Manually integrate r84167
	Editor: Track changes: Apply Undo's
	http://bugs.activestate.com/show_bug.cgi?id=102171
	r=marky
	sr=toddw
	rn=



git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14269 b87d16e7-d29f-4ee1-b5ec-817d645d335f