Fix memory leak from Player's InputManager.

osu.Game/Screens/Play/Player.cs

@@ -222,6 +222,12 @@ namespace osu.Game.Screens.Play
             if (IsPaused) Pause(); else Resume();
         }
 
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+            playerInputManager?.Dispose();
+        }
+
         public void Restart()
         {
             sourceClock.Stop(); // If the clock is running and Restart is called the game will lag until relaunch
@@ -312,6 +318,9 @@ namespace osu.Game.Screens.Play
             }
             else
             {
+                FadeOut(250);
+                Content.ScaleTo(0.7f, 750, EasingTypes.InQuint);
+
                 dimLevel.ValueChanged -= dimChanged;
                 Background?.FadeTo(1f, 200);
                 return base.OnExiting(next);

osu.Game/Screens/Play/PlayerLoader.cs

@@ -89,6 +89,12 @@ namespace osu.Game.Screens.Play
         {
             Content.ScaleTo(0.7f, 150, EasingTypes.InQuint);
             FadeOut(150);
+
+            //this is required to clean up the InputManager in Player.
+            //can be removed once we solve that one.
+            if (player != null && player.LoadState != LoadState.Alive)
+                player.Dispose();
+
             return base.OnExiting(next);
         }