Re: 'M-o' ('facemap-keymap') has now been removed until March 10th 2021

[Eli Zaretskii]

> Date: Fri, 19 Mar 2021 09:35:23 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: emacs-devel@gnu.org
> 
> > (FWIW, I'm a long-time and happy user of center-line, and was quite 
> > annoyed when it moved from its original M-s to a longer "M-o M-s", but 
> > that's water under the bridge.)
> 
> In which Emacs version was M-s bound to center-line?

All the versions up until 23.1.  From v23.1's NEWS:

  ** In Text mode, `center-line' and `center-paragraph' are rebound from
  `M-s' and `M-S' to global keys `M-o M-s' and `M-o M-S' on the global
  prefix map `M-o', which is intended for such formatting commands.