Problem with interaction of auto-revert and auto-save-visited-file-name

[Reuben Thomas]

I just set auto-save-visited-file-name, and I notice that it seems to cause 
problems with auto-revert-mode. The problem is that first, that 
auto-revert-mode notices that the file has been saved and reverts it, or 
puts up a prompt because I try to edit the file some more and it wants to 
know if I want to edit the reverted or non-reverted version and secondly, 
by reverting I lose my undo history.

Is there some way that autorevert can be made to differentiate between files 
autosaved by Emacs and files updated externally?

I'm using the 22.1 release.

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