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bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is ins
From: |
Eli Zaretskii |
Subject: |
bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay. |
Date: |
Wed, 09 Feb 2022 15:47:51 +0200 |
> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: larsi@gnus.org, esabof@gmail.com, 14582@debbugs.gnu.org
> Date: Wed, 09 Feb 2022 04:53:05 +0100
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > Neither do I, so there's something else at work here.
>
> I failed to find a recipe in half an hour and gave up for now - instead
> I found one for a very similar case of unexpected auto-scrolling that
> only appears when the new feature is turned on. Also seems to depend on
> the buffer contents. Maybe it is related and a fix fixes the other
> thing, too.
>
> emacs -Q
> 1 C-h i
> 2 move point to the beginning of one of the last visible lines.
> no scrolling happens (good).
> 3 M-: (setq make-window-start-visible t) RET => *info* buffer scrolled
>
> If you scroll back so that (point-min) becomes visible and repeat step
> 2 any activation of the minibuffer, e.g. just hitting M-: or C-x k,
> scrolls the *info* buffer.
>
> Doesn't happen in C-h n. Dunno what makes the difference - the fact
> that *info* is narrowed or that different fonts are used.
>
> Ah - wait, now I can reproduce the other thing, too:
>
> M-:
> (progn
> (setq-default display-time-interval 1.)
> (setq display-time-format "%H:%M:%S")
> (setq-default make-window-start-visible t)
> (display-time-mode +1))
> RET
> C-h i
> [down] [down] not too fast ... until it scrolls
You asked for it. Info buffers have a 'display' property whose value
is a string at the beginning of each node, and that 'display' property
makes the window's start point invisible. So whenever Emacs can make
the window-start visible, it does.
IOW, here you have one example why the default way of handling
"hidden" window-start point is sometimes exactly what we want.
Bottom line: I advise against making this the default.
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., (continued)
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/03
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/04
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/05
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/06
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/07
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/07
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/07
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/08
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/08
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/08
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay.,
Eli Zaretskii <=
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/09
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/10
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/10
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/11
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/11
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/12
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/12
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/13
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Michael Heerdegen, 2022/02/26
- bug#14582: 24.3.50.1; Strange overlay behavior, when window-start is inside an overlay., Eli Zaretskii, 2022/02/27