bug#65583: 30.0.50; rainbow-mode highlights quoted text in man pages

[Davide Masserut]

When rainbow-mode is enabled in buffers displaying man pages (both 
man and woman), the `font-lock-string-face` is applied to text 
between quotes.  AFAIK, man pages don't require the use of closing 
quotes which causes entire sections to interpreted as if they were 
quoted strings.

To reproduce this, install and load the package, then:

(add-hook 'Man-mode-hook #'rainbow-mode)
(man "git-config(1)")

Scroll up until you see the wrongly fontified text.


One way to mitigate this is to add

(modify-syntax-entry ?\" "." table)

to the syntax tables.



In GNU Emacs 30.0.50 (build 7, x86_64-pc-linux-gnu, GTK+ Version
3.24.38, cairo version 1.17.8) of 2023-08-28 built on T480s
Repository revision: 36ddabd59cb949c63d4036170f0fc97a6333a410
Repository branch: master
System Description: Arch Linux

Configured using:
'configure -C --prefix /home/davide/.local --with-pgtk
--with-native-compilation --enable-link-time-optimization
--enable-locallisppath=/usr/share/emacs/site-lisp/
'CFLAGS=-march=native -O2''
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ 
JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY 
INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB
Important settings:
 value of $LC_TIME: en_GB.UTF-8
 value of $LANG: en_US.UTF-8
 locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
 TeX-PDF-mode: t
 denote-modules-global-mode: t
 global-git-commit-mode: t
 magit-auto-revert-mode: t
 mu4e-modeline-mode: t
 save-place-mode: t
 global-diff-hl-mode: t
 diff-hl-mode: t
 global-auto-revert-mode: t
 server-mode: t
 electric-pair-mode: t
 display-line-numbers-mode: t
 display-fill-column-indicator-mode: t
 flymake-mode: t
 rainbow-mode: t
 recentf-mode: t
 corfu-popupinfo-mode: t
 corfu-history-mode: t
 global-corfu-mode: t
 corfu-mode: t
 marginalia-mode: t
 vertico-multiform-mode: t
 vertico-mouse-mode: t
 vertico-mode: t
 winner-mode: t
 repeat-mode: t
 override-global-mode: t
 savehist-mode: t
 pixel-scroll-precision-mode: t
 minibuffer-depth-indicate-mode: t
 tooltip-mode: t
 global-eldoc-mode: t
 eldoc-mode: t
 show-paren-mode: t
 electric-indent-mode: t
 mouse-wheel-mode: t
 tab-bar-mode: t
 file-name-shadow-mode: t
 context-menu-mode: t
 global-font-lock-mode: t
 font-lock-mode: t
 undelete-frame-mode: t
 size-indication-mode: t
 column-number-mode: t
 line-number-mode: t
 transient-mark-mode: t
 auto-composition-mode: t
 auto-encryption-mode: t
 auto-compression-mode: t
 temp-buffer-resize-mode: t

Load-path shadows:
/home/davide/.emacs.d/elpa/embark-consult-0.7/embark-org hides 
/home/davide/.emacs.d/elpa/embark-0.22.1/embark-org
~/src/org-pomodoro/org-pomodoro hides 
/home/davide/.emacs.d/elpa/org-pomodoro-20220318.1618/org-pomodoro
~/src/org-pomodoro/org-pomodoro-autoloads hides 
/home/davide/.emacs.d/elpa/org-pomodoro-20220318.1618/org-pomodoro-autoloads
~/src/org-pomodoro/org-pomodoro-pkg hides 
/home/davide/.emacs.d/elpa/org-pomodoro-20220318.1618/org-pomodoro-pkg
/home/davide/.emacs.d/elpa/transient-20230825.2019/transient hides 
/home/davide/.local/share/emacs/30.0.50/lisp/transient

Features:
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fileloop js c-ts-common cc-mode cc-fonts cc-guess cc-menus cc-cmds
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texinfo texinfo-loaddefs wgrep grep oc-basic disp-table org-mouse 
ol-eww
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nnselect
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ol-w3m
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finder-inf sort shortdoc delsel jka-compr consult-info rect 
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vundo-autoloads wgrep-autoloads with-editor-autoloads info
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yaml-mode-autoloads
package browse-url url url-proxy url-privacy url-expand 
url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util 
mailcap
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password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc 
paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode 
mwheel
term/pgtk-win pgtk-win term/common-win pgtk-dnd touch-screen 
tool-bar
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newcomment
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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
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vietnamese
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romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
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loaddefs
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pgtk
lcms2 multi-tty move-toolbar make-network-process native-compile 
emacs)

Memory information:
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(strings 32 336256 13021) (string-bytes 1 12766412)
(vectors 16 117373) (vector-slots 8 2592801 222067)
(floats 8 852 6676) (intervals 56 197669 1396) (buffers 992 48))