Menus become detached from Qt windows
To reproduce:
- Open some Qt program that has a menu.
- Click the menu to open it.
- Move the Qt window to a different position on screen.
- Click the menu again.
Result: the menu popup appears at the old window position.
Affects git revision 34457549
Does not affect the version of Xfwm in Ubuntu 20.04 (4.14.1 (revision 44809c49))