Calculation of GlobalPos

In wayland, if a window's coordinates are 100,100,100*100
At this point there is scaling, QT_SCALE_FACTOR = 2
In Qt we get the following coordinates
Widget: 0,0,100*100
Window: 0,0,100*100
QWaylandWIndow 0,0,200,200
these are no problem

Consider this time a mouse event pointer_motion arrives, pos = 20,20. This is based on the coordinates of the Surface.

Next in QWaylandInputDevice::Pointer::pointer_motion we convert it to global coordinates

QPointF global = window->window()->mapToGlobal(pos.toPoint());(https://github.com/qt/qtwayland/blob/dev/src/client/qwaylandinputdevice.cpp#L786)

The global coordinates we get are still 20,20

Since our window topleft = 0,0, we get the result without any problems.

However, there is a problem with the call here window->window()->mapToGlobal, if we set the coordinates of the window in the future, the coordinates obtained here will be 120,120 This is a wrong answer. The pos = 20,20 we received is the value after scaling. When calculating the global coordinates, we should also calculate the value based on scaling. The correct value should be 220,220.

So, even though it doesn't seem wrong now, there are some wayland extensions that specify the topleft of the window. This creates problems.

And, a zoomed coordinate + the topleft of an unzoomed window. It seems incomprehensible.