bug#76193: 30.0.93; Wrong type argument in outline-minor-mode

[Roshan Shariff]

1. Open scratch buffer
2. M-: (setq outline-minor-mode-use-buttons 'in-margins) RET
3. M-: (setq left-margin-width 2) RET
4. M-x outline-minor-mode [Outline minor mode enabled in current buffer]
5. M-x outline-minor-mode [Wrong type argument: number-or-mark-p, nil]

The error happens on line 616 of outline.el, because
outline--margin-width is nil when outline-minor-mode is disabled.  It
turns out that it was never set when outline-minor-mode was enabled,
because the condition on line 552 fails when left-margin-width is greater than
zero.


In GNU Emacs 30.0.93 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.2) of 2025-02-09 built on
 3232d44b99d846d18b5ee0bbc269a171
Windowing system distributor 'The X.Org Foundation', version 11.0.12401005
System Description: Fedora Linux 41 (Workstation Edition)

Configured using:
 'configure --build=x86_64-redhat-linux --host=x86_64-redhat-linux
 --program-prefix= --disable-dependency-tracking --prefix=/usr
 --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
 --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include
 --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var
 --runstatedir=/run --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --program-suffix=-gtk+x11 --with-cairo
 --with-dbus --with-gif --with-gpm=no --with-harfbuzz --with-jpeg
 --with-modules --with-native-compilation=aot --with-png --with-rsvg
 --with-sqlite3 --with-tiff --with-tree-sitter --with-webp
 --with-x-toolkit=gtk3 --with-xinput2 --with-xpm
 build_alias=x86_64-redhat-linux host_alias=x86_64-redhat-linux CC=gcc
 'CFLAGS=-DMAIL_USE_LOCKF -O2 -flto=auto -ffat-lto-objects -fexceptions
 -g -grecord-gcc-switches -pipe -Wall -Werror=format-security
 -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64
 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
 -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer
 -mno-omit-leaf-frame-pointer ' 'LDFLAGS=-Wl,-z,relro -Wl,--as-needed
 -Wl,-z,pack-relative-relocs -Wl,-z,now
 -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -Wl,--build-id=sha1
 -specs=/usr/lib/rpm/redhat/redhat-package-notes ' CXX=g++ 'CXXFLAGS=-O2
 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
 -pipe -Wall -Werror=format-security
 -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64
 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
 -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer
 -mno-omit-leaf-frame-pointer '
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date subr-x
cl-extra pp cl-print byte-opt gv bytecomp byte-compile org-compat
org-macs format-spec noutline outline icons thingatpt help-fns
radix-tree help-mode cl-loaddefs cl-lib rmc iso-transl tooltip cconv
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/x-win x-win term/common-win x-dnd touch-screen
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq
simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting cairo
gtk x-toolkit xinput2 x multi-tty move-toolbar make-network-process
native-compile emacs)

Memory information:
((conses 16 77563 11261) (symbols 48 7193 0) (strings 32 22050 2967)
 (string-bytes 1 666318) (vectors 16 12369)
 (vector-slots 8 164396 8470) (floats 8 43 133) (intervals 56 426 0)
 (buffers 992 13))