bug#43283: feature request: new value for completions-format

[Lars Ingebrigtsen]

Nicolas Graner <nicolas.graner@universite-paris-saclay.fr> writes:

> In addition to the 'horizontal' and 'vertical' completion formats, it
> would be useful to have a 'single-column' format that displays
> completions vertically, one per line, regardless of the window width.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

This was added a few months later by this commit:

commit b5e34c34bcd81a0f261a5ee6dedaf51261ae5025
Author:     Juri Linkov <juri@linkov.net>
AuthorDate: Wed Nov 25 22:24:11 2020 +0200

    * lisp/minibuffer.el (completions-format): Add new value 'one-column'.


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