Mark stationary touch points as updated if pressure or velocity changes

This is to inform Qt Quick when a stationary touchpoint is delivered
that it is because of a changed property. Qt Quick still needs to avoid
delivering item-customized events (with only the touch points that occur
inside the item) that contain only stationary touch points without
changed properties. To be able to check this private flag,
QQuickPointerTouchEvent needs to be a friend.

Task-number: QTBUG-77142
Change-Id: I6ee0dffbbeca9e513c77227b757252e2eec6a4ef
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index a3ef3b2314..83ca337aaa 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -2843,10 +2843,12 @@ void QGuiApplicationPrivate::processTouchEvent(QWindowSystemInterfacePrivate::To
             if (touchPoint.state() == Qt::TouchPointStationary) {
                 if (touchInfo.touchPoint.velocity() != touchPoint.velocity()) {
                     touchInfo.touchPoint.setVelocity(touchPoint.velocity());
+                    touchPoint.d->stationaryWithModifiedProperty = true;
                     stationaryTouchPointChangedProperty = true;
                 }
                 if (!qFuzzyCompare(touchInfo.touchPoint.pressure(), touchPoint.pressure())) {
                     touchInfo.touchPoint.setPressure(touchPoint.pressure());
+                    touchPoint.d->stationaryWithModifiedProperty = true;
                     stationaryTouchPointChangedProperty = true;
                 }
             } else {