sproutcore/sproutcore — pull request #1226 by fairbanksg (2014-05-02 15:28:29+00:00)
Title: Fixes crash when mouse exits destroyed view

When the root responder would call mouseExisted on views that the mouse was exiting, it would not check if the view had been destroyed. Since the root responder keeps a private list of views that the mouse is over, this check is necessary to ensure the view is still valid.