again, this may be another CodeMirror issue, but I'm not seeing it in CM demos.
Ctrl-Z works fine to undo changes made in a cell, unless you press it one too many times, which currently ends you up with a completely empty cell. I don't think this is a feature, I think it only makes sense to undo until the last save point.
I'm seeing it act the same in Chrome and Firefox under Ubuntu 10.04
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