bug#64689: 30.0.50; message-mode bug

[Devon Sean McCullough]

Typing my prior bug report, left-clicking the To:-line
beeps with the error message <tool-bar> <mouse-1> is undefined
and typing this bug report, it now errs on the Subject:-line as well
but not the From:-line nor the first two characters
of the To: and Subject: lines.

        Peace
            --Devon

P.S.  The info below is from my prior bug report:

In GNU Emacs 30.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version
 3.24.27, cairo version 1.16.0) of 2023-05-10 built on LQ
Repository revision: e4c8ba6c0589f1ba0ba9993c4f1e9c0821d3ca6c
Repository branch: master
System Description: PureOS 10 (Byzantium)

Configured using:
 'configure --with-pgtk'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ LIBSELINUX
MODULES NOTIFY INOTIFY PDUMPER PGTK PNG SECCOMP SOUND THREADS
TOOLKIT_SCROLL_BARS XIM GTK3 ZLIB

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

Major mode: Tar

Minor modes in effect:
  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
  buffer-read-only: 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 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 tar-mode arc-mode archive-mode jka-compr 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 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 pgtk multi-tty make-network-process emacs)

Memory information:
((conses 16 46611 11513)
 (symbols 48 5497 0)
 (strings 32 16893 1459)
 (string-bytes 1 478022)
 (vectors 16 12517)
 (vector-slots 8 186004 14041)
 (floats 8 26 296)
 (intervals 56 2802 5)
 (buffers 976 13))