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

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sat, 2 Apr 2016 21:46:48 +0200
> From: Anders Lindgren <andlind@gmail.com>
> Cc: 23179@debbugs.gnu.org
> 
> The "xref" package is a big step forward, since it supports multiple backends etc. Unfortunately, vital
> functionality is missing -- searching and query-replace in all included files. Personally, I use `tags-search' at
> least 20 times per day (often more), and `tags-query-replace' several times each week. I don't think that my
> use pattern is extreme by any means.

Did you try any of the alternatives suggested in this discussion?  If
none of them satisfies your needs, can you elaborate why?

> I think that we would be making a big mistake if we would release Emacs 25 with an "xref" without searching
> and query-replace, but with key bindings that, for most tags users, break existing use patterns.

We are still discussing this issue, don't we? ;-)  And Emacs 25.1
release is still a couple of months away, so we still have time.

> > But we could have a tags-only command that presented an xref UI, I think. (Its name could be "tags-search"
> ;-)
> 
> 
> It would have been neat... Unfortunately, the problem is not launching the command, but rather continue
> searching past the first match -- since a source buffer, and not the xref UI buffer, will be current.

The xref UI solve this problem, as was already mentioned in this
discussion.

> I have given this some thought -- if we decide to really do make a change, maybe we should try to make the
> xref search command more isearch-like, so that a user could be able to continue an xref search using `C-s'
> rather than `M-,'. Unfortunately, there is no natural key binding to continue a normal query replace, but we
> could create something like `xref-query-replace-from-here', to continue query-replacing from the point in the
> current buffer and then continue with the next file in the file list.

xref-query-replace-in-results already provides a way for continuing
the replacement, so I'm not sure what you are had in mind here.