Notification when an action is to be dropped#4

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pcuenca wants to merge 2 commits intoseanm:masterfrom

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Commits on Jun 3, 2012

* Do not import Cocoa.h so the code compiles on iPhone.
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* Post a notification when an action is about to be dropped because the 'levelsOfUndo' limit was reached. The userInfo dictionary associated to the notification contains the to-be-dropped action fo…
pcuenca
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