QQuickEventPoint::invalidate(): set m_pointId to zero

One reason is that if event->pointById(someKnownId) returns true,
a handler may assume that the point is still valid.  So either
pointById needs to check the valid flag, or we must reset the
pointId so that it won't be found.

Change-Id: I20e93f058737a77ed801f0148ab7525ab880902d
Reviewed-by: Jan Arve Sæther <jan-arve.saether@theqtcompany.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/quick/items/qquickevents.cpp b/src/quick/items/qquickevents.cpp
index f4b203ac53..4bb591fae3 100644
--- a/src/quick/items/qquickevents.cpp
+++ b/src/quick/items/qquickevents.cpp
@@ -537,6 +537,12 @@ void QQuickEventPoint::localize(QQuickItem *target)
         m_pos = QPointF();
 }
 
+void QQuickEventPoint::invalidate()
+{
+    m_valid = false;
+    m_pointId = 0;
+}
+
 QObject *QQuickEventPoint::grabber() const
 {
     return m_grabber.data();