Unlisten before calling listener and bind to target by default #4921
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The problem reported in #4919 is a regression caused by the
goog.events.*removal. Listeners were always called synchronously, but the difference with the new implementation is that aoncelistener is unregistered after calling the listener, whereas it was unregistered before previously. The second problem is that whenopt_thisis not provided, we no longer bind to the event target by default.Fixes #4919.