bug#68929: [PATCH] Copy which-key from GNU ELPA into core

[Eli Zaretskii]

> From: Jeremy Bryant <jb@jeremybryant.net>
> Cc: 68929@debbugs.gnu.org, monnier@iro.umontreal.ca, justin@burkett.cc
> Date: Thu, 08 Feb 2024 22:27:58 +0000
> 
> Defcustom is covered below
> "
> New defcustom's should always have a ':version' tag stating the first
> Emacs version in which they will appear.  Likewise with defcustom's
> whose value is changed -- update their ':version' tag.
> "
> 
> Is defface conceptually close enough not to warrant an extra para?

No, it's an omission, now fixed.

Thanks.