The QHoverEvent ctor takes two points: scenePos and globalPos; the first
of those is passed to the QSinglePointEvent ctor as _both_ the local and
scene pos, which calls QMutableEventPoint::setScenePosition() on the
persistent QEventPoint instance, and then detaches before setting
ephemeral state.
Therefore, we must construct QHoverEvent with scene position, not local
position, so that the right value is persisted. To localize a
QHoverEvent during delivery, use QMutableEventPoint::setPosition().
This needs to be done repeatedly while visiting multiple widgets or
items; the detach() prevents it from being saved in the persistent
QEventPoint in QPointingDevicePrivate::EventPointMap.
Amends 0a64a044b6
Task-number: QTBUG-35409
Task-number: QTBUG-100324
Change-Id: Ic1084e1c3cd384683666ba52fe34f16b9d039877
Pick-to: 6.4
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
9d6c1f387a