Re: Concern about new binding.

[Gregory Heytings]

> > You can easily undo it, however, with a quick C-/.
>
> I think that is limited to files under a certain size.

Yes, that limit is 'undo-outer-limit', set to 22 MB by default.

Unfortunately, when you execute 'revert-buffer' on such a large buffer, 
you get a warning _after_ the reversion has happened that you cannot undo 
it anymore: "Warning (undo): Buffer '...' undo info was ... bytes long. 
The undo info was discarded because it exceeded `undo-outer-limit'."

It would perhaps make sense to ask for confirmation _before_ executing the 
command ("The command '...' will discard undo info, really do it? (yes or 
no)").