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

[Juri Linkov]

>> 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.

It's not only about the minibuffer, but also about completions,
so the commands names should also include the word "completion".

>> > 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?

PgUp and PgDn are used to scroll the completions buffer from the minibuffer.

>> 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.

It does the same as icomplete-vertical-mode where the arrow keys
are not confusing.