[ChangeLog][QQuickItem] Previously, containmentMask's position was
ignored. If containmentMask parent inherit from QQuickItem, then
position will take into account. In some cases, this is useful, for
example, to make click on button larger than the size of the button
itself, in all directions, not just to the right and bottom.
Fixes: QTBUG-82678
Pick-to: 6.2
Change-Id: Iec70352db2d866198713a72d4d589a06105f30bc
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
c7297de660