bug#66555: 29.1; ChangeLog font-lock wrong when it comes to sub-part / conditional components

bug#66555: 29.1; ChangeLog font-lock wrong when it comes to sub-part / conditional components

[Alfred M. Szmidt]

ChangeLog mode does the wrong thing when it comes to font-lock when
you have sub-part components or conditionals:

	* file.text (zork) <bar>
	(bork) <bar>: Some change.

	* file.text (zork) [foo]
	(bork) [bar]: Some change.

<foo> nor [foo] is not font-locked properly, the ChangeLog format
specifies the following:

|    Break long lists of function names by closing continued lines with
| ')', rather than ',', and opening the continuation with '('.  This makes
| highlighting in Emacs work better.  Here is an example:
| 
|      * src/keyboard.c (menu_bar_items, tool_bar_items)
|      (Fexecute_extended_command): Deal with 'keymap' property.

Moving the sub-part / conditional to before the function name also
does the wrong thing,

	* file.text <bar> (zork)
	(bork) <bar>: Some change.

	* file.text [foo] (zork)
	(bork) [bar]: Some change.

Now the function name is not font-locked.


In GNU Emacs 29.1 (build 1, aarch64-apple-darwin21.6.0, NS
 appkit-2113.60 Version 12.6.6 (Build 21G646)) of 2023-08-17 built on
 armbob.lan
Windowing system distributor 'Apple', version 10.3.2487
System Description:  macOS 14.0

Configured using:
 'configure --with-ns '--enable-locallisppath=/Library/Application
 Support/Emacs/${version}/site-lisp:/Library/Application
 Support/Emacs/site-lisp' --with-modules 'CFLAGS=-DFD_SETSIZE=10000
 -DDARWIN_UNLIMITED_SELECT' --with-x-toolkit=no'

Configured features:
ACL GLIB GMP GNUTLS JPEG JSON LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER
PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER ZLIB

Important settings:
  locale-coding-system: utf-8-unix

Major mode: Change Log

Minor modes in effect:
  shell-dirtrack-mode: t
  rcirc-track-minor-mode: t
  global-company-mode: t
  company-mode: t
  tooltip-mode: t
  global-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
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
~/loaddefs hides /Applications/Emacs.app/Contents/Resources/lisp/loaddefs
/Users/ams/.emacs.d/elpa/transient-0.4.1/transient hides /Applications/Emacs.app/Contents/Resources/lisp/transient

Features:
(shadow emacsbug bug-reference cal-china lunar solar cal-dst cal-bahai
cal-islam cal-hebrew holidays holiday-loaddefs ibuf-ext ibuffer
ibuffer-loaddefs tar-mode locate pcmpl-gnu image-mode exif macros rect
warnings python compat tabify imenu man nroff-mode shortdoc novice
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texinfo-loaddefs mailalias tramp-cache time-stamp tramp-sh tramp
tramp-loaddefs trampver tramp-integration tramp-compat format-spec
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diary-loaddefs face-remap dabbrev markdown-mode pcmpl-unix sh-script
rx treesit executable smerge-mode vc-hg vc-git diff-mode vc-bzr vc-src
vc-sccs vc-cvs vc-rcs vc-dir ewoc conf-mode cc-mode cc-fonts cc-guess
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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 kqueue
cocoa ns multi-tty make-network-process emacs)

Memory information:
((conses 16 1689816 1290001)
 (symbols 48 75704 20)
 (strings 32 212457 56530)
 (string-bytes 1 7143931)
 (vectors 16 77270)
 (vector-slots 8 1863751 427751)
 (floats 8 1119 789)
 (intervals 56 112004 220835)
 (buffers 984 129))