From: Eli Zaretskii <eliz@gnu.org>
To: Gregory Heytings <ghe@sdf.org>
Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: A solution to display completion candidates after point in a minibuffer
Date: Sun, 04 Oct 2020 19:21:51 +0300 [thread overview]
Message-ID: <83o8lidkrk.fsf@gnu.org> (raw)
In-Reply-To: <alpine.NEB.2.22.394.2010041743170453.3982@sdf.lonestar.org> (message from Gregory Heytings on Sun, 04 Oct 2020 16:11:06 +0000)
> Date: Sun, 04 Oct 2020 16:11:06 +0000
> From: Gregory Heytings <ghe@sdf.org>
> cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
>
> > No, redisplay will never accept a result that point is invisible. If it
> > ever does display such situations, it's a bug that needs to be fixed.
>
> Never say never...
>
> >> It becomes visible again after the next redisplay, a second or two
> >> later.
> >
> > If such a situation exists, please describe how to reproduce it, because
> > it's a bug we need to fix. Emacs should never display a window where
> > point is not fully visible.
> >
>
> Here's a recipe:
>
> emacs -Q
> (defun recipe ()
> (interactive)
> (set-frame-width nil 80)
> (set-frame-height nil 30)
> (switch-to-buffer (get-buffer-create "*Recipe*"))
> (goto-char 1)
> (let ((i 0)) (while (< i 60) (setq i (1+ i)) (insert (format "L%d\n" i))))
> (goto-char 148)
> (sit-for 0.25)
> (add-hook 'window-scroll-functions (lambda (&rest args) (set-window-start nil 1)))
> (forward-line 13))
> M-x recipe
> press C-n
AFAIU, this is exactly why we say not to use window-scroll-functions
for this purpose. IOW, there is indeed a bug here, and the bug is in
the Lisp code you presented: window-scroll-functions are not meant to
be used to affect redisplay, they are meant to inform Lisp programs
about what redisplay is about to do with a window.
next prev parent reply other threads:[~2020-10-04 16:21 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-02 15:36 A solution to display completion candidates after point in a minibuffer Gregory Heytings via Emacs development discussions.
2020-10-02 16:04 ` Eli Zaretskii
2020-10-02 16:14 ` Gregory Heytings via Emacs development discussions.
2020-10-02 16:20 ` Eli Zaretskii
2020-10-02 16:32 ` Stefan Monnier
2020-10-02 17:17 ` Gregory Heytings via Emacs development discussions.
2020-10-02 19:24 ` Stefan Monnier
2020-10-02 20:18 ` Drew Adams
2020-10-02 21:30 ` Gregory Heytings via Emacs development discussions.
2020-10-02 22:44 ` Stefan Monnier
2020-10-02 23:11 ` Gregory Heytings via Emacs development discussions.
2020-10-03 0:10 ` Stefan Monnier
2020-10-03 6:59 ` Gregory Heytings via Emacs development discussions.
2020-10-03 9:04 ` Eli Zaretskii
2020-10-04 16:11 ` Gregory Heytings via Emacs development discussions.
2020-10-04 16:21 ` Eli Zaretskii [this message]
2020-10-04 16:52 ` Gregory Heytings via Emacs development discussions.
2020-10-04 17:00 ` Eli Zaretskii
2020-10-03 8:25 ` Eli Zaretskii
2020-10-03 8:07 ` Eli Zaretskii
2020-10-02 22:40 ` Gregory Heytings via Emacs development discussions.
2020-10-03 12:31 ` Gregory Heytings via Emacs development discussions.
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