Add contains override to allow correct rendering by CursorContainer on window bounds.

osu.Game/Graphics/Processing/RatioAdjust.cs

@@ -1,7 +1,6 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using OpenTK;
 
@@ -9,6 +8,8 @@ namespace osu.Game.Graphics.Processing
 {
     class RatioAdjust : LargeContainer
     {
+        public override bool Contains(Vector2 screenSpacePos) => true;
+
         protected override void Update()
         {
             base.Update();