bug#23426: 25.0.93; dired-do-find-regexp doesn't find newline

[Eli Zaretskii]

> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Wed, 4 May 2016 13:32:41 +0300
> Cc: 23426@debbugs.gnu.org, heinz@h-rommerskirchen.de
> 
> Or submit a patch that adds a fallback to xref-collect-matches to open 
> all files and parse them in Emacs. I think we'd accept it.

Indeed, patches to that effect are welcome.