xcb: Delete touch points without target windows

When XCB_INPUT_TOUCH_BEGIN closes a popup, we then receive
XCB_INPUT_TOUCH_END, and cannot find a target window (because it's
destroyed). If we don't deliver it, we need to at least clear the
stored point from QPointingDevicePrivate::activePoints. Then when
we deliver the next touch press, m_fakeMouseSourcePointId also
needs to be reset.

It's now even more paramount that autotests (and real-world
touchscreens) must never omit any active touchpoint from a touch event.
If a point doesn't move, it must be included in the QTouchEvent, with
Stationary state. If not, QGuiApp::processTouchEvent() could generate
multiple TouchBegin events in a row, which gets other bits of logic
confused, here and there.

Fixes: QTBUG-94557
Fixes: QTBUG-98519
Fixes: QTBUG-102751
Fixes: QTBUG-103706
Pick-to: 6.2 6.3 5.15
Change-Id: Ia95e410a2bb8bc7784aa5d296fac2b89e53a9f55
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/auto/widgets/kernel/qgesturerecognizer/tst_qgesturerecognizer.cpp b/tests/auto/widgets/kernel/qgesturerecognizer/tst_qgesturerecognizer.cpp
index 6d5282732a..87e0290473 100644
--- a/tests/auto/widgets/kernel/qgesturerecognizer/tst_qgesturerecognizer.cpp
+++ b/tests/auto/widgets/kernel/qgesturerecognizer/tst_qgesturerecognizer.cpp
@@ -269,7 +269,7 @@ void tst_QGestureRecognizer::swipeGesture()
 
     // Press point #3
     points.append(points.last() + fingerDistance);
-    swipeSequence.press(points.size() - 1, points.last(), &widget);
+    swipeSequence.stationary(0).stationary(1).press(points.size() - 1, points.last(), &widget);
     swipeSequence.commit();
     Q_ASSERT(points.size() == swipePoints);