Dangerous design in QWindowsWindow::~QWindowsWindow

In QWindowsWindow::~QWindowsWindow()
There is a call to:
QWindowSystemInterface::flushWindowSystemEvents();

Is that really necessary and good?
Here follows a crash scenario that took me time to find:

I have some "mouse move" code that cause the deletion of a popup widget. This causes ~QWindowsWindow() to be called, hence flushWindowSystemEvents() is also called. In turn, this causes a "button up event" to be called, because there was such a pending event.
This causes, in my code, the deletion of the same popup widget. My "mouse move" and "button up" codes are not meant to be called in the same time. But flushWindowSystemEvents causes this
Of course, I can fix this on my side. But this flushWindowSystemEvents in ~QWindowsWindow() is a potential trap for all sort of dirty problems.
IMHO, this is not good design.