bug#59486: completion-auto-wrap disobeyed by vertical navigation

[Eli Zaretskii <eliz@gnu.org>]

> From: Juri Linkov <juri@linkov.net>
> Cc: 59486@debbugs.gnu.org
> Date: Thu, 24 Nov 2022 20:30:00 +0200
> 
> > I don't really understand the difference between minibuffer-previous-* and
> > minibuffer-previous-line-* commands (the available documentation is minimal
> > and doesn't explain this difference), so it's hard to suggest an alternative.
> 
> minibuffer-previous-* are intended to navigate the completion list
> horizontally while the minibuffer is active, and minibuffer-previous-line-*
> vertically.

Then the names could be simplified as minibuffer-up-line and
minibuffer-down-line.  It will also make the names less confusing, IMO.

> > But one immediate alternative is to use <LEFT> and <RIGHT> for
> > the minibuffer-previous-* family, like previous-completion does.
> 
> <LEFT> and <RIGHT> are useful to move point in the minibuffer.

Then maybe PgUp and PgDn?

> But do you think it would be okay to use <LEFT> and <RIGHT>
> for navigation of completions from the minibuffer after
> adding a new user option, when is non-nil (disabled by default)?

If the arrow keys are already taken, having an option that will change their
effect would be confusing, I think.