tmp: fix maximize to fullscreen then close on mac pr:3507 merged

native/Avalonia.Native/src/OSX/window.mm

@@ -805,6 +805,11 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
         [self removeTrackingArea:_area];
         _area = nullptr;
     }
+	
+    if (_parent == nullptr)
+    {
+        return;
+    }	
     
     NSRect rect = NSZeroRect;
     rect.size = newSize;