bug#64656: 29.0.91; Doc of minibuffer histories and completing-read - automatic addition of completions to DEFAULT list

[Eli Zaretskii]

> From: Drew Adams <drew.adams@oracle.com>
> CC: "64656@debbugs.gnu.org" <64656@debbugs.gnu.org>
> Date: Thu, 20 Jul 2023 16:45:26 +0000
> 
> Agree fully.  Let's see what Stefan, Juri,
> etc. think about the actual problem, leaving
> doc out of it till the behavior question is
> settled.

I actually decided to document this already.  This behavior exists
since Emacs 23.1(!!), so it's unlikely to go away soon, and it's high
time for it to be documented.

I leave this bug open for discussing the wisdom of adding all the
completion candidates in the likes of "C-h v".