On Thu, Feb 4, 2016 at 8:48 PM John Wiegley <jwiegley@gmail.com> wrote:

> How long have we had both?


The "C-x w" bindings have been since the origin! of hi-lock.el on
2000-08-02, added by Gerd Moellmann (
http://git.savannah.gnu.org/cgit/emacs.git/commit/?h=emacs-25&id=abb2db1cf3b6505afedcafb51e6f8dca36585b9c
 ).

The "M-s h" bindings came later on 2008-06-25, added by Juri (
http://git.savannah.gnu.org/cgit/emacs.git/commit/?h=emacs-25&id=56d62ee1fba23e69035e5146a12323cdfb60ea9b
 ).

In another thread on emacs-devel, I learnt that Alan Mackenzie is using the
"C-x w" bindings. So I don't know .. what would be a good way to poll this?