Triggering a popup window causes the background color of the window not to be updated

As stated in the title, triggering the popup window causes the background color of my main window to not update, and judging from qwindowsysteminterface.cpp in qtbase, it triggers the leavenEvent event one less time compared to x11.

I would like to ask if this is the wayland qt design or a bug? Thanks a lot for the answer!

 

I tried to add a judgment to void QApplicationPrivate::openPopup(QWidget *popup) in the qt-qapplication.cpp function to manually trigger the leaveEvent event can be a wayland solution to this problem: when detecting the

    if (popup->parentWidget())

{     QEvent leaveEvent(QEvent::Leave);     QApplication::sendEvent(popup->parentWidget(), &leaveEvent);     }

But this solution I think is not good, because there are differences between x11 and wayland, if you exclude kwin, the problem should be in qwayland, I was going to send a leaveEvent to Qt in qtwayland, but I can't seem to find a suitable place for it!