GNU bug report logs - #73933
30.0.91; Crash on scrolling in buffer with image at the end

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Message #13 received at 73933-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: misohena <at> gmail.com
Cc: 73933-done <at> debbugs.gnu.org
Subject: Re: bug#73933: 30.0.91;
 Crash on scrolling in buffer with image at the end
Date: Sun, 27 Oct 2024 13:46:41 +0200

> Cc: 73933 <at> debbugs.gnu.org
> Date: Mon, 21 Oct 2024 20:44:39 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > From: AKIYAMA Kouhei <misohena <at> gmail.com>
> > Date: Tue, 22 Oct 2024 00:14:38 +0900
> > 
> > 
> > If there is an image at the end of the buffer and only part of it is
> > visible at the bottom of the window, scrolling with C-v can cause a
> > crash. I noticed this when using image-dired or org-mode (when
> > displaying inline images).
> > 
> > After investigating the minimum configuration for the problem to
> > occur, I found that it occurs when the scroll-preserve-screen-position
> > variable is set to t and winner-mode is used.
> > 
> > In my environment (Windows 10), the problem can be reproduced 100%
> > with the following steps.
> > 
> > 1. Download
> >    https://alpha.gnu.org/gnu/emacs/pretest/windows/emacs-30/emacs-30.0.91.zip
> >    and unzip it.
> > 
> > 2. Open the bin directory and type emacs -Q from the command prompt to
> >    start Emacs.
> > 
> > 3. Paste the following code into the scratch buffer and evaluate it.
> > 
> > (progn
> >   ;; Minimal configuration
> >   (setq scroll-preserve-screen-position t)
> >   (winner-mode)
> > 
> >   ;; Reproduce the situation where the problem occurs
> >   ;; (There is an image at the end of the buffer, and only half of it
> >   ;; is visible.)
> >   (switch-to-buffer (generate-new-buffer "*TEST*"))
> >   ;;(setq line-spacing 0)
> >   (dotimes (_ (- (window-body-height) 4))
> >     (insert "\n"))
> >   (require 'svg)
> >   (let ((svg (svg-create 300 200)))
> >     (svg-rectangle svg 0 0 300 200 :fill "red")
> >     (svg-insert-image svg))
> >   (goto-char (point-min))
> > 
> >   ;; Crash
> >   (scroll-up-command))
> > 
> > When evaluated, the "Emacs Abort Dialog" will be displayed. The
> > following message will be displayed in the command prompt:
> 
> Thanks.  This 24-year old thinko should now be fixed on the emacs-30
> branch.

No further comments, so I'm now closing this bug.

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