ASSERT: "self.window" in file qiosviewcontroller.mm, line 110

When closing an application from the ios file browser when a native window is shown we hit the assert in qiosviewcontroller.mm, line 110

To reproduce run the attached example, press the click me button, double click on the home button on the ipad and swipe the application up to close it.

If you are running in debug mode with a debugger attached you will see the assert.

You can confirm the assert doesn't happen if the user is not in the "file manager", either before pressing the button or after having closed the file manager (you can do that by selecting a .txt file in the browser)