Vim persistent undo

Hi,

I just enabled persistent undo in vim, but realized that before turning on
persistent undo, it was occasionally useful debugging for me to undo my
changes until when I first opened the file, then play them back to see if I
had made any unintended changes. With persistent undo, however, I'm not sure
how to know when I get back to the state in which I first opened the file.
Does anyone have any ideas on how to find this out with persistent undo
enabled?

Thanks in advance!



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