Generally, this might avoid unnecessary work in a quite common case.
But if high dpi scaling is set, the dpi (in logical pixels) does
not change. However this event is sent before
QGuiApplicationPrivate::processWindowScreenChangedEvent has had
time to change the geometry, and might cause a problem in QMenu
Amends f3a4b4258f.
Task-number: QTBUG-59484
Change-Id: Ie4ceedcb0754613cf239ae86b225c4139b70d0cc
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>