@SGaist,
Qt 6.3.2, Windows 10.

I found that winapi coordinates I got eventually turned out to be different from QCursor::pos() when talking about switching between different scales. So I decided to use QCursor::pos() instead, and it helped:

QPoint globalCursorPos = QCursor::pos(); auto menuGeom = ui.qMenuBarMain->geometry().translated(ui.qMenuBarMain->mapToGlobal(QPoint(0, 0))); if (menuGeom.contains(globalCursorPos)) //some work

Hi I dont know about mouse coors
but Just wanted to make sure you saw
Diagram Scene Example
in case you could borrow stuff from that.