bug#81630: 32.0.50; completions-format 'vertical scrolls the completion window on TAB tapping

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <[email protected]> Tue, 18 Aug 2026 13:34:42 -0400

Newsgroups	gmane.emacs.bugs
Message-ID	<[email protected]>

> @@ -1765,7 +1765,11 @@ completion--in-region-1
>              (with-selected-window window (scroll-down))))
>           ;; Normal tab
>           (t
> -          (if (pos-visible-in-window-p (point-max) window)
> +          (if (pos-visible-in-window-p
> +               (if (eq completions-format 'vertical)
> +                   (1- (point-max))     ; Vertical format has final newline.
> +                 (point-max))
> +               window)
>                ;; If end is in view, scroll up to the end.
>                (set-window-start window (point-min) nil)
>              ;; Else scroll down one screen.

Rather than test `completions-format`, we should test if the last char
is a LF.


=== Stefan