When a native window that is using QMacNativeWidget is closed then focus could end up not correctly returning to the Qt based window

When a native window that is using QMacNativeWidget is closed then focus could end up not correctly returning to the Qt based window. In the example, if the Qt based window is not active and then the native window using QMacNativeWidget is shown and then closed, it is not possible to put focus on the original Qt based window unless the application activation is changed to another application and then back again. To reproduce with the example do:

• Start the example
• Focus another application
• Click on the tray icon which will open the new window
• Click on the button in the new window
• Try to put focus in the TextField in the original window