GNU bug report logs - #47498
28.0.50; follow-mode misses a line with tiling window manager

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Package: emacs;

Reported by: Stefan Kangas <stefan <at> marxist.se>

Date: Tue, 30 Mar 2021 12:31:01 UTC

Severity: normal

Merged with 51590

Found in version 28.0.50

Done: Alan Mackenzie <acm <at> muc.de>

Bug is archived. No further changes may be made.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: stefan <at> marxist.se
Cc: 47498 <at> debbugs.gnu.org
Subject: bug#47498: 28.0.50; follow-mode misses a line with tiling window manager
Date: Tue, 30 Mar 2021 16:15:12 +0300

> Date: Tue, 30 Mar 2021 15:56:00 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 47498 <at> debbugs.gnu.org
> 
> From my POV, follow-mode's design is fundamentally flawed, when
> variable-size fonts and fractional line display are considered.

Oh, and let's not forget features like display properties and
overlays, which can disrupt the display continuity if they happen on
the last line of the left window and continue into the first line of
the right one.  That's because follow-mode works by forcing the
window's start point, but Emacs is unable to have the window-start
point in the middle of a display property or overlay string.
This bug report was last modified 3 years and 199 days ago.

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