In QWidget-world it's normal for input events to have the accepted
flag false by default, so that it's obvious after visiting a widget
subclass that does not override a particular handler function that it
did not handle that event type at all. For tablet events in
particular, the contract (to which we've been paying more attention to
ensure that QTBUG-47007 remains properly fixed) is that if a
QTabletEvent is not accepted, a mouse event will follow.
Tablet-unaware applications need to get the same mouse events from a
Wacom stylus as they would receive from an actual mouse.
In this case the issue was missing hover events (mouse movements
in which no mouse button is pressed). Without those, the enterEvent
and exitEvent virtuals are also not invoked properly.
Task-number: QTBUG-47007
Task-number: QTBUG-65199
Change-Id: I957005aad9d2bf85a3a41bbdebe3e046e34dee4d
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
b4b706d454