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I20060131-1200 Bug 126154 indicates that fatal exceptions can occur during change execution, against which we cannot do anything (e.g. an application like MS Word locked a file the user wanted to rename), and which we cannot detect upfront (because java.io.File does not reveal them). In such situations we currently show a scary dialog ('scary' is fine;-) with options Undo and Abort, Abort being the default. I think we should make Undo the default here, since that's what's approriate to try in most cases. Alternatively or additionally, we should put a (partial) undo on the undo stack if the user choses Abort, such that the undo possibility is not lost.
I'll try to get this in for 3.2.