Turn on IDE0052

.globalconfig

@@ -37,7 +37,7 @@ dotnet_diagnostic.IDE0055.severity = warning
 dotnet_diagnostic.IDE0051.severity = silent
 
 # IDE0052: Private member is unused
-dotnet_diagnostic.IDE0052.severity = silent
+dotnet_diagnostic.IDE0052.severity = warning
 
 # IDE0073: File header
 dotnet_diagnostic.IDE0073.severity = warning

osu.Framework.Tests/Dependencies/CachedAttributeTest.cs

@@ -313,6 +313,8 @@ private class Provider4
 #pragma warning restore 169
         }
 
+#pragma warning disable IDE0052 // Unread private member
+
         private class Provider5
         {
             [Cached]

osu.Framework.Tests/Polygons/LineIntersections.cs

@@ -14,7 +14,7 @@ public class LineIntersections
         private static readonly Vector2 up_1 = new Vector2(0, 1);
         private static readonly Vector2 up_2 = new Vector2(0, 2);
         private static readonly Vector2 down_1 = new Vector2(0, -1);
-        private static readonly Vector2 down_2 = new Vector2(0, -2);
+        // private static readonly Vector2 down_2 = new Vector2(0, -2); // unused
         private static readonly Vector2 left_1 = new Vector2(-1, 0);
         private static readonly Vector2 left_2 = new Vector2(-2, 0);
         private static readonly Vector2 right_1 = new Vector2(1, 0);

osu.Framework.Tests/Visual/Bindables/TestSceneBindableAutoUnbinding.cs

@@ -106,7 +106,9 @@ public void TestBindableAutoUnbindingResolution()
         public class BindableExposingFillFlowContainer : FillFlowContainer
         {
             [Cached]
+#pragma warning disable IDE0052 // Unread private member
             private Bindable<int> bindable = new Bindable<int>();
+#pragma warning restore IDE0052 //
         }
 
         public class TestResolvedBindableDrawable : TestExposedBindableDrawable

osu.Framework/Platform/MacOS/Native/NSDictionary.cs

@@ -9,7 +9,9 @@ internal readonly struct NSDictionary
     {
         internal IntPtr Handle { get; }
 
+#pragma warning disable IDE0052 // Unread private member
         private static IntPtr classPointer = Class.Get("NSDictionary");
+#pragma warning restore IDE0052 //
 
         internal NSDictionary(IntPtr handle)
         {