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

[Eli Zaretskii <eliz@gnu.org>]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Sun, 03 Apr 2016 21:15:01 +0100
> 
> Why should this extra UI appear ?

Because it is an integral part of the feature.

> Emacs users who are accustomed to the existing facilities will find
> it annoying, and start filing bug reports about an obvious
> regression.

So you are saying that any new features that present a UI never used
before is a bug?

> By all means add new facilites with xref, but without loss of existing
> keybindings that many people have ingrained into muscle memory.

That's impossible, and you know it.  Not with features that are
explicitly meant to replace the old ones.

Anyway, all these opinions should have been brought up many moons ago,
when these features were added to the development sources, and perhaps
even earlier, when their design and implementation was discussed here.
Coming up now, after so much efforts was invested in improving this
and documenting it, it's really too late, unless we want to delay the
release of Emacs 25.1 by another year or so.  If you don't like some
aspects of this feature, the constructive way forward is to submit
patches.

Thanks.