bug#7567: Please add a history variable to read-regexp

[Stefan Monnier]

> I agree with that.  But I also think that it might be good to use
> `completing-read', to allow (lax) completion against the history.
> IOW, use the history for both completion and the usual history access.

I think this is a bad idea: completing-read is for completion against
"possible answers" which should be kept separate from
history-completion.  We could/should let TAB perform history completion
for non-completing-reads, but if we do that, it should be under the
control of the user.

Personally, I think that M-p should perform history completion, and
that's what my .emacs does.


        Stefan