At the moment the unlikely case of spinning the event loop from a
QQuickItem event handler for TouchBegin is not handled properly: It
will end up not delivering the subsequent TouchUpdate and TouchEnd
events to the item, leaving it in a state that should not normally
happen.

Change-Id: I668d065c9cf1a299bfd9268a9125d7a7e32f6786
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>