QQuickWidget: accept touchpoint even if it has a passive grab

In the test case from QTBUG-113558, a QQuickWidget's only event-handling
object is a TapHandler with its default gesturePolicy, so that on touch
press, it gets pressed; but it was missing the touch release and getting
stuck in pressed state.

As explained in dc8f44b14501ecd4acc196f5138aeff3f7502d0a, widgets don't
care about (exclusive or passive) grabbers, and rely on points being
accepted to make the widget that received the TouchBegin an implicit
grabber. If the only thing that happened in the Qt Quick scene in the
QQuickWidget is that the touchpoint got a passive grab, it's still a
kind of interaction, and we want to ensure that the TapHandler will see
the release too, to avoid getting stuck. (This means that passive grabs
are not passive from the perspective of widget event delivery: the
TapHandler ends up excluding delivery of the touchpoint to other
widgets, even though it didn't mean to. But hopefully nobody expects
cooperation with touch-handling widgets underneath the Quick scene.)

Fixes: QTBUG-113558
Pick-to: 6.5 6.6 6.7
Change-Id: Ided6247b43a2405dbfdf9d195bb45ceae4cf58fd
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/quickwidgets/qquickwidget.cpp b/src/quickwidgets/qquickwidget.cpp
index 5b3e4394ce..c2c0f6f8d3 100644
--- a/src/quickwidgets/qquickwidget.cpp
+++ b/src/quickwidgets/qquickwidget.cpp
@@ -1665,7 +1665,7 @@ bool QQuickWidget::event(QEvent *e)
             QPointerEvent *pointerEvent = static_cast<QPointerEvent *>(e);
             auto deliveredPoints = pointerEvent->points();
             for (auto &point : deliveredPoints) {
-                if (pointerEvent->exclusiveGrabber(point))
+                if (pointerEvent->exclusiveGrabber(point) || !pointerEvent->passiveGrabbers(point).isEmpty())
                     point.setAccepted(true);
             }
         }