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oliver authored
Reviewed by Adam. This fixes <rdar://problem/5060766> -- Frameset with an empty frame crashes due to null document. Debug builds hit the frame->document() assertion in EventHandler::prepareMouseEvent This null check seems necessary now, having run through all the logic on the path to this crash it appears that we can't avoid this null check. * page/EventHandler.cpp: (WebCore::EventHandler::updateDragAndDrop): git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20868 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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