When you call `describle-variable' on a variable with a value that's

large enough that it's moved to the end of the help buffer, the syntax

table is changed to `emacs-lisp-mode-syntax-table' but never changed

back. There is a very easy fix where you just set it back to

`help-mode-syntax-table' at the end of the enclosing

`with-current-buffer', but I guess you could also switch to a

temporary buffer instead. Below is the relevant code snippet with the

first suggested fix applied.

;; If the value is large, move it to the end.

(with-current-buffer standard-output

      (when (> (count-lines (point-min) (point-max)) 10)

            ;; Note that setting the syntax table like below

            ;; makes forward-sexp move over a `'s' at the end

            ;; of a symbol.

            (set-syntax-table emacs-lisp-mode-syntax-table)

            (goto-char val-start-pos)

            (when (looking-at "value is") (replace-match ""))

            (save-excursion

              (insert "\n\nValue:")

      (setq-local help-button-cache (point-marker)))

            (insert "value is shown ")

            (insert-button "below"

                               'action help-button-cache

                               'follow-link t

                               'help-echo "mouse-2, RET: show value")

            (insert ".\n")

    (set-syntax-table help-mode-syntax-table)))

Thank you very much for all your work. I absolutely adore Emacs.

Kind regards,

In GNU Emacs 30.0.91 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo

version 1.18.2, Xaw3d scroll bars)

Windowing system distributor 'The X.Org Foundation', version 11.0.12101013

System Description: NixOS 24.11 (Vicuna)

Configured using:

 'configure

 --prefix=/nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91

 --disable-build-details --with-modules --with-x-toolkit=lucid

 --with-cairo --with-xft --with-compress-install

 --with-toolkit-scroll-bars --with-native-compilation

 --without-imagemagick --with-mailutils --without-small-ja-dic

 --with-tree-sitter --with-xinput2 --without-xwidgets --with-dbus

 --with-selinux'

Configured features:

CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM 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 XAW3D XDBE XIM XINPUT2 XPM

LUCID ZLIB

Important settings:

  value of $EMACSLOADPATH: /nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp:

  value of $EMACSNATIVELOADPATH: /nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/native-lisp:

  value of $LANG: en_US.UTF-8

  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:

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/external-completion-0.1/external-completion hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/external-completion

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/jsonrpc-1.0.25/jsonrpc hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/jsonrpc

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/transient-20240819.1250/transient hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/transient

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/eglot-1.17/eglot hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/progmodes/eglot

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/project-0.11.1/project hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/progmodes/project

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/xref-1.7.0/xref hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/progmodes/xref

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/flymake-1.3.7/flymake hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/progmodes/flymake

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/compat-30.0.0.0/compat hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/emacs-lisp/compat

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/seq-2.24/seq hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/emacs-lisp/seq

/nix/store/ml4x8pxvz40klw1yabgbjrrpjxlgbbb0-emacs-packages-deps/share/emacs/site-lisp/elpa/eldoc-1.15.0/eldoc hides /nix/store/6qc388fy8gl95smi8q0az92d558nkp4k-emacs-30.0.91/share/emacs/30.0.91/lisp/emacs-lisp/eldoc

Features:

(mailalias rmail auth-source cl-seq eieio eieio-core cl-macs icons json

map byte-opt gv bytecomp byte-compile thingatpt help-fns radix-tree

help-mode pp 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 time-date subr-x

mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils

mailheader cl-loaddefs cl-lib sendmail rfc2047 rfc2045 ietf-drums

mm-util mail-prsvr mail-utils 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 x-toolkit

xinput2 x multi-tty move-toolbar make-network-process native-compile

emacs)

Memory information:

((conses 16 83734 22304) (symbols 48 7341 9) (strings 32 24215 2414)

 (string-bytes 1 761000) (vectors 16 14459)

 (vector-slots 8 178912 15298) (floats 8 32 11) (intervals 56 330 0)