Fix inspections.

osu.Framework/Graphics/BlendingParameters.cs

···
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
+using System.Diagnostics.CodeAnalysis;
 using osuTK.Graphics.ES30;
 
 namespace osu.Framework.Graphics
···
 
         public override readonly bool Equals(object obj) => obj is BlendingParameters other && this == other;
 
+        [SuppressMessage("ReSharper", "NonReadonlyMemberInGetHashCode")]
         public override readonly int GetHashCode() => HashCode.Combine(Source, Destination, SourceAlpha, DestinationAlpha, RGBEquation, AlphaEquation);
 
         public readonly bool IsDisabled =>

osu.Framework/Graphics/Colour/SRGBColour.cs

···
         /// <param name="second">Second factor.</param>
         /// <returns>Product of first and second.</returns>
         public static SRGBColour operator *(SRGBColour first, SRGBColour second) => new Color4(
-                first.Linear.R * second.Linear.R,
-                first.Linear.G * second.Linear.G,
-                first.Linear.B * second.Linear.B,
-                first.Linear.A * second.Linear.A);
+            first.Linear.R * second.Linear.R,
+            first.Linear.G * second.Linear.G,
+            first.Linear.B * second.Linear.B,
+            first.Linear.A * second.Linear.A);
 
         public static SRGBColour operator *(SRGBColour first, float second) => new Color4(
-                first.Linear.R * second,
-                first.Linear.G * second,
-                first.Linear.B * second,
-                first.Linear.A * second);
+            first.Linear.R * second,
+            first.Linear.G * second,
+            first.Linear.B * second,
+            first.Linear.A * second);
 
         public static SRGBColour operator /(SRGBColour first, float second) => first * (1 / second);
 
         public static SRGBColour operator +(SRGBColour first, SRGBColour second) => new Color4(
-                first.Linear.R + second.Linear.R,
-                first.Linear.G + second.Linear.G,
-                first.Linear.B + second.Linear.B,
-                first.Linear.A + second.Linear.A);
+            first.Linear.R + second.Linear.R,
+            first.Linear.G + second.Linear.G,
+            first.Linear.B + second.Linear.B,
+            first.Linear.A + second.Linear.A);
 
         public Vector4 ToVector() => new Vector4(Linear.R, Linear.G, Linear.B, Linear.A);
         public static SRGBColour FromVector(Vector4 v) => new Color4(v.X, v.Y, v.Z, v.W);

osu.Framework/Graphics/DrawInfo.cs

···
 
         public readonly bool Equals(DrawInfo other) => Matrix.Equals(other.Matrix);
 
-        public override readonly string ToString() => $@"{GetType().ReadableName().Replace(@"DrawInfo", string.Empty)} DrawInfo";
+        public override string ToString() => $@"{GetType().ReadableName().Replace(@"DrawInfo", string.Empty)} DrawInfo";
     }
 }

osu.Framework/Graphics/Primitives/Quad.cs

···
 
         public ReadOnlySpan<Vector2> GetAxisVertices() => GetVertices();
 
-        public readonly unsafe ReadOnlySpan<Vector2> GetVertices() => MemoryMarshal.CreateReadOnlySpan(ref Unsafe.AsRef(in TopLeft), 4);
+        public ReadOnlySpan<Vector2> GetVertices() => MemoryMarshal.CreateReadOnlySpan(ref Unsafe.AsRef(in TopLeft), 4);
 
         public bool Contains(Vector2 pos) =>
             new Triangle(BottomRight, BottomLeft, TopRight).Contains(pos) ||

osu.Framework/Platform/MacOS/MacOSClipboard.cs

···
 {
     public class MacOSClipboard : Clipboard
     {
-        private NSPasteboard generalPasteboard = NSPasteboard.GeneralPasteboard();
+        private readonly NSPasteboard generalPasteboard = NSPasteboard.GeneralPasteboard();
 
         public override string GetText()
         {