bug#51530: 28.0.50; allout cannot advance to next visible heading

[Edmund Kademan]

When you:
  - are in allout mode and
  - are not truncating lines and
  - have your cursor on the heading of an entry that contains a line so
    long that it wraps around to the left margin and
  - try to run the command allout-next-visible-heading (C-c C-o C-a C-n)
the command never completes.

In GNU Emacs 28.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo 
version 1.16.0)
 of 2021-09-23 built on ejk-XPS-13-9310
Repository revision: 636e082e451aacb881a94b6c5b3dafb15d7eaa3d
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Ubuntu 20.04.2 LTS (fossa-bulbasaur X55)

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: ELisp/d

Minor modes in effect:
  allout-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  selectrum-prescient-mode: t
  prescient-persist-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  paredit-mode: t
  show-paren-mode: t
  selectrum-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: allout-auto-fill
  transient-mark-mode: t
  abbrev-mode: t

Load-path shadows:
/home/ejk/.emacs.d/elisp/json hides /usr/local/share/emacs/28.0.50/lisp/json
/home/ejk/.emacs.d/elpa/transient-20211013.2148/transient hides 
/usr/local/share/emacs/28.0.50/lisp/transient

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Memory information:
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