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

[Eli Zaretskii]

> Cc: 23179@debbugs.gnu.org, andlind@gmail.com
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sun, 3 Apr 2016 02:39:47 +0300
> 
> On 04/02/2016 09:58 AM, Eli Zaretskii wrote:
> 
> > But we could have a tags-only command that presented an xref UI, I
> > think.  (Its name could be "tags-search" ;-)
> 
> Probably not tags-search; we're only deprecating some etags commands, 
> but not removing them (yet?).

Fine with me.

> And why is etags so special that it needs its own find-regexp
> command, but other backends don't?

Etags isn't special, I just remembered that you said at some point you
couldn't see how other back-ends will be able to implement a similar
functionality.  But if I misremembered, or if you now see a way to do
this with other back-ends, by all means let's do that.

> Anyway, this should get you going:

Thanks, this looks good to me.

Anders, can you see if this provides a solution to your problem?