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

[Eli Zaretskii]

> Date: Fri, 1 Apr 2016 12:13:39 +0200
> From: Anders Lindgren <andlind@gmail.com>
> Cc: 23179@debbugs.gnu.org
> 
>  Please describe the use case where you needed to invoke
>  tags-loop-continue. I think we made an effort to eliminate these use
>  cases (by providing alternatives that are built on top of xref), but
>  maybe some slipped through the cracks.
> 
> The basic use case is `M-x tags-search RET whatever RET'.

I guess we need an xref-based alternative to that.

> Ok, I can see the merits of the command, but I don't think it should take up 
> a prominent key binding like `M-,',
> especially since that has an established use.

I'm afraid that ship has sailed.  We need to find a solution to this
issue without going back.