From: Gregory Heytings via "Emacs development discussions." <emacs-devel@gnu.org>
To: Eli Zaretskii <eliz@gnu.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 16:11:06 +0000 [thread overview]
Message-ID: <alpine.NEB.2.22.394.2010041743170453.3982@sdf.lonestar.org> (raw)
In-Reply-To: <83sgavfzno.fsf@gnu.org>
>>>> I don't know, but I'm not sure about that. If you (set-window-start
>>>> nil 1) unconditionally in window-scroll-functions, this setting will
>>>> be obeyed by redisplay, even if point is not visible anymore.
>>>
>>> Oh, indeed, in that case it would move point instead.
>>
>> No, that's not what I meant. In that case redisplay does not scroll
>> and does not move point. Point simply becomes invisible.
>
> 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
You will see the cursor on the first line, after "L1", but in fact point
is at that moment not visible anymore, it is still on "L54". A second or
two later, point has actually moved, and you will see the cursor blinking
on "L14". This works at least with Emacs 23, 24, 25, 26, 27 and 28.
The bug is more visible with Emacs 23 and 24, because you don't see the
cursor on the first line after pressing C-n, you see a window without any
cursor during a second or two. With Emacs 25, 26, 27 and 28 the cursor
after "L1" does not correspond to point (and as far as I understand does
not correspond to anything).
next prev parent reply other threads:[~2020-10-04 16:11 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. [this message]
2020-10-04 16:21 ` Eli Zaretskii
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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