When QWidgetWindow handles a QTouchEvent, it will call
updateTouchPointsForWidget() for each widget it tries
to deliver the touch event to. This will make sure that
the point's position() is updated to be local to the
widget being processed.
The problem is that we never reset this overwriting of
local positions in the event after we're done. So if we
later try to synthesize a mouse event from it, the local
position in the fake mouse event will be based on the local
position inside a random widget, and not the original local
position sent from QPA.
Rather than trying to store all the original local
positions inside the event before going through this delivery
logic, and reset it afterwards, we base the local position of
the synthesized mouse event on the (unmodified) global
position instead.
Fixes: QTBUG-90033
Change-Id: I1588351482de7cce9c06d102db3686ea8dd0c118
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
eadbf2dd0b