bug#19468: 25.0.50; UI inconveniences with M-.

[Eli Zaretskii]

> Date: Wed, 29 Apr 2015 00:59:46 +0300
> From: Dmitry Gutov <dgutov@yandex.ru>
> CC: monnier@iro.umontreal.ca, 19468@debbugs.gnu.org
> 
> But anyway, I've just opened lisp/TAGS, and I haven't been able to make 
> `(tag-exact-match-p "...")' return t with any input and position I've tried.

Probably because most tags have implicit names, so you need
tag-implicit-name-match-p.  For exact matches, try edit-abbrevs-map or
allout-item-widget.  See etc/ETAGS.EBNF for more details about
explicit and implicit tag names.