PointerHandlers: fix some grab notification and signal order problems

The singlePointHandlerProperties manual test showed how this was broken
in a couple of ways after 8c659c6c723e4f5f97f46a4555a4765e85c26f1d :
- When QQuickPointerTouchEvent::reset() is swapping one point instance
for another, and consequently transferring the grabbers from one to
another, it should not cause onGrabChanged to occur.  Every point
update was triggering DragHandler.onGrabChanged.
- The order of signal emission is important so that sceneGrabPos
will be correct in onGrabChanged.

Change-Id: I62a302d6e54126ae10834b6d622e82aa0e434bab
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/quick/items/qquickevents_p_p.h b/src/quick/items/qquickevents_p_p.h
index c4200ac550..2eebf131bc 100644
--- a/src/quick/items/qquickevents_p_p.h
+++ b/src/quick/items/qquickevents_p_p.h
@@ -370,6 +370,8 @@ private:
     QSizeF m_ellipseDiameters;
     QPointingDeviceUniqueId m_uniqueId;
 
+    friend class QQuickPointerTouchEvent;
+
     Q_DISABLE_COPY(QQuickEventTouchPoint)
 };