bug#62898: 29.0.90; X can’t be input by the current input method [chinese-ctlaub]

[Van Ly <van.ly@sdf.org>]

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Where X is character codepoint

 #x6a58
 #x6a59

with chinese-ctlaub set the current input method, quail-show-key has

 #x6a58 => X can’t be input by the current input method
 #x6a59 => To input ‘X’, type "chaang"

Steps to reproduce
 - emacs -Q
 - switch to buffer in plain Fundamental mode, C-x b bbb
 - M-x set-input-method RET chinese-ctlaub
 - mouse copy, paste the two symbols from chart at row 1, column 2 and 3
 - put cursor over symbol and apply M-x quail-show-key

chart from Shuowen's tree section
 - https://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/shuowenRadical.php?rad=%E6%9C%A8

unexpected result
 - the current input method won't learn new input key sequence for symbol

expected result
 - the current input method learns new input key sequence for symbol

The current input method being chinese-ctlaub learns a new input key
sequence for symbol flowing the way a word that does not occur in the
wordlist can be added for future personal spell checking.


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In GNU Emacs 29.0.90 (build 1, aarch64-unknown-linux-gnu, GTK+ Version
 3.24.24, cairo version 1.16.0) of 2023-04-12 built on x23
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

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

Important settings:
  value of $LC_ALL: C.UTF-8
  value of $LANG: en_AU.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  text-scale-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
  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
sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
cus-start cus-load quail help-mode cl-loaddefs cl-lib format-spec
face-remap 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 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 move-toolbar gtk x-toolkit xinput2 x multi-tty
make-network-process emacs)

Memory information:
((conses 16 49435 7859)
 (symbols 48 6411 0)
 (strings 32 21822 2048)
 (string-bytes 1 442906)
 (vectors 16 10717)
 (vector-slots 8 185171 13341)
 (floats 8 27 19)
 (intervals 56 230 1)
 (buffers 984 13))