expert);
+            assertOk(spinnerConsecutiveBeatmap, DifficultyRating.ExpertPlus);
+        }
+
+        private Beatmap<HitObject> mockBeatmap(double bananaShowerStart, double bananaShowerEnd, double nextFruitStart)
+        {
+            return new Beatmap<HitObject>
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Fruit { StartTime = 0, X = 0 },
+                    new BananaShower { StartTime = bananaShowerStart, EndTime = bananaShowerEnd, X = 0 },
+                    new Fruit { StartTime = nextFruitStart, X = 0 }
+                }
+            };
+        }
+
+        private void assertOk(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            Assert.That(check.Run(context), Is.Empty);
+        }
+
+        private void assertTooShortSpinnerStart(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            var issues = check.Run(context).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.All(issue => issue.Template is CheckBananaShowerGap.IssueTemplateBananaShowerStartGap));
+        }
+
+        private void assertTooShortSpinnerEnd(IBeatmap beatmap, DifficultyRating difficultyRating)
+        {
+            var context = new BeatmapVerifierContext(beatmap, new TestWorkingBeatmap(beatmap), difficultyRating);
+            var issues = check.Run(context).ToList();
+
+            Assert.That(issues, Has.Count.EqualTo(1));
+            Assert.That(issues.All(issue => issue.Template is CheckBananaShowerGap.IssueTemplateBananaShowerEndGap));
+        }
+    }
+}

osu.Game.Rulesets.Catch.Tests/Mods/TestSceneCatchModNoScope.cs

@@ -0,0 +1,110 @@
+// 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 NUnit.Framework;
+using osu.Framework.Utils;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Timing;
+using osu.Game.Rulesets.Catch.Mods;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Rulesets.Catch.Tests.Mods
+{
+    public class TestSceneCatchModNoScope : ModTestScene
+    {
+        protected override Ruleset CreatePlayerRuleset() => new CatchRuleset();
+
+        [Test]
+        public void TestVisibleDuringBreak()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new CatchModNoScope
+                {
+                    HiddenComboCount = { Value = 0 },
+                },
+                Autoplay = true,
+                PassCondition = () => true,
+                Beatmap = new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 1000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 5000,
+                        }
+                    },
+                    Breaks = new List<BreakPeriod>
+                    {
+                        new BreakPeriod(2000, 4000),
+                    }
+                }
+            });
+
+            AddUntilStep("wait for catcher to hide", () => catcherAlphaAlmostEquals(0));
+            AddUntilStep("wait for start of break", isBreak);
+            AddUntilStep("wait for catcher to show", () => catcherAlphaAlmostEquals(1));
+            AddUntilStep("wait for end of break", () => !isBreak());
+            AddUntilStep("wait for catcher to hide", () => catcherAlphaAlmostEquals(0));
+        }
+
+        [Test]
+        public void TestVisibleAfterComboBreak()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new CatchModNoScope
+                {
+                    HiddenComboCount = { Value = 2 },
+                },
+                Autoplay = true,
+                PassCondition = () => true,
+                Beatmap = new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Fruit
+                        {
+                            X = 0,
+                            StartTime = 1000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X,
+                            StartTime = 3000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.WIDTH,
+                            StartTime = 5000,
+                        },
+                    }
+                }
+            });
+
+            AddAssert("catcher must start visible", () => catcherAlphaAlmostEquals(1));
+            AddUntilStep("wait for combo", () => Player.ScoreProcessor.Combo.Value >= 2);
+            AddAssert("catcher must dim after combo", () => !catcherAlphaAlmostEquals(1));
+            AddStep("break combo", () => Player.ScoreProcessor.Combo.Value = 0);
+            AddUntilStep("wait for catcher to show", () => catcherAlphaAlmostEquals(1));
+        }
+
+        private bool isBreak() => Player.IsBreakTime.Value;
+
+        private bool catcherAlphaAlmostEquals(float alpha)
+        {
+            var playfield = (CatchPlayfield)Player.DrawableRuleset.Playfield;
+            return Precision.AlmostEquals(playfield.CatcherArea.Alpha, alpha);
+        }
+    }
+}

osu.Game.Rulesets.Catch/CatchRuleset.cs

@@ -133,6 +133,7 @@ namespace osu.Game.Rulesets.Catch
                         new MultiMod(new ModWindUp(), new ModWindDown()),
                         new CatchModFloatingFruits(),
                         new CatchModMuted(),
+                        new CatchModNoScope(),
                     };
 
                 default:
@@ -188,5 +189,7 @@ namespace osu.Game.Rulesets.Catch
         public override IConvertibleReplayFrame CreateConvertibleReplayFrame() => new CatchReplayFrame();
 
         public override HitObjectComposer CreateHitObjectComposer() => new CatchHitObjectComposer(this);
+
+        public override IBeatmapVerifier CreateBeatmapVerifier() => new CatchBeatmapVerifier();
     }
 }

osu.Game.Rulesets.Catch/Edit/CatchBeatmapVerifier.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.Rulesets.Catch.Edit.Checks;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    public class CatchBeatmapVerifier : IBeatmapVerifier
+    {
+        private readonly List<ICheck> checks = new List<ICheck>
+        {
+            new CheckBananaShowerGap()
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            return checks.SelectMany(check => check.Run(context));
+        }
+    }
+}

osu.Game.Rulesets.Catch/Edit/Checks/CheckBananaShowerGap.cs

@@ -0,0 +1,102 @@
+// 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 osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Checks.Components;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Catch.Edit.Checks
+{
+    /// <summary>
+    /// Check the spinner/banana shower gaps specified in the osu!catch difficulty specific ranking criteria.
+    /// </summary>
+    public class CheckBananaShowerGap : ICheck
+    {
+        private static readonly Dictionary<DifficultyRating, (int startGap, int endGap)> spinner_delta_threshold = new Dictionary<DifficultyRating, (int, int)>
+        {
+            [DifficultyRating.Easy] = (250, 250),
+            [DifficultyRating.Normal] = (250, 250),
+            [DifficultyRating.Hard] = (125, 250),
+            [DifficultyRating.Insane] = (125, 125),
+            [DifficultyRating.Expert] = (62, 125),
+            [DifficultyRating.ExpertPlus] = (62, 125)
+        };
+
+        public CheckMetadata Metadata { get; } = new CheckMetadata(CheckCategory.Compose, "Too short spinner gap");
+
+        public IEnumerable<IssueTemplate> PossibleTemplates => new IssueTemplate[]
+        {
+            new IssueTemplateBananaShowerStartGap(this),
+            new IssueTemplateBananaShowerEndGap(this)
+        };
+
+        public IEnumerable<Issue> Run(BeatmapVerifierContext context)
+        {
+            var hitObjects = context.Beatmap.HitObjects;
+            (int expectedStartDelta, int expectedEndDelta) = spinner_delta_threshold[context.InterpretedDifficulty];
+
+            for (int i = 0; i < hitObjects.Count - 1; ++i)
+            {
+                if (!(hitObjects[i] is BananaShower bananaShower))
+                    continue;
+
+                // Skip if the previous hitobject is a banana shower, consecutive spinners are allowed
+                if (i != 0 && hitObjects[i - 1] is CatchHitObject previousHitObject && !(previousHitObject is BananaShower))
+                {
+                    double spinnerStartDelta = bananaShower.StartTime - previousHitObject.GetEndTime();
+
+                    if (spinnerStartDelta < expectedStartDelta)
+                    {
+                        yield return new IssueTemplateBananaShowerStartGap(this)
+                            .Create(spinnerStartDelta, expectedStartDelta, bananaShower, previousHitObject);
+                    }
+                }
+
+                // Skip if the next hitobject is a banana shower, consecutive spinners are allowed
+                if (hitObjects[i + 1] is CatchHitObject nextHitObject && !(nextHitObject is BananaShower))
+                {
+                    double spinnerEndDelta = nextHitObject.StartTime - bananaShower.EndTime;
+
+                    if (spinnerEndDelta < expectedEndDelta)
+                    {
+                        yield return new IssueTemplateBananaShowerEndGap(this)
+                            .Create(spinnerEndDelta, expectedEndDelta, bananaShower, nextHitObject);
+                    }
+                }
+            }
+        }
+
+        public abstract class IssueTemplateBananaShowerGap : IssueTemplate
+        {
+            protected IssueTemplateBananaShowerGap(ICheck check, IssueType issueType, string unformattedMessage)
+                : base(check, issueType, unformattedMessage)
+            {
+            }
+
+            public Issue Create(double deltaTime, int expectedDeltaTime, params HitObject[] hitObjects)
+            {
+                return new Issue(hitObjects, this, Math.Floor(deltaTime), expectedDeltaTime);
+            }
+        }
+
+        public class IssueTemplateBananaShowerStartGap : IssueTemplateBananaShowerGap
+        {
+            public IssueTemplateBananaShowerStartGap(ICheck check)
+                : base(check, IssueType.Problem, "There is only {0} ms between the start of the spinner and the last object, it should not be less than {1} ms.")
+            {
+            }
+        }
+
+        public class IssueTemplateBananaShowerEndGap : IssueTemplateBananaShowerGap
+        {
+            public IssueTemplateBananaShowerEndGap(ICheck check)
+                : base(check, IssueType.Problem, "There is only {0} ms between the end of the spinner and the next object, it should not be less than {1} ms.")
+            {
+            }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModNoScope.cs

@@ -0,0 +1,40 @@
+// 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 osu.Framework.Bindables;
+using osu.Game.Rulesets.Mods;
+using osu.Framework.Utils;
+using osu.Game.Configuration;
+using osu.Game.Overlays.Settings;
+using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.UI;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModNoScope : ModNoScope, IUpdatableByPlayfield
+    {
+        public override string Description => "Where's the catcher?";
+
+        [SettingSource(
+            "Hidden at combo",
+            "The combo count at which the catcher becomes completely hidden",
+            SettingControlType = typeof(SettingsSlider<int, HiddenComboSlider>)
+        )]
+        public override BindableInt HiddenComboCount { get; } = new BindableInt
+        {
+            Default = 10,
+            Value = 10,
+            MinValue = 0,
+            MaxValue = 50,
+        };
+
+        public void Update(Playfield playfield)
+        {
+            var catchPlayfield = (CatchPlayfield)playfield;
+            bool shouldAlwaysShowCatcher = IsBreakTime.Value;
+            float targetAlpha = shouldAlwaysShowCatcher ? 1 : ComboBasedAlpha;
+            catchPlayfield.CatcherArea.Alpha = (float)Interpolation.Lerp(catchPlayfield.CatcherArea.Alpha, targetAlpha, Math.Clamp(catchPlayfield.Time.Elapsed / TRANSITION_DURATION, 0, 1));
+        }
+    }
+}

osu.Game.Rulesets.Mania.Tests/Editor/TestSceneManiaComposeScreen.cs

@@ -22,6 +22,9 @@ namespace osu.Game.Rulesets.Mania.Tests.Editor
         [Resolved]
         private SkinManager skins { get; set; }
 
+        [Cached]
+        private EditorClipboard clipboard = new EditorClipboard();
+
         [SetUpSteps]
         public void SetUpSteps()
         {

osu.Game.Rulesets.Osu.Tests/Mods/TestSceneOsuModNoScope.cs

@@ -137,7 +137,7 @@ namespace osu.Game.Rulesets.Osu.Tests.Mods
             AddAssert("cursor must start visible", () => cursorAlphaAlmostEquals(1));
             AddUntilStep("wait for combo", () => Player.ScoreProcessor.Combo.Value >= 2);
             AddAssert("cursor must dim after combo", () => !cursorAlphaAlmostEquals(1));
-            AddStep("break combo", () => Player.ScoreProcessor.Combo.Set(0));
+            AddStep("break combo", () => Player.ScoreProcessor.Combo.Value = 0);
             AddUntilStep("wait for cursor to show", () => cursorAlphaAlmostEquals(1));
         }
 

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

@@ -4,52 +4,29 @@
 using System;
 using System.Linq;
 using osu.Framework.Bindables;
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Sprites;
-using osu.Framework.Localisation;
 using osu.Framework.Utils;
 using osu.Game.Beatmaps;
 using osu.Game.Configuration;
-using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays.Settings;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.UI;
-using osu.Game.Rulesets.Scoring;
-using osu.Game.Scoring;
-using osu.Game.Screens.Play;
 using osu.Game.Utils;
 
 namespace osu.Game.Rulesets.Osu.Mods
 {
-    public class OsuModNoScope : Mod, IUpdatableByPlayfield, IApplicableToScoreProcessor, IApplicableToPlayer, IApplicableToBeatmap
+    public class OsuModNoScope : ModNoScope, IUpdatableByPlayfield, IApplicableToBeatmap
     {
-        /// <summary>
-        /// Slightly higher than the cutoff for <see cref="Drawable.IsPresent"/>.
-        /// </summary>
-        private const float min_alpha = 0.0002f;
-
-        private const float transition_duration = 100;
-
-        public override string Name => "No Scope";
-        public override string Acronym => "NS";
-        public override ModType Type => ModType.Fun;
-        public override IconUsage? Icon => FontAwesome.Solid.EyeSlash;
         public override string Description => "Where's the cursor?";
-        public override double ScoreMultiplier => 1;
 
-        private BindableNumber<int> currentCombo;
-        private IBindable<bool> isBreakTime;
         private PeriodTracker spinnerPeriods;
 
-        private float comboBasedAlpha;
-
         [SettingSource(
             "Hidden at combo",
             "The combo count at which the cursor becomes completely hidden",
             SettingControlType = typeof(SettingsSlider<int, HiddenComboSlider>)
         )]
-        public BindableInt HiddenComboCount { get; } = new BindableInt
+        public override BindableInt HiddenComboCount { get; } = new BindableInt
         {
             Default = 10,
             Value = 10,
@@ -57,39 +34,16 @@ namespace osu.Game.Rulesets.Osu.Mods
             MaxValue = 50,
         };
 
-        public ScoreRank AdjustRank(ScoreRank rank, double accuracy) => rank;
-
-        public void ApplyToPlayer(Player player)
-        {
-            isBreakTime = player.IsBreakTime.GetBoundCopy();
-        }
-
         public void ApplyToBeatmap(IBeatmap beatmap)
         {
-            spinnerPeriods = new PeriodTracker(beatmap.HitObjects.OfType<Spinner>().Select(b => new Period(b.StartTime - transition_duration, b.EndTime)));
+            spinnerPeriods = new PeriodTracker(beatmap.HitObjects.OfType<Spinner>().Select(b => new Period(b.StartTime - TRANSITION_DURATION, b.EndTime)));
         }
 
-        public void ApplyToScoreProcessor(ScoreProcessor scoreProcessor)
+        public void Update(Playfield playfield)
         {
-            if (HiddenComboCount.Value == 0) return;
-
-            currentCombo = scoreProcessor.Combo.GetBoundCopy();
-            currentCombo.BindValueChanged(combo =>
-            {
-                comboBasedAlpha = Math.Max(min_alpha, 1 - (float)combo.NewValue / HiddenComboCount.Value);
-            }, true);
-        }
-
-        public virtual void Update(Playfield playfield)
-        {
-            bool shouldAlwaysShowCursor = isBreakTime.Value || spinnerPeriods.IsInAny(playfield.Clock.CurrentTime);
-            float targetAlpha = shouldAlwaysShowCursor ? 1 : comboBasedAlpha;
-            playfield.Cursor.Alpha = (float)Interpolation.Lerp(playfield.Cursor.Alpha, targetAlpha, Math.Clamp(playfield.Time.Elapsed / transition_duration, 0, 1));
+            bool shouldAlwaysShowCursor = IsBreakTime.Value || spinnerPeriods.IsInAny(playfield.Clock.CurrentTime);
+            float targetAlpha = shouldAlwaysShowCursor ? 1 : ComboBasedAlpha;
+            playfield.Cursor.Alpha = (float)Interpolation.Lerp(playfield.Cursor.Alpha, targetAlpha, Math.Clamp(playfield.Time.Elapsed / TRANSITION_DURATION, 0, 1));
         }
     }
-
-    public class HiddenComboSlider : OsuSliderBar<int>
-    {
-        public override LocalisableString TooltipText => Current.Value == 0 ? "always hidden" : base.TooltipText;
-    }
 }

osu.Game.Rulesets.Taiko.Tests/Editor/TestSceneEditorSaving.cs

@@ -51,7 +51,7 @@ namespace osu.Game.Rulesets.Taiko.Tests.Editor
                 editorBeatmap.BeatmapInfo.Metadata.Artist = "artist";
                 editorBeatmap.BeatmapInfo.Metadata.Title = "title";
             });
-            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.Version = "difficulty");
+            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName = "difficulty");
 
             checkMutations();
 
@@ -85,7 +85,7 @@ namespace osu.Game.Rulesets.Taiko.Tests.Editor
                 return Precision.AlmostEquals(taikoDifficulty.SliderMultiplier, 2);
             });
             AddAssert("Beatmap has correct metadata", () => editorBeatmap.BeatmapInfo.Metadata.Artist == "artist" && editorBeatmap.BeatmapInfo.Metadata.Title == "title");
-            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.Version == "difficulty");
+            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName == "difficulty");
         }
     }
 }

osu.Game.Tests/Beatmaps/Formats/LegacyBeatmapDecoderTest.cs

@@ -113,7 +113,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
                 Assert.AreEqual("Soleily", metadata.Artist);
                 Assert.AreEqual("Soleily", metadata.ArtistUnicode);
                 Assert.AreEqual("Gamu", metadata.Author.Username);
-                Assert.AreEqual("Insane", beatmapInfo.Version);
+                Assert.AreEqual("Insane", beatmapInfo.DifficultyName);
                 Assert.AreEqual(string.Empty, metadata.Source);
                 Assert.AreEqual("MBC7 Unisphere 地球ヤバイEP Chikyu Yabai", metadata.Tags);
                 Assert.AreEqual(557821, beatmapInfo.OnlineBeatmapID);

osu.Game.Tests/Beatmaps/IO/ImportBeatmapTest.cs

@@ -790,12 +790,12 @@ namespace osu.Game.Tests.Beatmaps.IO
                     // Update via the beatmap, not the beatmap info, to ensure correct linking
                     BeatmapSetInfo setToUpdate = manager.GetAllUsableBeatmapSets()[0];
                     Beatmap beatmapToUpdate = (Beatmap)manager.GetWorkingBeatmap(setToUpdate.Beatmaps.First(b => b.RulesetID == 0)).Beatmap;
-                    beatmapToUpdate.BeatmapInfo.Version = "updated";
+                    beatmapToUpdate.BeatmapInfo.DifficultyName = "updated";
 
                     manager.Update(setToUpdate);
 
                     BeatmapInfo updatedInfo = manager.QueryBeatmap(b => b.ID == beatmapToUpdate.BeatmapInfo.ID);
-                    Assert.That(updatedInfo.Version, Is.EqualTo("updated"));
+                    Assert.That(updatedInfo.DifficultyName, Is.EqualTo("updated"));
                 }
                 finally
                 {
@@ -863,7 +863,7 @@ namespace osu.Game.Tests.Beatmaps.IO
 
                     var beatmap = working.Beatmap;
 
-                    beatmap.BeatmapInfo.Version = "difficulty";
+                    beatmap.BeatmapInfo.DifficultyName = "difficulty";
                     beatmap.BeatmapInfo.Metadata = new BeatmapMetadata
                     {
                         Artist = "Artist/With\\Slashes",

osu.Game.Tests/Beatmaps/ToStringFormattingTest.cs

@@ -52,7 +52,7 @@ namespace osu.Game.Tests.Beatmaps
                     Title = "title",
                     Author = new APIUser { Username = "creator" }
                 },
-                Version = "difficulty"
+                DifficultyName = "difficulty"
             };
 
             Assert.That(beatmap.ToString(), Is.EqualTo("artist - title (creator) [difficulty]"));

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

@@ -54,7 +54,7 @@ namespace osu.Game.Tests.Editing.Checks
         {
             // While this is a problem, it is out of scope for this check and is caught by a different one.
             beatmap.Metadata.BackgroundFile = string.Empty;
-            var context = getContext(null, System.Array.Empty<byte>());
+            var context = getContext(null, new MemoryStream(System.Array.Empty<byte>()));
 
             Assert.That(check.Run(context), Is.Empty);
         }
@@ -103,7 +103,7 @@ namespace osu.Game.Tests.Editing.Checks
         [Test]
         public void TestTooUncompressed()
         {
-            var context = getContext(new Texture(1920, 1080), new byte[1024 * 1024 * 3]);
+            var context = getContext(new Texture(1920, 1080), new MemoryStream(new byte[1024 * 1024 * 3]));
 
             var issues = check.Run(context).ToList();
 
@@ -111,19 +111,32 @@ namespace osu.Game.Tests.Editing.Checks
             Assert.That(issues.Single().Template is CheckBackgroundQuality.IssueTemplateTooUncompressed);
         }
 
-        private BeatmapVerifierContext getContext(Texture background, [CanBeNull] byte[] fileBytes = null)
+        [Test]
+        public void TestStreamClosed()
         {
-            return new BeatmapVerifierContext(beatmap, getMockWorkingBeatmap(background, fileBytes).Object);
+            var background = new Texture(1920, 1080);
+            var stream = new Mock<MemoryStream>(new byte[1024 * 1024]);
+
+            var context = getContext(background, stream.Object);
+
+            Assert.That(check.Run(context), Is.Empty);
+
+            stream.Verify(x => x.Close(), Times.Once());
+        }
+
+        private BeatmapVerifierContext getContext(Texture background, [CanBeNull] Stream stream = null)
+        {
+            return new BeatmapVerifierContext(beatmap, getMockWorkingBeatmap(background, stream).Object);
         }
 
         /// <summary>
-        /// Returns the mock of the working beatmap with the given background and filesize.
+        /// Returns the mock of the working beatmap with the given background and its file stream.
         /// </summary>
         /// <param name="background">The texture of the background.</param>
-        /// <param name="fileBytes">The bytes that represent the background file.</param>
-        private Mock<IWorkingBeatmap> getMockWorkingBeatmap(Texture background, [CanBeNull] byte[] fileBytes = null)
+        /// <param name="stream">The stream representing the background file.</param>
+        private Mock<IWorkingBeatmap> getMockWorkingBeatmap(Texture background, [CanBeNull] Stream stream = null)
         {
-            var stream = new MemoryStream(fileBytes ?? new byte[1024 * 1024]);
+            stream ??= new MemoryStream(new byte[1024 * 1024]);
 
             var mock = new Mock<IWorkingBeatmap>();
             mock.SetupGet(w => w.Beatmap).Returns(beatmap);

osu.Game.Tests/Models/DisplayStringTest.cs

@@ -0,0 +1,124 @@
+// 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 Moq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Extensions;
+using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Rulesets;
+using osu.Game.Scoring;
+using osu.Game.Users;
+
+namespace osu.Game.Tests.Models
+{
+    [TestFixture]
+    public class DisplayStringTest
+    {
+        [Test]
+        public void TestBeatmapSet()
+        {
+            var mock = new Mock<IBeatmapSetInfo>();
+
+            mock.Setup(m => m.Metadata.Artist).Returns("artist");
+            mock.Setup(m => m.Metadata.Title).Returns("title");
+            mock.Setup(m => m.Metadata.Author.Username).Returns("author");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title (author)"));
+        }
+
+        [Test]
+        public void TestBeatmapSetWithNoAuthor()
+        {
+            var mock = new Mock<IBeatmapSetInfo>();
+
+            mock.Setup(m => m.Metadata.Artist).Returns("artist");
+            mock.Setup(m => m.Metadata.Title).Returns("title");
+            mock.Setup(m => m.Metadata.Author.Username).Returns(string.Empty);
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title"));
+        }
+
+        [Test]
+        public void TestBeatmapSetWithNoMetadata()
+        {
+            var mock = new Mock<IBeatmapSetInfo>();
+
+            mock.Setup(m => m.Metadata).Returns(new BeatmapMetadata());
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("unknown artist - unknown title"));
+        }
+
+        [Test]
+        public void TestBeatmap()
+        {
+            var mock = new Mock<IBeatmapInfo>();
+
+            mock.Setup(m => m.Metadata.Artist).Returns("artist");
+            mock.Setup(m => m.Metadata.Title).Returns("title");
+            mock.Setup(m => m.Metadata.Author.Username).Returns("author");
+            mock.Setup(m => m.DifficultyName).Returns("difficulty");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title (author) [difficulty]"));
+        }
+
+        [Test]
+        public void TestMetadata()
+        {
+            var mock = new Mock<IBeatmapMetadataInfo>();
+
+            mock.Setup(m => m.Artist).Returns("artist");
+            mock.Setup(m => m.Title).Returns("title");
+            mock.Setup(m => m.Author.Username).Returns("author");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("artist - title (author)"));
+        }
+
+        [Test]
+        public void TestScore()
+        {
+            var mock = new Mock<IScoreInfo>();
+
+            mock.Setup(m => m.User).Returns(new APIUser { Username = "user" }); // TODO: temporary.
+            mock.Setup(m => m.Beatmap.Metadata.Artist).Returns("artist");
+            mock.Setup(m => m.Beatmap.Metadata.Title).Returns("title");
+            mock.Setup(m => m.Beatmap.Metadata.Author.Username).Returns("author");
+            mock.Setup(m => m.Beatmap.DifficultyName).Returns("difficulty");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("user playing artist - title (author) [difficulty]"));
+        }
+
+        [Test]
+        public void TestRuleset()
+        {
+            var mock = new Mock<IRulesetInfo>();
+
+            mock.Setup(m => m.Name).Returns("ruleset");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("ruleset"));
+        }
+
+        [Test]
+        public void TestUser()
+        {
+            var mock = new Mock<IUser>();
+
+            mock.Setup(m => m.Username).Returns("user");
+
+            Assert.That(mock.Object.GetDisplayString(), Is.EqualTo("user"));
+        }
+
+        [Test]
+        public void TestFallback()
+        {
+            var fallback = new Fallback();
+
+            Assert.That(fallback.GetDisplayString(), Is.EqualTo("fallback"));
+        }
+
+        private class Fallback
+        {
+            public override string ToString() => "fallback";
+        }
+    }
+}

osu.Game.Tests/NonVisual/Filtering/FilterMatchingTest.cs

@@ -17,7 +17,7 @@ namespace osu.Game.Tests.NonVisual.Filtering
         private BeatmapInfo getExampleBeatmap() => new BeatmapInfo
         {
             Ruleset = new RulesetInfo { ID = 5 },
-            StarDifficulty = 4.0d,
+            StarRating = 4.0d,
             BaseDifficulty = new BeatmapDifficulty
             {
                 ApproachRate = 5.0f,
@@ -34,7 +34,7 @@ namespace osu.Game.Tests.NonVisual.Filtering
                 Source = "unit tests",
                 Tags = "look for tags too",
             },
-            Version = "version as well",
+            DifficultyName = "version as well",
             Length = 2500,
             BPM = 160,
             BeatDivisor = 12,

osu.Game.Tests/Online/TestSceneBeatmapManager.cs

@@ -5,6 +5,7 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Overlays.Notifications;
 using osu.Game.Tests.Visual;
 
@@ -16,7 +17,30 @@ namespace osu.Game.Tests.Online
         private BeatmapManager beatmaps;
         private ProgressNotification recentNotification;
 
-        private static readonly BeatmapSetInfo test_model = new BeatmapSetInfo { OnlineBeatmapSetID = 1 };
+        private static readonly BeatmapSetInfo test_db_model = new BeatmapSetInfo
+        {
+            OnlineBeatmapSetID = 1,
+            Metadata = new BeatmapMetadata
+            {
+                Artist = "test author",
+                Title = "test title",
+                Author = new APIUser
+                {
+                    Username = "mapper"
+                }
+            }
+        };
+
+        private static readonly APIBeatmapSet test_online_model = new APIBeatmapSet
+        {
+            OnlineID = 2,
+            Artist = "test author",
+            Title = "test title",
+            Author = new APIUser
+            {
+                Username = "mapper"
+            }
+        };
 
         [BackgroundDependencyLoader]
         private void load(BeatmapManager beatmaps)
@@ -26,25 +50,41 @@ namespace osu.Game.Tests.Online
             beatmaps.PostNotification = n => recentNotification = n as ProgressNotification;
         }
 
+        private static readonly object[][] notification_test_cases =
+        {
+            new object[] { test_db_model },
+            new object[] { test_online_model }
+        };
+
+        [TestCaseSource(nameof(notification_test_cases))]
+        public void TestNotificationMessage(IBeatmapSetInfo model)
+        {
+            AddStep("clear recent notification", () => recentNotification = null);
+            AddStep("download beatmap", () => beatmaps.Download(model));
+
+            AddUntilStep("wait for notification", () => recentNotification != null);
+            AddUntilStep("notification text correct", () => recentNotification.Text.ToString() == "Downloading test author - test title (mapper)");
+        }
+
         [Test]
         public void TestCancelDownloadFromRequest()
         {
-            AddStep("download beatmap", () => beatmaps.Download(test_model));
+            AddStep("download beatmap", () => beatmaps.Download(test_db_model));
 
-            AddStep("cancel download from request", () => beatmaps.GetExistingDownload(test_model).Cancel());
+            AddStep("cancel download from request", () => beatmaps.GetExistingDownload(test_db_model).Cancel());
 
-            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_model) == null);
+            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_db_model) == null);
             AddAssert("is notification cancelled", () => recentNotification.State == ProgressNotificationState.Cancelled);
         }
 
         [Test]
         public void TestCancelDownloadFromNotification()
         {
-            AddStep("download beatmap", () => beatmaps.Download(test_model));
+            AddStep("download beatmap", () => beatmaps.Download(test_db_model));
 
             AddStep("cancel download from notification", () => recentNotification.Close());
 
-            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_model) == null);
+            AddUntilStep("is removed from download list", () => beatmaps.GetExistingDownload(test_db_model) == null);
             AddAssert("is notification cancelled", () => recentNotification.State == ProgressNotificationState.Cancelled);
         }
     }

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

@@ -26,6 +26,9 @@ namespace osu.Game.Tests.Visual.Editing
                 }
             });
 
+        [Cached]
+        private EditorClipboard clipboard = new EditorClipboard();
+
         [BackgroundDependencyLoader]
         private void load()
         {

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

@@ -46,7 +46,7 @@ namespace osu.Game.Tests.Visual.Editing
                 editorBeatmap.BeatmapInfo.Metadata.Artist = "artist";
                 editorBeatmap.BeatmapInfo.Metadata.Title = "title";
             });
-            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.Version = "difficulty");
+            AddStep("Set difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName = "difficulty");
 
             AddStep("Add timing point", () => editorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint()));
 
@@ -85,7 +85,7 @@ namespace osu.Game.Tests.Visual.Editing
             AddAssert("Beatmap contains single hitcircle", () => editorBeatmap.HitObjects.Count == 1);
             AddAssert("Beatmap has correct overall difficulty", () => editorBeatmap.Difficulty.OverallDifficulty == 7);
             AddAssert("Beatmap has correct metadata", () => editorBeatmap.BeatmapInfo.Metadata.Artist == "artist" && editorBeatmap.BeatmapInfo.Metadata.Title == "title");
-            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.Version == "difficulty");
+            AddAssert("Beatmap has correct difficulty name", () => editorBeatmap.BeatmapInfo.DifficultyName == "difficulty");
         }
     }
 }

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

@@ -175,7 +175,7 @@ namespace osu.Game.Tests.Visual.Gameplay
                     Id = 39828,
                     Username = @"WubWoofWolf",
                 }
-            }.CreateScoreInfo(rulesets);
+            }.CreateScoreInfo(rulesets, CreateBeatmap(new OsuRuleset().RulesetInfo).BeatmapInfo);
         }
 
         private class TestReplayDownloadButton : ReplayDownloadButton

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

@@ -59,7 +59,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 2.5
+                                                StarRating = 2.5
                                             }
                                         }.BeatmapInfo,
                                     }
@@ -82,7 +82,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 2.5,
+                                                StarRating = 2.5,
                                                 Metadata =
                                                 {
                                                     Artist = "very very very very very very very very very long artist",
@@ -111,7 +111,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 2.5
+                                                StarRating = 2.5
                                             }
                                         }.BeatmapInfo,
                                     }
@@ -124,7 +124,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                                         {
                                             BeatmapInfo =
                                             {
-                                                StarDifficulty = 4.5
+                                                StarRating = 4.5
                                             }
                                         }.BeatmapInfo,
                                     }

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

@@ -55,7 +55,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 {
                     Ruleset = new OsuRuleset().RulesetInfo,
                     OnlineBeatmapID = beatmapId,
-                    Version = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
+                    DifficultyName = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
                     Length = length,
                     BPM = bpm,
                     BaseDifficulty = new BeatmapDifficulty

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

@@ -31,8 +31,8 @@ namespace osu.Game.Tests.Visual.Multiplayer
             {
                 SelectedRoom.Value.Playlist.AddRange(new[]
                 {
-                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarDifficulty = min } } },
-                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarDifficulty = max } } },
+                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarRating = min } } },
+                    new PlaylistItem { Beatmap = { Value = new BeatmapInfo { StarRating = max } } },
                 });
             });
         }

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

@@ -10,6 +10,7 @@ using osu.Framework.Platform;
 using osu.Framework.Testing;
 using osu.Game.Beatmaps;
 using osu.Game.Database;
+using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Online.Multiplayer.MatchTypes.TeamVersus;
 using osu.Game.Online.Rooms;
 using osu.Game.Rulesets;
@@ -97,16 +98,24 @@ namespace osu.Game.Tests.Visual.Multiplayer
             });
 
             AddAssert("user on team 0", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 0);
+            AddStep("add another user", () => client.AddUser(new APIUser { Username = "otheruser", Id = 44 }));
 
-            AddStep("press button", () =>
+            AddStep("press own button", () =>
             {
                 InputManager.MoveMouseTo(multiplayerScreenStack.ChildrenOfType<TeamDisplay>().First());
                 InputManager.Click(MouseButton.Left);
             });
             AddAssert("user on team 1", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 1);
 
-            AddStep("press button", () => InputManager.Click(MouseButton.Left));
+            AddStep("press own button again", () => InputManager.Click(MouseButton.Left));
             AddAssert("user on team 0", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 0);
+
+            AddStep("press other user's button", () =>
+            {
+                InputManager.MoveMouseTo(multiplayerScreenStack.ChildrenOfType<TeamDisplay>().ElementAt(1));
+                InputManager.Click(MouseButton.Left);
+            });
+            AddAssert("user still on team 0", () => (client.Room?.Users.FirstOrDefault()?.MatchState as TeamVersusUserState)?.TeamID == 0);
         }
 
         [Test]
@@ -127,9 +136,13 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             AddAssert("room type is head to head", () => client.Room?.Settings.MatchType == MatchType.HeadToHead);
 
+            AddUntilStep("team displays are not displaying teams", () => multiplayerScreenStack.ChildrenOfType<TeamDisplay>().All(d => d.DisplayedTeam == null));
+
             AddStep("change to team vs", () => client.ChangeSettings(matchType: MatchType.TeamVersus));
 
             AddAssert("room type is team vs", () => client.Room?.Settings.MatchType == MatchType.TeamVersus);
+
+            AddUntilStep("team displays are displaying teams", () => multiplayerScreenStack.ChildrenOfType<TeamDisplay>().All(d => d.DisplayedTeam != null));
         }
 
         private void createRoom(Func<Room> room)

osu.Game.Tests/Visual/SongSelect/TestSceneAdvancedStats.cs

@@ -46,7 +46,7 @@ namespace osu.Game.Tests.Visual.SongSelect
                 OverallDifficulty = 5.7f,
                 ApproachRate = 3.5f
             },
-            StarDifficulty = 4.5f
+            StarRating = 4.5f
         };
 
         [Test]
@@ -76,7 +76,7 @@ namespace osu.Game.Tests.Visual.SongSelect
                     OverallDifficulty = 4.5f,
                     ApproachRate = 3.1f
                 },
-                StarDifficulty = 8
+                StarRating = 8
             });
 
             AddAssert("first bar text is Key Count", () => advancedStats.ChildrenOfType<SpriteText>().First().Text == "Key Count");

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapCarousel.cs

@@ -435,8 +435,8 @@ namespace osu.Game.Tests.Visual.SongSelect
             for (int i = 0; i < 3; i++)
             {
                 var set = createTestBeatmapSet(i);
-                set.Beatmaps[0].StarDifficulty = 3 - i;
-                set.Beatmaps[2].StarDifficulty = 6 + i;
+                set.Beatmaps[0].StarRating = 3 - i;
+                set.Beatmaps[2].StarRating = 6 + i;
                 sets.Add(set);
             }
 
@@ -684,9 +684,9 @@ namespace osu.Game.Tests.Visual.SongSelect
                 {
                     set.Beatmaps.Add(new BeatmapInfo
                     {
-                        Version = $"Stars: {i}",
+                        DifficultyName = $"Stars: {i}",
                         Ruleset = new OsuRuleset().RulesetInfo,
-                        StarDifficulty = i,
+                        StarRating = i,
                     });
                 }
 
@@ -868,8 +868,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                 yield return new BeatmapInfo
                 {
                     OnlineBeatmapID = id++ * 10,
-                    Version = version,
-                    StarDifficulty = diff,
+                    DifficultyName = version,
+                    StarRating = diff,
                     Ruleset = new OsuRuleset().RulesetInfo,
                     BaseDifficulty = new BeatmapDifficulty
                     {
@@ -902,9 +902,9 @@ namespace osu.Game.Tests.Visual.SongSelect
                 {
                     OnlineBeatmapID = b * 10,
                     Path = $"extra{b}.osu",
-                    Version = $"Extra {b}",
+                    DifficultyName = $"Extra {b}",
                     Ruleset = rulesets.GetRuleset((b - 1) % 4),
-                    StarDifficulty = 2,
+                    StarRating = 2,
                     BaseDifficulty = new BeatmapDifficulty
                     {
                         OverallDifficulty = 3.5f,

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapInfoWedge.cs

@@ -198,8 +198,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                         Title = $"{ruleset.ShortName}Title"
                     },
                     Ruleset = ruleset,
-                    StarDifficulty = 6,
-                    Version = $"{ruleset.ShortName}Version",
+                    StarRating = 6,
+                    DifficultyName = $"{ruleset.ShortName}Version",
                     BaseDifficulty = new BeatmapDifficulty()
                 },
                 HitObjects = objects
@@ -219,7 +219,7 @@ namespace osu.Game.Tests.Visual.SongSelect
                         Source = "Verrrrry long Source",
                         Title = "Verrrrry long Title"
                     },
-                    Version = "Verrrrrrrrrrrrrrrrrrrrrrrrrrrrry long Version",
+                    DifficultyName = "Verrrrrrrrrrrrrrrrrrrrrrrrrrrrry long Version",
                     Status = BeatmapSetOnlineStatus.Graveyard,
                 },
             };

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapMetadataDisplay.cs

@@ -45,8 +45,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                     {
                         Title = title,
                     },
-                    Version = version,
-                    StarDifficulty = RNG.NextDouble(0, 10),
+                    DifficultyName = version,
+                    StarRating = RNG.NextDouble(0, 10),
                 }
             }));
         }
@@ -64,8 +64,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                     {
                         Title = "Heavy beatmap",
                     },
-                    Version = "10k objects",
-                    StarDifficulty = 99.99f,
+                    DifficultyName = "10k objects",
+                    StarRating = 99.99f,
                 }
             }));
 

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapRecommendations.cs

@@ -188,8 +188,8 @@ namespace osu.Game.Tests.Visual.SongSelect
                     Metadata = metadata,
                     BaseDifficulty = new BeatmapDifficulty(),
                     Ruleset = ruleset,
-                    StarDifficulty = difficultyIndex + 1,
-                    Version = $"SR{difficultyIndex + 1}"
+                    StarRating = difficultyIndex + 1,
+                    DifficultyName = $"SR{difficultyIndex + 1}"
                 }).ToList()
             };
 

osu.Game.Tests/Visual/SongSelect/TestScenePlaySongSelect.cs

@@ -919,7 +919,7 @@ namespace osu.Game.Tests.Visual.SongSelect
                 {
                     Ruleset = getRuleset(),
                     OnlineBeatmapID = beatmapId,
-                    Version = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
+                    DifficultyName = $"{beatmapId} (length {TimeSpan.FromMilliseconds(length):m\\:ss}, bpm {bpm:0.#})",
                     Length = length,
                     BPM = bpm,
                     BaseDifficulty = new BeatmapDifficulty

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

@@ -69,7 +69,7 @@ namespace osu.Game.Tests.Visual.UserInterface
                                     Username = "TestAuthor"
                                 },
                             },
-                            Version = "Insane"
+                            DifficultyName = "Insane"
                         },
                     }
                 },

osu.Game/Beatmaps/Beatmap.cs

@@ -56,7 +56,7 @@ namespace osu.Game.Beatmaps
                     Title = @"Unknown",
                     AuthorString = @"Unknown Creator",
                 },
-                Version = @"Normal",
+                DifficultyName = @"Normal",
                 BaseDifficulty = Difficulty,
             };
         }

osu.Game/Beatmaps/BeatmapInfo.cs

@@ -134,12 +134,12 @@ namespace osu.Game.Beatmaps
         public double TimelineZoom { get; set; }
 
         // Metadata
-        public string Version { get; set; }
-
-        private string versionString => string.IsNullOrEmpty(Version) ? string.Empty : $"[{Version}]";
+        [Column("Version")]
+        public string DifficultyName { get; set; }
 
         [JsonProperty("difficulty_rating")]
-        public double StarDifficulty { get; set; }
+        [Column("StarDifficulty")]
+        public double StarRating { get; set; }
 
         /// <summary>
         /// Currently only populated for beatmap deletion. Use <see cref="ScoreManager"/> to query scores.
@@ -147,7 +147,7 @@ namespace osu.Game.Beatmaps
         public List<ScoreInfo> Scores { get; set; }
 
         [JsonIgnore]
-        public DifficultyRating DifficultyRating => BeatmapDifficultyCache.GetDifficultyRating(StarDifficulty);
+        public DifficultyRating DifficultyRating => BeatmapDifficultyCache.GetDifficultyRating(StarRating);
 
         public override string ToString() => this.GetDisplayTitle();
 
@@ -182,9 +182,6 @@ namespace osu.Game.Beatmaps
 
         #region Implementation of IBeatmapInfo
 
-        [JsonIgnore]
-        string IBeatmapInfo.DifficultyName => Version;
-
         [JsonIgnore]
         IBeatmapMetadataInfo IBeatmapInfo.Metadata => Metadata ?? BeatmapSet?.Metadata ?? new BeatmapMetadata();
 
@@ -197,9 +194,6 @@ namespace osu.Game.Beatmaps
         [JsonIgnore]
         IRulesetInfo IBeatmapInfo.Ruleset => Ruleset;
 
-        [JsonIgnore]
-        double IBeatmapInfo.StarRating => StarDifficulty;
-
         #endregion
     }
 }

osu.Game/Beatmaps/BeatmapInfoExtensions.cs

@@ -11,7 +11,7 @@ namespace osu.Game.Beatmaps
         /// <summary>
         /// A user-presentable display title representing this beatmap.
         /// </summary>
-        public static string GetDisplayTitle(this IBeatmapInfo beatmapInfo) => $"{beatmapInfo.Metadata} {getVersionString(beatmapInfo)}".Trim();
+        public static string GetDisplayTitle(this IBeatmapInfo beatmapInfo) => $"{beatmapInfo.Metadata.GetDisplayTitle()} {getVersionString(beatmapInfo)}".Trim();
 
         /// <summary>
         /// A user-presentable display title representing this beatmap, with localisation handling for potentially romanisable fields.

osu.Game/Beatmaps/BeatmapMetadataInfoExtensions.cs

@@ -27,8 +27,12 @@ namespace osu.Game.Beatmaps
         /// </summary>
         public static string GetDisplayTitle(this IBeatmapMetadataInfo metadataInfo)
         {
-            string author = string.IsNullOrEmpty(metadataInfo.Author.Username) ? string.Empty : $"({metadataInfo.Author})";
-            return $"{metadataInfo.Artist} - {metadataInfo.Title} {author}".Trim();
+            string author = string.IsNullOrEmpty(metadataInfo.Author.Username) ? string.Empty : $" ({metadataInfo.Author.Username})";
+
+            string artist = string.IsNullOrEmpty(metadataInfo.Artist) ? "unknown artist" : metadataInfo.Artist;
+            string title = string.IsNullOrEmpty(metadataInfo.Title) ? "unknown title" : metadataInfo.Title;
+
+            return $"{artist} - {title}{author}".Trim();
         }
 
         /// <summary>

osu.Game/Beatmaps/BeatmapModelManager.cs

@@ -215,7 +215,7 @@ namespace osu.Game.Beatmaps
                     var fileInfo = setInfo.Files.SingleOrDefault(f => string.Equals(f.Filename, beatmapInfo.Path, StringComparison.OrdinalIgnoreCase)) ?? new BeatmapSetFileInfo();
 
                     // metadata may have changed; update the path with the standard format.
-                    beatmapInfo.Path = GetValidFilename($"{metadata.Artist} - {metadata.Title} ({metadata.Author}) [{beatmapInfo.Version}].osu");
+                    beatmapInfo.Path = GetValidFilename($"{metadata.Artist} - {metadata.Title} ({metadata.Author}) [{beatmapInfo.DifficultyName}].osu");
 
                     beatmapInfo.MD5Hash = stream.ComputeMD5Hash();
 
@@ -407,7 +407,7 @@ namespace osu.Game.Beatmaps
                     beatmap.BeatmapInfo.Ruleset = ruleset;
 
                     // TODO: this should be done in a better place once we actually need to dynamically update it.
-                    beatmap.BeatmapInfo.StarDifficulty = ruleset?.CreateInstance().CreateDifficultyCalculator(new DummyConversionBeatmap(beatmap)).Calculate().StarRating ?? 0;
+                    beatmap.BeatmapInfo.StarRating = ruleset?.CreateInstance().CreateDifficultyCalculator(new DummyConversionBeatmap(beatmap)).Calculate().StarRating ?? 0;
                     beatmap.BeatmapInfo.Length = calculateLength(beatmap);
                     beatmap.BeatmapInfo.BPM = 60000 / beatmap.GetMostCommonBeatLength();
 

osu.Game/Beatmaps/BeatmapSetInfo.cs

@@ -38,7 +38,7 @@ namespace osu.Game.Beatmaps
         /// <summary>
         /// The maximum star difficulty of all beatmaps in this set.
         /// </summary>
-        public double MaxStarDifficulty => Beatmaps?.Max(b => b.StarDifficulty) ?? 0;
+        public double MaxStarDifficulty => Beatmaps?.Max(b => b.StarRating) ?? 0;
 
         /// <summary>
         /// The maximum playable length in milliseconds of all beatmaps in this set.

osu.Game/Beatmaps/DifficultyRecommender.cs

@@ -64,7 +64,7 @@ namespace osu.Game.Beatmaps
 
                 BeatmapInfo beatmapInfo = beatmaps.Where(b => b.Ruleset.Equals(r)).OrderBy(b =>
                 {
-                    double difference = b.StarDifficulty - recommendation;
+                    double difference = b.StarRating - recommendation;
                     return difference >= 0 ? difference * 2 : difference * -1; // prefer easier over harder
                 }).FirstOrDefault();
 

osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs

@@ -251,7 +251,7 @@ namespace osu.Game.Beatmaps.Formats
                     break;
 
                 case @"Version":
-                    beatmap.BeatmapInfo.Version = pair.Value;
+                    beatmap.BeatmapInfo.DifficultyName = pair.Value;
                     break;
 
                 case @"Source":

osu.Game/Beatmaps/Formats/LegacyBeatmapEncoder.cs

@@ -130,7 +130,7 @@ namespace osu.Game.Beatmaps.Formats
             writer.WriteLine(FormattableString.Invariant($"Artist: {beatmap.Metadata.Artist}"));
             if (!string.IsNullOrEmpty(beatmap.Metadata.ArtistUnicode)) writer.WriteLine(FormattableString.Invariant($"ArtistUnicode: {beatmap.Metadata.ArtistUnicode}"));
             writer.WriteLine(FormattableString.Invariant($"Creator: {beatmap.Metadata.Author.Username}"));
-            writer.WriteLine(FormattableString.Invariant($"Version: {beatmap.BeatmapInfo.Version}"));
+            writer.WriteLine(FormattableString.Invariant($"Version: {beatmap.BeatmapInfo.DifficultyName}"));
             if (!string.IsNullOrEmpty(beatmap.Metadata.Source)) writer.WriteLine(FormattableString.Invariant($"Source: {beatmap.Metadata.Source}"));
             if (!string.IsNullOrEmpty(beatmap.Metadata.Tags)) writer.WriteLine(FormattableString.Invariant($"Tags: {beatmap.Metadata.Tags}"));
             if (beatmap.BeatmapInfo.OnlineBeatmapID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapID: {beatmap.BeatmapInfo.OnlineBeatmapID}"));

osu.Game/Database/ArchiveModelManager.cs

@@ -15,6 +15,7 @@ using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
 using osu.Framework.Threading;
+using osu.Game.Extensions;
 using osu.Game.IO;
 using osu.Game.IO.Archives;
 using osu.Game.IPC;
@@ -192,7 +193,7 @@ namespace osu.Game.Database
             else
             {
                 notification.CompletionText = imported.Count == 1
-                    ? $"Imported {imported.First().Value}!"
+                    ? $"Imported {imported.First().Value.GetDisplayString()}!"
                     : $"Imported {imported.Count} {HumanisedModelName}s!";
 
                 if (imported.Count > 0 && PostImport != null)

osu.Game/Database/ModelDownloader.cs

@@ -8,6 +8,7 @@ using System.Threading.Tasks;
 using Humanizer;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
+using osu.Game.Extensions;
 using osu.Game.Online.API;
 using osu.Game.Overlays.Notifications;
 
@@ -50,7 +51,7 @@ namespace osu.Game.Database
 
             DownloadNotification notification = new DownloadNotification
             {
-                Text = $"Downloading {request.Model}",
+                Text = $"Downloading {request.Model.GetDisplayString()}",
             };
 
             request.DownloadProgressed += progress =>

osu.Game/Extensions/ModelExtensions.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 osu.Game.Beatmaps;
+using osu.Game.Rulesets;
+using osu.Game.Scoring;
+using osu.Game.Users;
+
+namespace osu.Game.Extensions
+{
+    public static class ModelExtensions
+    {
+        /// <summary>
+        /// Returns a user-facing string representing the <paramref name="model"/>.
+        /// </summary>
+        /// <remarks>
+        /// <para>
+        /// Non-interface types without special handling will fall back to <see cref="object.ToString()"/>.
+        /// </para>
+        /// <para>
+        /// Warning: This method is _purposefully_ not called <c>GetDisplayTitle()</c> like the others, because otherwise
+        /// extension method type inference rules cause this method to call itself and cause a stack overflow.
+        /// </para>
+        /// </remarks>
+        public static string GetDisplayString(this object model)
+        {
+            string result = null;
+
+            switch (model)
+            {
+                case IBeatmapSetInfo beatmapSetInfo:
+                    result = beatmapSetInfo.Metadata?.GetDisplayTitle();
+                    break;
+
+                case IBeatmapInfo beatmapInfo:
+                    result = beatmapInfo.GetDisplayTitle();
+                    break;
+
+                case IBeatmapMetadataInfo metadataInfo:
+                    result = metadataInfo.GetDisplayTitle();
+                    break;
+
+                case IScoreInfo scoreInfo:
+                    result = scoreInfo.GetDisplayTitle();
+                    break;
+
+                case IRulesetInfo rulesetInfo:
+                    result = rulesetInfo.Name;
+                    break;
+
+                case IUser user:
+                    result = user.Username;
+                    break;
+            }
+
+            // fallback in case none of the above happens to match.
+            result ??= model.ToString();
+            return result;
+        }
+    }
+}

osu.Game/Online/HubClientConnector.cs

@@ -4,6 +4,7 @@
 #nullable enable
 
 using System;
+using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.SignalR.Client;
@@ -161,9 +162,10 @@ namespace osu.Game.Online
                 builder.AddNewtonsoftJsonProtocol(options =>
                 {
                     options.PayloadSerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
-                    // TODO: This should only be required to be `TypeNameHandling.Auto`.
-                    // See usage in osu-server-spectator for further documentation as to why this is required.
-                    options.PayloadSerializerSettings.TypeNameHandling = TypeNameHandling.All;
+                    options.PayloadSerializerSettings.Converters = new List<JsonConverter>
+                    {
+                        new SignalRDerivedTypeWorkaroundJsonConverter(),
+                    };
                 });
             }
 

osu.Game/Online/Multiplayer/MatchRoomState.cs

@@ -16,7 +16,6 @@ namespace osu.Game.Online.Multiplayer
     [Serializable]
     [MessagePackObject]
     [Union(0, typeof(TeamVersusRoomState))] // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
-    // TODO: abstract breaks json serialisation. attention will be required for iOS support (unless we get messagepack AOT working instead).
     public abstract class MatchRoomState
     {
     }

osu.Game/Online/Multiplayer/MatchUserState.cs

@@ -16,7 +16,6 @@ namespace osu.Game.Online.Multiplayer
     [Serializable]
     [MessagePackObject]
     [Union(0, typeof(TeamVersusUserState))] // IMPORTANT: Add rules to SignalRUnionWorkaroundResolver for new derived types.
-    // TODO: abstract breaks json serialisation. attention will be required for iOS support (unless we get messagepack AOT working instead).
     public abstract class MatchUserState
     {
     }

osu.Game/Online/SignalRDerivedTypeWorkaroundJsonConverter.cs

@@ -0,0 +1,60 @@
+// 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.Linq;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace osu.Game.Online
+{
+    /// <summary>
+    /// A type of <see cref="JsonConverter"/> that serializes a subset of types used in multiplayer/spectator communication that
+    /// derive from a known base type. This is a safe alternative to using <see cref="TypeNameHandling.Auto"/> or <see cref="TypeNameHandling.All"/>,
+    /// which are known to have security issues.
+    /// </summary>
+    public class SignalRDerivedTypeWorkaroundJsonConverter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType) =>
+            SignalRUnionWorkaroundResolver.BASE_TYPES.Contains(objectType) ||
+            SignalRUnionWorkaroundResolver.DERIVED_TYPES.Contains(objectType);
+
+        public override object? ReadJson(JsonReader reader, Type objectType, object? o, JsonSerializer jsonSerializer)
+        {
+            if (reader.TokenType == JsonToken.Null)
+                return null;
+
+            JObject obj = JObject.Load(reader);
+
+            string type = (string)obj[@"$dtype"]!;
+
+            var resolvedType = SignalRUnionWorkaroundResolver.DERIVED_TYPES.Single(t => t.Name == type);
+
+            object? instance = Activator.CreateInstance(resolvedType);
+
+            jsonSerializer.Populate(obj["$value"]!.CreateReader(), instance);
+
+            return instance;
+        }
+
+        public override void WriteJson(JsonWriter writer, object? o, JsonSerializer serializer)
+        {
+            if (o == null)
+            {
+                writer.WriteNull();
+                return;
+            }
+
+            writer.WriteStartObject();
+
+            writer.WritePropertyName(@"$dtype");
+            serializer.Serialize(writer, o.GetType().Name);
+
+            writer.WritePropertyName(@"$value");
+            writer.WriteRawValue(JsonConvert.SerializeObject(o));
+
+            writer.WriteEndObject();
+        }
+    }
+}

osu.Game/Online/SignalRUnionWorkaroundResolver.cs

@@ -20,7 +20,22 @@ namespace osu.Game.Online
         public static readonly MessagePackSerializerOptions OPTIONS =
             MessagePackSerializerOptions.Standard.WithResolver(new SignalRUnionWorkaroundResolver());
 
-        private static readonly Dictionary<Type, IMessagePackFormatter> formatter_map = new Dictionary<Type, IMessagePackFormatter>
+        public static readonly IReadOnlyList<Type> BASE_TYPES = new[]
+        {
+            typeof(MatchServerEvent),
+            typeof(MatchUserRequest),
+            typeof(MatchRoomState),
+            typeof(MatchUserState),
+        };
+
+        public static readonly IReadOnlyList<Type> DERIVED_TYPES = new[]
+        {
+            typeof(ChangeTeamRequest),
+            typeof(TeamVersusRoomState),
+            typeof(TeamVersusUserState),
+        };
+
+        private static readonly IReadOnlyDictionary<Type, IMessagePackFormatter> formatter_map = new Dictionary<Type, IMessagePackFormatter>
         {
             { typeof(TeamVersusUserState), new TypeRedirectingFormatter<TeamVersusUserState, MatchUserState>() },
             { typeof(TeamVersusRoomState), new TypeRedirectingFormatter<TeamVersusRoomState, MatchRoomState>() },

osu.Game/Overlays/Notifications/ProgressNotification.cs

@@ -23,9 +23,16 @@ namespace osu.Game.Overlays.Notifications
     {
         private const float loading_spinner_size = 22;
 
+        private LocalisableString text;
+
         public LocalisableString Text
         {
-            set => Schedule(() => textDrawable.Text = value);
+            get => text;
+            set
+            {
+                text = value;
+                Schedule(() => textDrawable.Text = text);
+            }
         }
 
         public string CompletionText { get; set; } = "Task has completed!";

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

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
+using System.IO;
 using osu.Game.Rulesets.Edit.Checks.Components;
 
 namespace osu.Game.Rulesets.Edit.Checks
@@ -48,11 +49,15 @@ namespace osu.Game.Rulesets.Edit.Checks
                 yield return new IssueTemplateLowResolution(this).Create(texture.Width, texture.Height);
 
             string storagePath = context.Beatmap.BeatmapInfo.BeatmapSet.GetPathForFile(backgroundFile);
-            double filesizeMb = context.WorkingBeatmap.GetStream(storagePath).Length / (1024d * 1024d);
+
+            using (Stream stream = context.WorkingBeatmap.GetStream(storagePath))
+            {
+                double filesizeMb = stream.Length / (1024d * 1024d);
 
                 if (filesizeMb > max_filesize_mb)
                     yield return new IssueTemplateTooUncompressed(this).Create(filesizeMb);
             }
+        }
 
         public class IssueTemplateTooHighResolution : IssueTemplate
         {

osu.Game/Rulesets/Mods/ModNoScope.cs

@@ -0,0 +1,62 @@
+// 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 osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Rulesets.Scoring;
+using osu.Game.Scoring;
+using osu.Game.Screens.Play;
+
+namespace osu.Game.Rulesets.Mods
+{
+    public abstract class ModNoScope : Mod, IApplicableToScoreProcessor, IApplicableToPlayer
+    {
+        public override string Name => "No Scope";
+        public override string Acronym => "NS";
+        public override ModType Type => ModType.Fun;
+        public override IconUsage? Icon => FontAwesome.Solid.EyeSlash;
+        public override double ScoreMultiplier => 1;
+
+        /// <summary>
+        /// Slightly higher than the cutoff for <see cref="Drawable.IsPresent"/>.
+        /// </summary>
+        protected const float MIN_ALPHA = 0.0002f;
+
+        protected const float TRANSITION_DURATION = 100;
+
+        protected BindableNumber<int> CurrentCombo;
+
+        protected IBindable<bool> IsBreakTime;
+
+        protected float ComboBasedAlpha;
+
+        public abstract BindableInt HiddenComboCount { get; }
+
+        public ScoreRank AdjustRank(ScoreRank rank, double accuracy) => rank;
+
+        public void ApplyToPlayer(Player player)
+        {
+            IsBreakTime = player.IsBreakTime.GetBoundCopy();
+        }
+
+        public void ApplyToScoreProcessor(ScoreProcessor scoreProcessor)
+        {
+            if (HiddenComboCount.Value == 0) return;
+
+            CurrentCombo = scoreProcessor.Combo.GetBoundCopy();
+            CurrentCombo.BindValueChanged(combo =>
+            {
+                ComboBasedAlpha = Math.Max(MIN_ALPHA, 1 - (float)combo.NewValue / HiddenComboCount.Value);
+            }, true);
+        }
+    }
+
+    public class HiddenComboSlider : OsuSliderBar<int>
+    {
+        public override LocalisableString TooltipText => Current.Value == 0 ? "always hidden" : base.TooltipText;
+    }
+}

osu.Game/Rulesets/RulesetLoadException.cs

@@ -0,0 +1,15 @@
+// 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;
+
+namespace osu.Game.Rulesets
+{
+    public class RulesetLoadException : Exception
+    {
+        public RulesetLoadException(string message)
+            : base(@$"Ruleset could not be loaded ({message})")
+        {
+        }
+    }
+}

osu.Game/Rulesets/RulesetStore.cs

@@ -7,7 +7,6 @@ using System.IO;
 using System.Linq;
 using System.Reflection;
 using osu.Framework;
-using osu.Framework.Extensions.ObjectExtensions;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
 using osu.Game.Database;
@@ -129,12 +128,15 @@ namespace osu.Game.Rulesets
                 {
                     try
                     {
-                        var instanceInfo = ((Ruleset)Activator.CreateInstance(Type.GetType(r.InstantiationInfo).AsNonNull())).RulesetInfo;
+                        var resolvedType = Type.GetType(r.InstantiationInfo)
+                                           ?? throw new RulesetLoadException(@"Type could not be resolved");
+
+                        var instanceInfo = (Activator.CreateInstance(resolvedType) as Ruleset)?.RulesetInfo
+                                           ?? throw new RulesetLoadException(@"Instantiation failure");
 
                         r.Name = instanceInfo.Name;
                         r.ShortName = instanceInfo.ShortName;
                         r.InstantiationInfo = instanceInfo.InstantiationInfo;
-
                         r.Available = true;
                     }
                     catch

osu.Game/Scoring/ScoreInfo.cs

@@ -225,7 +225,7 @@ namespace osu.Game.Scoring
             return clone;
         }
 
-        public override string ToString() => $"{User} playing {BeatmapInfo}";
+        public override string ToString() => this.GetDisplayTitle();
 
         public bool Equals(ScoreInfo other)
         {

osu.Game/Scoring/ScoreInfoExtensions.cs

@@ -0,0 +1,15 @@
+// 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.Game.Beatmaps;
+
+namespace osu.Game.Scoring
+{
+    public static class ScoreInfoExtensions
+    {
+        /// <summary>
+        /// A user-presentable display title representing this score.
+        /// </summary>
+        public static string GetDisplayTitle(this IScoreInfo scoreInfo) => $"{scoreInfo.User.Username} playing {scoreInfo.Beatmap.GetDisplayTitle()}";
+    }
+}

osu.Game/Screens/Edit/Components/Menus/DifficultyMenuItem.cs

@@ -13,7 +13,7 @@ namespace osu.Game.Screens.Edit.Components.Menus
         public BeatmapInfo BeatmapInfo { get; }
 
         public DifficultyMenuItem(BeatmapInfo beatmapInfo, bool selected, Action<BeatmapInfo> difficultyChangeFunc)
-            : base(beatmapInfo.Version ?? "(unnamed)", null)
+            : base(beatmapInfo.DifficultyName ?? "(unnamed)", null)
         {
             BeatmapInfo = beatmapInfo;
             State.Value = selected;

osu.Game/Screens/Edit/Compose/ComposeScreen.cs

@@ -7,29 +7,26 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Framework.Input;
-using osu.Framework.Input.Bindings;
-using osu.Framework.Input.Events;
 using osu.Framework.Platform;
 using osu.Game.Beatmaps;
 using osu.Game.Extensions;
+using osu.Game.IO.Serialization;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Screens.Edit.Compose.Components.Timeline;
 
 namespace osu.Game.Screens.Edit.Compose
 {
-    public class ComposeScreen : EditorScreenWithTimeline, IKeyBindingHandler<PlatformAction>
+    public class ComposeScreen : EditorScreenWithTimeline
     {
-        [Resolved]
-        private IBindable<WorkingBeatmap> beatmap { get; set; }
-
         [Resolved]
         private GameHost host { get; set; }
 
         [Resolved]
         private EditorClock clock { get; set; }
 
+        private Bindable<string> clipboard { get; set; }
+
         private HitObjectComposer composer;
 
         public ComposeScreen()
@@ -76,18 +73,65 @@ namespace osu.Game.Screens.Edit.Compose
             return new EditorSkinProvidingContainer(EditorBeatmap).WithChild(content);
         }
 
-        #region Input Handling
-
-        public bool OnPressed(KeyBindingPressEvent<PlatformAction> e)
+        [BackgroundDependencyLoader]
+        private void load(EditorClipboard clipboard)
         {
-            if (e.Action == PlatformAction.Copy)
-                host.GetClipboard()?.SetText(formatSelectionAsString());
-
-            return false;
+            this.clipboard = clipboard.Content.GetBoundCopy();
         }
 
-        public void OnReleased(KeyBindingReleaseEvent<PlatformAction> e)
+        protected override void LoadComplete()
         {
+            base.LoadComplete();
+            EditorBeatmap.SelectedHitObjects.BindCollectionChanged((_, __) => updateClipboardActionAvailability());
+            clipboard.BindValueChanged(_ => updateClipboardActionAvailability(), true);
+        }
+
+        #region Clipboard operations
+
+        protected override void PerformCut()
+        {
+            base.PerformCut();
+
+            Copy();
+            EditorBeatmap.RemoveRange(EditorBeatmap.SelectedHitObjects.ToArray());
+        }
+
+        protected override void PerformCopy()
+        {
+            base.PerformCopy();
+
+            clipboard.Value = new ClipboardContent(EditorBeatmap).Serialize();
+
+            host.GetClipboard()?.SetText(formatSelectionAsString());
+        }
+
+        protected override void PerformPaste()
+        {
+            base.PerformPaste();
+
+            var objects = clipboard.Value.Deserialize<ClipboardContent>().HitObjects;
+
+            Debug.Assert(objects.Any());
+
+            double timeOffset = clock.CurrentTime - objects.Min(o => o.StartTime);
+
+            foreach (var h in objects)
+                h.StartTime += timeOffset;
+
+            EditorBeatmap.BeginChange();
+
+            EditorBeatmap.SelectedHitObjects.Clear();
+
+            EditorBeatmap.AddRange(objects);
+            EditorBeatmap.SelectedHitObjects.AddRange(objects);
+
+            EditorBeatmap.EndChange();
+        }
+
+        private void updateClipboardActionAvailability()
+        {
+            CanCut.Value = CanCopy.Value = EditorBeatmap.SelectedHitObjects.Any();
+            CanPaste.Value = !string.IsNullOrEmpty(clipboard.Value);
         }
 
         private string formatSelectionAsString()

osu.Game/Screens/Edit/Editor.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using JetBrains.Annotations;
 using osu.Framework;
@@ -24,7 +23,6 @@ using osu.Game.Graphics;
 using osu.Game.Graphics.Cursor;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Input.Bindings;
-using osu.Game.IO.Serialization;
 using osu.Game.Online.API;
 using osu.Game.Overlays;
 using osu.Game.Rulesets.Edit;
@@ -105,6 +103,9 @@ namespace osu.Game.Screens.Edit
         [Resolved]
         private MusicController music { get; set; }
 
+        [Cached]
+        public readonly EditorClipboard Clipboard = new EditorClipboard();
+
         public Editor(EditorLoader loader = null)
         {
             this.loader = loader;
@@ -180,10 +181,6 @@ namespace osu.Game.Screens.Edit
             OsuMenuItem undoMenuItem;
             OsuMenuItem redoMenuItem;
 
-            EditorMenuItem cutMenuItem;
-            EditorMenuItem copyMenuItem;
-            EditorMenuItem pasteMenuItem;
-
             AddInternal(new OsuContextMenuContainer
             {
                 RelativeSizeAxes = Axes.Both,
@@ -299,19 +296,15 @@ namespace osu.Game.Screens.Edit
             changeHandler.CanUndo.BindValueChanged(v => undoMenuItem.Action.Disabled = !v.NewValue, true);
             changeHandler.CanRedo.BindValueChanged(v => redoMenuItem.Action.Disabled = !v.NewValue, true);
 
-            editorBeatmap.SelectedHitObjects.BindCollectionChanged((_, __) =>
-            {
-                bool hasObjects = editorBeatmap.SelectedHitObjects.Count > 0;
-
-                cutMenuItem.Action.Disabled = !hasObjects;
-                copyMenuItem.Action.Disabled = !hasObjects;
-            }, true);
-
-            clipboard.BindValueChanged(content => pasteMenuItem.Action.Disabled = string.IsNullOrEmpty(content.NewValue));
-
             menuBar.Mode.ValueChanged += onModeChanged;
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            setUpClipboardActionAvailability();
+        }
+
         /// <summary>
         /// If the beatmap's track has changed, this method must be called to keep the editor in a valid state.
         /// </summary>
@@ -324,7 +317,7 @@ namespace osu.Game.Screens.Edit
         public void RestoreState([NotNull] EditorState state) => Schedule(() =>
         {
             clock.Seek(state.Time);
-            clipboard.Value = state.ClipboardContent;
+            Clipboard.Content.Value = state.ClipboardContent;
         });
 
         protected void Save()
@@ -561,45 +554,37 @@ namespace osu.Game.Screens.Edit
             this.Exit();
         }
 
-        private readonly Bindable<string> clipboard = new Bindable<string>();
+        #region Clipboard support
 
-        protected void Cut()
+        private EditorMenuItem cutMenuItem;
+        private EditorMenuItem copyMenuItem;
+        private EditorMenuItem pasteMenuItem;
+
+        private readonly BindableWithCurrent<bool> canCut = new BindableWithCurrent<bool>();
+        private readonly BindableWithCurrent<bool> canCopy = new BindableWithCurrent<bool>();
+        private readonly BindableWithCurrent<bool> canPaste = new BindableWithCurrent<bool>();
+
+        private void setUpClipboardActionAvailability()
         {
-            Copy();
-            editorBeatmap.RemoveRange(editorBeatmap.SelectedHitObjects.ToArray());
+            canCut.Current.BindValueChanged(cut => cutMenuItem.Action.Disabled = !cut.NewValue, true);
+            canCopy.Current.BindValueChanged(copy => copyMenuItem.Action.Disabled = !copy.NewValue, true);
+            canPaste.Current.BindValueChanged(paste => pasteMenuItem.Action.Disabled = !paste.NewValue, true);
         }
 
-        protected void Copy()
+        private void rebindClipboardBindables()
         {
-            if (editorBeatmap.SelectedHitObjects.Count == 0)
-                return;
-
-            clipboard.Value = new ClipboardContent(editorBeatmap).Serialize();
+            canCut.Current = currentScreen.CanCut;
+            canCopy.Current = currentScreen.CanCopy;
+            canPaste.Current = currentScreen.CanPaste;
         }
 
-        protected void Paste()
-        {
-            if (string.IsNullOrEmpty(clipboard.Value))
-                return;
+        protected void Cut() => currentScreen?.Cut();
 
-            var objects = clipboard.Value.Deserialize<ClipboardContent>().HitObjects;
+        protected void Copy() => currentScreen?.Copy();
 
-            Debug.Assert(objects.Any());
+        protected void Paste() => currentScreen?.Paste();
 
-            double timeOffset = clock.CurrentTime - objects.Min(o => o.StartTime);
-
-            foreach (var h in objects)
-                h.StartTime += timeOffset;
-
-            editorBeatmap.BeginChange();
-
-            editorBeatmap.SelectedHitObjects.Clear();
-
-            editorBeatmap.AddRange(objects);
-            editorBeatmap.SelectedHitObjects.AddRange(objects);
-
-            editorBeatmap.EndChange();
-        }
+        #endregion
 
         protected void Undo() => changeHandler.RestoreState(-1);
 
@@ -677,6 +662,7 @@ namespace osu.Game.Screens.Edit
             finally
             {
                 updateSampleDisabledState();
+                rebindClipboardBindables();
             }
         }
 
@@ -737,7 +723,7 @@ namespace osu.Game.Screens.Edit
                 if (difficultyItems.Count > 0)
                     difficultyItems.Add(new EditorMenuItemSpacer());
 
-                foreach (var beatmap in rulesetBeatmaps.OrderBy(b => b.StarDifficulty))
+                foreach (var beatmap in rulesetBeatmaps.OrderBy(b => b.StarRating))
                     difficultyItems.Add(createDifficultyMenuItem(beatmap));
             }
 
@@ -757,7 +743,7 @@ namespace osu.Game.Screens.Edit
         protected void SwitchToDifficulty(BeatmapInfo nextBeatmap) => loader?.ScheduleDifficultySwitch(nextBeatmap, new EditorState
         {
             Time = clock.CurrentTimeAccurate,
-            ClipboardContent = editorBeatmap.BeatmapInfo.RulesetID == nextBeatmap.RulesetID ? clipboard.Value : string.Empty
+            ClipboardContent = editorBeatmap.BeatmapInfo.RulesetID == nextBeatmap.RulesetID ? Clipboard.Content.Value : string.Empty
         });
 
         private void cancelExit()

osu.Game/Screens/Edit/EditorClipboard.cs

@@ -0,0 +1,15 @@
+// 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;
+
+namespace osu.Game.Screens.Edit
+{
+    /// <summary>
+    /// Wraps the contents of the editor clipboard.
+    /// </summary>
+    public class EditorClipboard
+    {
+        public Bindable<string> Content { get; } = new Bindable<string>();
+    }
+}

osu.Game/Screens/Edit/EditorScreen.cs

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
@@ -49,5 +50,54 @@ namespace osu.Game.Screens.Edit
             this.ScaleTo(0.98f, 200, Easing.OutQuint)
                 .FadeOut(200, Easing.OutQuint);
         }
+
+        #region Clipboard operations
+
+        public BindableBool CanCut { get; } = new BindableBool();
+
+        /// <summary>
+        /// Performs a "cut to clipboard" operation appropriate for the given screen.
+        /// </summary>
+        protected virtual void PerformCut()
+        {
+        }
+
+        public void Cut()
+        {
+            if (CanCut.Value)
+                PerformCut();
+        }
+
+        public BindableBool CanCopy { get; } = new BindableBool();
+
+        /// <summary>
+        /// Performs a "copy to clipboard" operation appropriate for the given screen.
+        /// </summary>
+        protected virtual void PerformCopy()
+        {
+        }
+
+        public virtual void Copy()
+        {
+            if (CanCopy.Value)
+                PerformCopy();
+        }
+
+        public BindableBool CanPaste { get; } = new BindableBool();
+
+        /// <summary>
+        /// Performs a "paste from clipboard" operation appropriate for the given screen.
+        /// </summary>
+        protected virtual void PerformPaste()
+        {
+        }
+
+        public virtual void Paste()
+        {
+            if (CanPaste.Value)
+                PerformPaste();
+        }
+
+        #endregion
     }
 }

osu.Game/Screens/Edit/Setup/MetadataSection.cs

@@ -47,7 +47,7 @@ namespace osu.Game.Screens.Edit.Setup
                 Empty(),
 
                 creatorTextBox = createTextBox<LabelledTextBox>("Creator", metadata.Author.Username),
-                difficultyTextBox = createTextBox<LabelledTextBox>("Difficulty Name", Beatmap.BeatmapInfo.Version),
+                difficultyTextBox = createTextBox<LabelledTextBox>("Difficulty Name", Beatmap.BeatmapInfo.DifficultyName),
                 sourceTextBox = createTextBox<LabelledTextBox>("Source", metadata.Source),
                 tagsTextBox = createTextBox<LabelledTextBox>("Tags", metadata.Tags)
             };
@@ -111,7 +111,7 @@ namespace osu.Game.Screens.Edit.Setup
             Beatmap.Metadata.Title = RomanisedTitleTextBox.Current.Value;
 
             Beatmap.Metadata.AuthorString = creatorTextBox.Current.Value;
-            Beatmap.BeatmapInfo.Version = difficultyTextBox.Current.Value;
+            Beatmap.BeatmapInfo.DifficultyName = difficultyTextBox.Current.Value;
             Beatmap.Metadata.Source = sourceTextBox.Current.Value;
             Beatmap.Metadata.Tags = tagsTextBox.Current.Value;
         }

osu.Game/Screens/Menu/MainMenu.cs

@@ -1,6 +1,7 @@
 // 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 osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
@@ -214,10 +215,16 @@ namespace osu.Game.Screens.Menu
             }
             else if (!api.IsLoggedIn)
             {
-                logo.Action += displayLogin;
+                // copy out old action to avoid accidentally capturing logo.Action in closure, causing a self-reference loop.
+                var previousAction = logo.Action;
+
+                // we want to hook into logo.Action to display the login overlay, but also preserve the return value of the old action.
+                // therefore pass the old action to displayLogin, so that it can return that value.
+                // this ensures that the OsuLogo sample does not play when it is not desired.
+                logo.Action = () => displayLogin(previousAction);
             }
 
-            bool displayLogin()
+            bool displayLogin(Func<bool> originalAction)
             {
                 if (!loginDisplayed.Value)
                 {
@@ -225,7 +232,7 @@ namespace osu.Game.Screens.Menu
                     loginDisplayed.Value = true;
                 }
 
-                return true;
+                return originalAction.Invoke();
             }
         }
 

osu.Game/Screens/OnlinePlay/Multiplayer/Participants/TeamDisplay.cs

@@ -29,23 +29,29 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
         [Resolved]
         private OsuColour colours { get; set; }
 
+        private OsuClickableContainer clickableContent;
+
         public TeamDisplay(MultiplayerRoomUser user)
         {
             this.user = user;
 
             RelativeSizeAxes = Axes.Y;
-            Width = 15;
+
+            AutoSizeAxes = Axes.X;
 
             Margin = new MarginPadding { Horizontal = 3 };
-
-            Alpha = 0;
-            Scale = new Vector2(0, 1);
         }
 
         [BackgroundDependencyLoader]
         private void load(AudioManager audio)
         {
-            box = new Container
+            InternalChild = clickableContent = new OsuClickableContainer
+            {
+                Width = 15,
+                Alpha = 0,
+                Scale = new Vector2(0, 1),
+                RelativeSizeAxes = Axes.Y,
+                Child = box = new Container
                 {
                     RelativeSizeAxes = Axes.Both,
                     CornerRadius = 5,
@@ -60,21 +66,13 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
                         Anchor = Anchor.Centre,
                         Origin = Anchor.Centre,
                     }
+                }
             };
 
             if (Client.LocalUser?.Equals(user) == true)
             {
-                InternalChild = new OsuClickableContainer
-                {
-                    RelativeSizeAxes = Axes.Both,
-                    TooltipText = "Change team",
-                    Action = changeTeam,
-                    Child = box
-                };
-            }
-            else
-            {
-                InternalChild = box;
+                clickableContent.Action = changeTeam;
+                clickableContent.TooltipText = "Change team";
             }
 
             sampleTeamSwap = audio.Samples.Get(@"Multiplayer/team-swap");
@@ -88,7 +86,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
             });
         }
 
-        private int? displayedTeam;
+        public int? DisplayedTeam { get; private set; }
 
         protected override void OnRoomUpdated()
         {
@@ -102,28 +100,28 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
 
             int? newTeam = (userRoomState as TeamVersusUserState)?.TeamID;
 
-            if (newTeam == displayedTeam)
+            if (newTeam == DisplayedTeam)
                 return;
 
             // only play the sample if an already valid team changes to another valid team.
             // this avoids playing a sound for each user if the match type is changed to/from a team mode.
-            if (newTeam != null && displayedTeam != null)
+            if (newTeam != null && DisplayedTeam != null)
                 sampleTeamSwap?.Play();
 
-            displayedTeam = newTeam;
+            DisplayedTeam = newTeam;
 
-            if (displayedTeam != null)
+            if (DisplayedTeam != null)
             {
-                box.FadeColour(getColourForTeam(displayedTeam.Value), duration, Easing.OutQuint);
+                box.FadeColour(getColourForTeam(DisplayedTeam.Value), duration, Easing.OutQuint);
                 box.ScaleTo(new Vector2(box.Scale.X < 0 ? 1 : -1, 1), duration, Easing.OutQuint);
 
-                this.ScaleTo(Vector2.One, duration, Easing.OutQuint);
-                this.FadeIn(duration);
+                clickableContent.ScaleTo(Vector2.One, duration, Easing.OutQuint);
+                clickableContent.FadeIn(duration);
             }
             else
             {
-                this.ScaleTo(new Vector2(0, 1), duration, Easing.OutQuint);
-                this.FadeOut(duration);
+                clickableContent.ScaleTo(new Vector2(0, 1), duration, Easing.OutQuint);
+                clickableContent.FadeOut(duration);
             }
         }
 

osu.Game/Screens/Play/BeatmapMetadataDisplay.cs

@@ -126,7 +126,7 @@ namespace osu.Game.Screens.Play
                             {
                                 new OsuSpriteText
                                 {
-                                    Text = beatmap?.BeatmapInfo?.Version,
+                                    Text = beatmap?.BeatmapInfo?.DifficultyName,
                                     Font = OsuFont.GetFont(size: 26, italics: true),
                                     Anchor = Anchor.TopCentre,
                                     Origin = Anchor.TopCentre,

osu.Game/Screens/Ranking/Expanded/ExpandedPanelMiddleContent.cs

@@ -164,7 +164,7 @@ namespace osu.Game.Screens.Ranking.Expanded
                                     {
                                         Anchor = Anchor.TopCentre,
                                         Origin = Anchor.TopCentre,
-                                        Text = beatmap.Version,
+                                        Text = beatmap.DifficultyName,
                                         Font = OsuFont.Torus.With(size: 16, weight: FontWeight.SemiBold),
                                     },
                                     new OsuTextFlowContainer(s => s.Font = OsuFont.Torus.With(size: 12))

osu.Game/Screens/Select/BeatmapInfoWedge.cs

@@ -229,7 +229,7 @@ namespace osu.Game.Screens.Select
                         {
                             VersionLabel = new OsuSpriteText
                             {
-                                Text = beatmapInfo.Version,
+                                Text = beatmapInfo.DifficultyName,
                                 Font = OsuFont.GetFont(size: 24, italics: true),
                                 RelativeSizeAxes = Axes.X,
                                 Truncate = true,
@@ -324,7 +324,7 @@ namespace osu.Game.Screens.Select
                 });
 
                 // no difficulty means it can't have a status to show
-                if (beatmapInfo.Version == null)
+                if (beatmapInfo.DifficultyName == null)
                     StatusPill.Hide();
 
                 addInfoLabels();

osu.Game/Screens/Select/Carousel/CarouselBeatmap.cs

@@ -38,7 +38,7 @@ namespace osu.Game.Screens.Select.Carousel
                 return;
             }
 
-            match &= !criteria.StarDifficulty.HasFilter || criteria.StarDifficulty.IsInRange(BeatmapInfo.StarDifficulty);
+            match &= !criteria.StarDifficulty.HasFilter || criteria.StarDifficulty.IsInRange(BeatmapInfo.StarRating);
             match &= !criteria.ApproachRate.HasFilter || criteria.ApproachRate.IsInRange(BeatmapInfo.BaseDifficulty.ApproachRate);
             match &= !criteria.DrainRate.HasFilter || criteria.DrainRate.IsInRange(BeatmapInfo.BaseDifficulty.DrainRate);
             match &= !criteria.CircleSize.HasFilter || criteria.CircleSize.IsInRange(BeatmapInfo.BaseDifficulty.CircleSize);
@@ -53,7 +53,7 @@ namespace osu.Game.Screens.Select.Carousel
             match &= !criteria.Artist.HasFilter || criteria.Artist.Matches(BeatmapInfo.Metadata.Artist) ||
                      criteria.Artist.Matches(BeatmapInfo.Metadata.ArtistUnicode);
 
-            match &= !criteria.UserStarDifficulty.HasFilter || criteria.UserStarDifficulty.IsInRange(BeatmapInfo.StarDifficulty);
+            match &= !criteria.UserStarDifficulty.HasFilter || criteria.UserStarDifficulty.IsInRange(BeatmapInfo.StarRating);
 
             if (match)
             {
@@ -92,7 +92,7 @@ namespace osu.Game.Screens.Select.Carousel
                     int ruleset = BeatmapInfo.RulesetID.CompareTo(otherBeatmap.BeatmapInfo.RulesetID);
                     if (ruleset != 0) return ruleset;
 
-                    return BeatmapInfo.StarDifficulty.CompareTo(otherBeatmap.BeatmapInfo.StarDifficulty);
+                    return BeatmapInfo.StarRating.CompareTo(otherBeatmap.BeatmapInfo.StarRating);
             }
         }
 

osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs

@@ -84,7 +84,7 @@ namespace osu.Game.Screens.Select.Carousel
                     return compareUsingAggregateMax(otherSet, b => b.Length);
 
                 case SortMode.Difficulty:
-                    return compareUsingAggregateMax(otherSet, b => b.StarDifficulty);
+                    return compareUsingAggregateMax(otherSet, b => b.StarRating);
             }
         }
 

osu.Game/Screens/Select/Carousel/DrawableCarouselBeatmap.cs

@@ -129,7 +129,7 @@ namespace osu.Game.Screens.Select.Carousel
                                     {
                                         new OsuSpriteText
                                         {
-                                            Text = beatmapInfo.Version,
+                                            Text = beatmapInfo.DifficultyName,
                                             Font = OsuFont.GetFont(size: 20),
                                             Anchor = Anchor.BottomLeft,
                                             Origin = Anchor.BottomLeft

osu.Game/Stores/BeatmapImporter.cs

@@ -253,7 +253,7 @@ namespace osu.Game.Stores
                     var beatmap = new RealmBeatmap(ruleset, difficulty, metadata)
                     {
                         Hash = hash,
-                        DifficultyName = decodedInfo.Version,
+                        DifficultyName = decodedInfo.DifficultyName,
                         OnlineID = decodedInfo.OnlineBeatmapID ?? -1,
                         AudioLeadIn = decodedInfo.AudioLeadIn,
                         StackLeniency = decodedInfo.StackLeniency,

osu.Game/Stores/RealmRulesetStore.cs

@@ -147,19 +147,15 @@ namespace osu.Game.Stores
                     {
                         try
                         {
-                            var type = Type.GetType(r.InstantiationInfo);
+                            var resolvedType = Type.GetType(r.InstantiationInfo)
+                                               ?? throw new RulesetLoadException(@"Type could not be resolved");
 
-                            if (type == null)
-                                throw new InvalidOperationException(@"Type resolution failure.");
+                            var instanceInfo = (Activator.CreateInstance(resolvedType) as Ruleset)?.RulesetInfo
+                                               ?? throw new RulesetLoadException(@"Instantiation failure");
 
-                            var rInstance = (Activator.CreateInstance(type) as Ruleset)?.RulesetInfo;
-
-                            if (rInstance == null)
-                                throw new InvalidOperationException(@"Instantiation failure.");
-
-                            r.Name = rInstance.Name;
-                            r.ShortName = rInstance.ShortName;
-                            r.InstantiationInfo = rInstance.InstantiationInfo;
+                            r.Name = instanceInfo.Name;
+                            r.ShortName = instanceInfo.ShortName;
+                            r.InstantiationInfo = instanceInfo.InstantiationInfo;
                             r.Available = true;
 
                             detachedRulesets.Add(r.Clone());

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

@@ -72,6 +72,21 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
             // We want the user to be immediately available for testing, so force a scheduler update to run the update-bound continuation.
             Scheduler.Update();
+
+            switch (Room?.MatchState)
+            {
+                case TeamVersusRoomState teamVersus:
+                    Debug.Assert(Room != null);
+
+                    // simulate the server's automatic assignment of users to teams on join.
+                    // the "best" team is the one with the least users on it.
+                    int bestTeam = teamVersus.Teams
+                                             .Select(team => (teamID: team.ID, userCount: Room.Users.Count(u => (u.MatchState as TeamVersusUserState)?.TeamID == team.ID)))
+                                             .OrderBy(pair => pair.userCount)
+                                             .First().teamID;
+                    ((IMultiplayerClient)this).MatchUserStateChanged(user.UserID, new TeamVersusUserState { TeamID = bestTeam }).Wait();
+                    break;
+            }
         }
 
         public void RemoveUser(APIUser user)

osu.Game/Tests/Visual/OsuTestScene.cs

@@ -228,8 +228,8 @@ namespace osu.Game.Tests.Visual
                         Checksum = beatmap.MD5Hash,
                         AuthorID = beatmap.Metadata.Author.OnlineID,
                         RulesetID = beatmap.RulesetID,
-                        StarRating = beatmap.StarDifficulty,
-                        DifficultyName = beatmap.Version,
+                        StarRating = beatmap.StarRating,
+                        DifficultyName = beatmap.DifficultyName,
                     }
                 }
             };