[Zope] Undo System

I have a file A and a file B in Zope. I do the following, in order: 1. Edit A 2. Edit B 3. Edit A again. Now I can no longer Undo transaction #1, at least not until I undo #3. Presumably Zope knows this, otherwise it couldn't tell me as much when I try it. So my question is this: Is it feasible to reflect (in the undo list) which transactions do and don't depend on others? Basically, I am thinking that Transaction #1 might be colored red because it requires another undo first. - Gregor vorlon#iglou.com http://anime.at/gregordyne http://www.skysys.org/~gregor Anime, Amber, 3d, Mage, Eidolon, Miscellany