Merge branch 'master' into patch-1

CodeAnalysis/BannedSymbols.txt

@@ -0,0 +1,4 @@
+M:System.Object.Equals(System.Object,System.Object)~System.Boolean;Don't use object.Equals. Use IEquatable<T> or EqualityComparer<T>.Default instead.
+M:System.Object.Equals(System.Object)~System.Boolean;Don't use object.Equals. Use IEquatable<T> or EqualityComparer<T>.Default instead.
+M:System.ValueType.Equals(System.Object)~System.Boolean;Don't use object.Equals(Fallbacks to ValueType). Use IEquatable<T> or EqualityComparer<T>.Default instead.
+T:System.IComparable;Don't use non-generic IComparable. Use generic version instead.

Directory.Build.props

@@ -14,6 +14,10 @@
   <ItemGroup Label="Resources">
     <EmbeddedResource Include="Resources\**\*.*" />
   </ItemGroup>
+  <ItemGroup Label="Code Analysis">
+    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="2.9.7" PrivateAssets="All" />
+    <AdditionalFiles Include="$(MSBuildThisFileDirectory)CodeAnalysis\BannedSymbols.txt" />
+  </ItemGroup>
   <PropertyGroup Label="Project">
     <!-- DeepEqual is not netstandard-compatible. This is fine since we run tests with .NET Framework anyway.
     This is required due to https://github.com/NuGet/Home/issues/5740 -->

osu.Game/Online/Leaderboards/Leaderboard.cs

@@ -101,7 +101,7 @@ namespace osu.Game.Online.Leaderboards
             get => scope;
             set
             {
-                if (value.Equals(scope))
+                if (EqualityComparer<TScope>.Default.Equals(value, scope))
                     return;
 
                 scope = value;

osu.Game/Overlays/DirectOverlay.cs

@@ -47,7 +47,7 @@ namespace osu.Game.Overlays
             get => beatmapSets;
             set
             {
-                if (beatmapSets?.Equals(value) ?? false) return;
+                if (ReferenceEquals(beatmapSets, value)) return;
 
                 beatmapSets = value?.ToList();
 

osu.Game/Overlays/SocialOverlay.cs

@@ -38,7 +38,7 @@ namespace osu.Game.Overlays
             get => users;
             set
             {
-                if (users?.Equals(value) ?? false)
+                if (ReferenceEquals(users, value))
                     return;
 
                 users = value?.ToList();

osu.Game/Screens/Menu/MenuSideFlashes.cs

@@ -102,7 +102,7 @@ namespace osu.Game.Screens.Menu
 
         private void flash(Drawable d, double beatLength, bool kiai, TrackAmplitudes amplitudes)
         {
-            d.FadeTo(Math.Max(0, ((d.Equals(leftBox) ? amplitudes.LeftChannel : amplitudes.RightChannel) - amplitude_dead_zone) / (kiai ? kiai_multiplier : alpha_multiplier)), box_fade_in_time)
+            d.FadeTo(Math.Max(0, ((ReferenceEquals(d, leftBox) ? amplitudes.LeftChannel : amplitudes.RightChannel) - amplitude_dead_zone) / (kiai ? kiai_multiplier : alpha_multiplier)), box_fade_in_time)
              .Then()
              .FadeOut(beatLength, Easing.In);
         }

osu.Game/Screens/Play/KeyCounterAction.cs

@@ -1,6 +1,8 @@
 // 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;
+
 namespace osu.Game.Screens.Play
 {
     public class KeyCounterAction<T> : KeyCounter
@@ -16,7 +18,7 @@ namespace osu.Game.Screens.Play
 
         public bool OnPressed(T action, bool forwards)
         {
-            if (!action.Equals(Action))
+            if (!EqualityComparer<T>.Default.Equals(action, Action))
                 return false;
 
             IsLit = true;
@@ -27,7 +29,7 @@ namespace osu.Game.Screens.Play
 
         public bool OnReleased(T action, bool forwards)
         {
-            if (!action.Equals(Action))
+            if (!EqualityComparer<T>.Default.Equals(action, Action))
                 return false;
 
             IsLit = false;

osu.Game/Screens/Select/SongSelect.cs

@@ -405,7 +405,7 @@ namespace osu.Game.Screens.Select
 
                 // We may be arriving here due to another component changing the bindable Beatmap.
                 // In these cases, the other component has already loaded the beatmap, so we don't need to do so again.
-                if (!Equals(beatmap, Beatmap.Value.BeatmapInfo))
+                if (!EqualityComparer<BeatmapInfo>.Default.Equals(beatmap, Beatmap.Value.BeatmapInfo))
                 {
                     Logger.Log($"beatmap changed from \"{Beatmap.Value.BeatmapInfo}\" to \"{beatmap}\"");