When the Wacom tablet pen hovers over tablet, this should probably always result in mouse move events for widgets with mouse tracking enabled.
Behaviour depends on whether the pen hovers over the tablet while the Qt based application is started.
Case A) Pen hovers over tablet when application is started:
Moving the pen results in mouseMoveEvents. Pen can be used just like a mouse. No QEvent::TabletMove events are triggered.
Case B) Pen does not hover over tablet when application is started:
No mouseMoveEvents are triggered when subsequently hovering with the pen over the tablet. However, now QEvent::TabletMove events are triggered instead.