In response to touch cancel, don't just ungrab, send an ungrab event

QQuickWindowPrivate::sendUngrabEvent() sends an UngrabMouse event, and
that can be filtered by parent filters.  If a touch cancel happens to a
MouseArea in a ListView delegate, we need the ListView to filter the
UngrabMouse event so that QQuickFlickable::childMouseEventFilter() will
call QQuickFlickable::mouseUngrabEvent() and
QQuickFlickablePrivate::cancelInteraction() will set pressed to false.
The pressed state became true because Flickable filtered the press
event; so for symmetry, it also needs to filter the touch cancel (in the
form of a mouse ungrab), to avoid being stuck in a state where it can't
move programmatically.

Fixes: QTBUG-74679
Change-Id: I6c0ed364d2bc1f45c7e7b17846a09f6b53f91d0a
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

0 files changed, 0 insertions, 0 deletions