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Changes between Version 2 and Version 3 of UndoManager

-              v2
+              v3
 ) Is out of order undo allowed?  Can you change molecule color, then change display style, then undo just the color change?
+= Cases where Undo is Frequently Desired =
+) Selections. The most common situation I (Tom G) encounter is that I clear a selection and I want it back and it was perhaps multiple atoms clicked by hand.  Many times I used different selections, and am too lazy to name them, then later want to use them again.  It would be nice if all my recent selections were remembered automatically with some description for each such as "5 atoms in model #1".  That is not really undo, but I think would be more useful than undo for selections.
+) Model motions.  Sometimes I accidentally move one model relative to another and it is a small disaster if I cannot restore the old position.  Rarely do I care about a change in camera view, only the motions of one model relative to another are relevant.
+Selection and movement are the two cases where Chimera 1 has some undo capability and in my experience these are the most useful.  But the useful cases no doubt depend on what you use Chimera for.