closed #3871: event->stopPropagation can't work for EventListenerAllAtOnce.  And add relevant test case.
issue #3871: Removes unneeded empty lines.
Merge pull request #5257 from dumganhar/iss3871-stop-propagation-fix

closed #3871: event->stopPropagation can't work for EventListenerAllAtOnce.  And add relevant test case.