Re: undo gone in dired buffers

[Francesco Potorti`]

>    In my local Emacs hacks, I've fixed the inconsistency the other
>    way: revert doesn't throw away undo info any more.
>
>That seems bizarre, but I guess we should consider it.

However, Emacs 22.0.990 still throws away undo when reverting dired
buffers :-(

This is a change with respect to Emacs 21, and I don't think anyone
feels that it is necessary in practice, while some are against it.  I
think it should be reverted.