Merge pull request #8409 from peppy/fix-song-select-play-crash

Fix crash when holding a key down while entering player

osu.Game/Screens/Select/FilterControl.cs

@@ -136,6 +136,8 @@ namespace osu.Game.Screens.Select
 
         public void Deactivate()
         {
+            searchTextBox.ReadOnly = true;
+
             searchTextBox.HoldFocus = false;
             if (searchTextBox.HasFocus)
                 GetContainingInputManager().ChangeFocus(searchTextBox);
@@ -143,6 +145,7 @@ namespace osu.Game.Screens.Select
 
         public void Activate()
         {
+            searchTextBox.ReadOnly = false;
             searchTextBox.HoldFocus = true;
         }