Mac: Detect the d-pad and pause buttons on Steelseries MFi gamepads (bug #3124.)

src/video/uikit/SDL_uikitwindow.m

@@ -317,6 +317,10 @@ UIKit_DestroyWindow(_THIS, SDL_Window * window)
                 [view setSDLWindow:NULL];
             }
 
+            /* iOS may still hold a reference to the window after we release it.
+             * We want to make sure the SDL view controller isn't accessed in
+             * that case, because it would contain an invalid pointer to the old
+             * SDL window. */
             data.uiwindow.rootViewController = nil;
             data.uiwindow.hidden = YES;
         }