bug#72710: 31.0.50; visual-wrap-prefix-mode freezes rendering in conjunction with diff-hl (fringe display)

["Mark Hepburn" <mark@markhepburn.com>]

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Turning on the recently-merged visual-wrap-prefix-mode while using the
fringe display of diff-hl (a mode to display uncommitted file changes in
the fringe area) causes rendering to completely freeze.  No backtrace is
reported, although subsequent visual-line-move commands produce an
error.  Emacs itself is responsive, so the file can be re-opened with
`find-alternate-file'.

To reproduce from emacs -Q:
* Install diff-hl (clone https://github.com/dgutov/diff-hl/, add to
load-path)
* open a file under version control
* M-x diff-hl-mode
* make some edits, ensure the fringe shows the lines highlighted (I
think it might need multiple lines affected)
* M-x visual-wrap-prefix-mode

For me the effect varies between a blank unresponsive buffer and a
buffer I can still see the contents (with the cursor frozen and
appearing unselected), but either way it is unusable.

It seems to be the fringe display; the same experiment with a clean file
had no effect.


In GNU Emacs 31.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version
3.24.41, cairo version 1.18.0) of 2024-08-18 built on x1carbon
Repository revision: 909d1d02db1c11e1309316cba2a392e1456e6053
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Ubuntu 24.04 LTS

Configured using:
'configure --with-native-compilation --without-mailutils
--with-xwidgets --with-tree-sitter --with-libsystemd
--prefix=/home/mark/.local'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER
PNG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER
WEBP X11 XDBE XIM XINPUT2 XPM XWIDGETS GTK3 ZLIB

Important settings:
  value of $LANG: en_AU.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Magit

Minor modes in effect:
  global-git-commit-mode: t
  magit-auto-revert-mode: t
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  windmove-mode: t
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  whole-line-or-region-global-mode: t
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  global-diff-hl-mode: t
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  column-number-mode: t
  line-number-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/mark/.emacs.d/elpa/which-key-20240620.2145/which-key hides /home/mark/.local/share/emacs/31.0.50/lisp/which-key
/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig-fnmatch hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig-fnmatch
/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig-core hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig-core
/home/mark/.emacs.d/elpa/transient-20240814.1922/transient hides /home/mark/.local/share/emacs/31.0.50/lisp/transient
/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig
/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig-core-handle hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig-core-handle
/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig-tools hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig-tools
/home/mark/.emacs.d/elpa/editorconfig-20240813.801/editorconfig-conf-mode hides /home/mark/.local/share/emacs/31.0.50/lisp/editorconfig-conf-mode
/home/mark/.emacs.d/elpa/hierarchy-20190425.842/hierarchy hides /home/mark/.local/share/emacs/31.0.50/lisp/emacs-lisp/hierarchy

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