bug#54374: 29.0.50; previous-completion fails at beginning of completions buffer

[Juri Linkov <juri@linkov.net>]

> This seems to fix it:
>
> diff --git a/lisp/simple.el b/lisp/simple.el
> index accc119e2b..7d47aba1ee 100644
> --- a/lisp/simple.el
> +++ b/lisp/simple.el
> @@ -9125,7 +9125,7 @@ next-completion
>          (unless (get-text-property (point) 'mouse-face)
>            (goto-char (next-single-property-change (point) 'mouse-face nil end)))
>          (setq n (1- n)))
> -      (while (< n 0)
> +      (while (and (< n 0) (< 1 (point)))
>          (let ((prop (get-text-property (1- (point)) 'mouse-face)))
>            ;; If in a completion, move to the start of it.
>            (when (and prop (eq prop (get-text-property (point) 'mouse-face)))

Thanks, I confirm that it doesn't fail.

However, there is some strange behaviour: when point is at the beginning
of the completion buffer, then previous-completion switches to the minibuffer.
But if point is at the first completion, then previous-completion wraps
to the last completion.  Shouldn't point at the beginning of the buffer
wrap to the last completion as well?