With some further digging, the call boils down to
px_ChangeHistory::isDirty(). Basically, we say that the doc is dirty if the
undo position at last save != the current undo position.
To see what I mean, type "foo", then save. then type some more and hit undo.
Everything gets removed.
This might be the correct way to do Undo, but it's screwing up marking stuff
as dirty. I think that I can nail this bug. More to follow.
Dom
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