bug#23179: 25.0.92; Restore `M-,' to continue etags search

[Juri Linkov]

>> 6. M-x project-find-regexp RET -- RET
>>
>>     finds nothing whereas I can see there are many places with
>>     such string “--” in project files.
>
> Thank you for the report, should be fixed in f0e026a849.

Thanks, I verified this is fixed.

> Please file new bug reports for unrelated problems, though. Even if you
> don't like interacting with Debbugs too much (I don't), it's better to have
> proper structured discussions (and meaningful bug references in commit
> messages).

Actually I don't dislike Debbugs, I just hesitated to create a new report
for such a small problem.  Even if we used another bug tracker like GitLab,
I would try to add this as a comment to an existing issue instead of
creating a separate one.  So the problem is not in Debbugs, and GitLab
is not a panacea.  Moreover, when working on a project in GitLab, I strive
to do as much work as possible in Emacs, e.g. read MR diffs using vc-git,
but still miss an ability to follow GitLab discussions in Emacs.
Until someone writes Emacs frontend to GitLab discussion lists,
I prefer the current Gnus frontend to Debbugs discussion threads.