MouseArea: react to touch ungrab

If an event handler (such as DragHandler) takes the exclusive grab
of a touchpoint that MouseArea had already grabbed as a synth-mouse,
it should react in the same way as if its grab of the actual mouse was
stolen: release the pressed state, etc.

Fixes: QTBUG-77624
Change-Id: I51f4fb253f7d0377be421c23e617942507616e72
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/quick/items/qquickmousearea.cpp b/src/quick/items/qquickmousearea.cpp
index ddf34798d7..368379f5c4 100644
--- a/src/quick/items/qquickmousearea.cpp
+++ b/src/quick/items/qquickmousearea.cpp
@@ -942,6 +942,12 @@ void QQuickMouseArea::mouseUngrabEvent()
     ungrabMouse();
 }
 
+void QQuickMouseArea::touchUngrabEvent()
+{
+    // allow a Pointer Handler to steal the grab from MouseArea
+    ungrabMouse();
+}
+
 bool QQuickMouseArea::sendMouseEvent(QMouseEvent *event)
 {
     Q_D(QQuickMouseArea);