bug#57201: 29.0.50; Input method doesn't work in Term char mode

[Akib Azmain Turja]

In Term, input method doesn't work in char mode.  However, it works fine
in line mode.  I think it has something to do with read-only-ness.


To reproduce the bug:

1. Start Emacs with "emacs -Q".
2. Run Term with "M-x term RET"
3. Switch to line mode with "C-c C-j".  The buffer is writable now.
4. Change input method with "C-\".  (I have tested with
   programmer-dvorak and bengali-probhat.)
5. Try to write something.  Input method should work.
6. Switch to char mode with "C-c C-k".  The buffer is read-only now.
7. Try to write something again.  Input method no longer works.

------------------------------------------------------------------------

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo 
version 1.16.0)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Guix System

Configured using:
 'configure
 
CONFIG_SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash
 SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash
 
--prefix=/gnu/store/kbim2zycpr57xyj9dbh8r013srkaaif3-emacs-edge-29.0.50-1.686296b
 --enable-fast-install --with-native-compilation --with-sqlite3
 --with-xinput2 --with-xwidgets --with-modules --with-cairo
 --disable-build-details'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2 XPM XWIDGETS GTK3
ZLIB

Important settings:
  value of $EMACSLOADPATH: 
/home/akib/.guix-profile/share/emacs/site-lisp:/gnu/store/kbim2zycpr57xyj9dbh8r013srkaaif3-emacs-edge-29.0.50-1.686296b/share/emacs/29.0.50/lisp
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: Term

Minor modes in effect:
  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  diff-hl-margin-mode: t
  diff-hl-flydiff-mode: t
  gcmh-mode: t
  server-mode: t
  gtags-mode: t
  corfu-doc-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  corfu-mode: t
  isearch-mb-mode: t
  global-auto-revert-mode: t
  save-place-mode: t
  electric-pair-mode: t
  gc-buffers-mode: t
  which-key-mode: t
  marginalia-mode: t
  vertico-mode: t
  minibar-mode: t
  workroom-mode: t
  savehist-mode: t
  recentf-mode: t
  shackle-mode: t
  blow-mode: t
  leaf-key-override-global-mode: t
  el-patch-use-package-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  buffer-read-only: 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

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Features:
(ind-util two-column quail magit-core magit-autorevert magit-margin
magit-transient magit-process with-editor magit-mode transient magit-git
term ehelp emms-volume emms-volume-sndioctl emms-volume-mixerctl
emms-volume-pulse emms-volume-amixer emms-last-played emms-playlist-mode
emms-source-playlist emms-source-file locate emms-player-mpv
emms-playing-time emms-info emms-later-do emms-player-simple emms
emms-compat magit-base magit-section crm compat-27 compat-26 shadow
emacsbug find-dired ffap grep smerge-mode flow-fill gnus-fun dired-aux
vc-hg vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs diredfl cape hi-lock
misearch multi-isearch checkdoc consult-vertico consult compat-28
kind-icon svg-lib gnus-bcklg shell epa-file gnus-async mailalias
smtpmail qp highlight-defined package-lint-flymake package-lint
let-alist finder lisp-mnt paredit highlight-quoted aggressive-indent
highlight-numbers parent-mode highlight-indent-guides highlight-thing
flymake-popon posframe popon flymake-proc flymake compile org-element
avl-tree generator ol-eww ol-rmail ol-mhe ol-irc ol-info ol-gnus
ol-docview doc-view image-mode exif ol-bibtex ol-bbdb ol-w3m ol-doi
org-link-doi org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro
org-footnote org-src ob-comint org-pcomplete pcomplete org-list
org-faces org-entities noutline outline org-version ob-emacs-lisp
ob-core ob-eval org-table oc-basic bibtex ol org-keys oc org-compat
advice org-macs org-loaddefs cal-menu calendar cal-loaddefs ecomplete
vc-git diff-hl-margin diff-hl-dired diff-hl-flydiff diff diff-hl
log-view pcvs-util vc-dir ewoc vc vc-dispatcher diff-mode why-this bbdb
bbdb-site timezone eudc-capf eudc cus-start eudc-vars gnus-cite
mail-extr footnote flyspell ispell display-fill-column-indicator
ws-butler hl-todo compat sort gnus-ml nndraft nnmh mm-archive
gnus-search eieio-opt speedbar ezimage dframe nnrss nnselect nnmaildir
nnfolder nnnil gnus-agent gnus-srvr gnus-score score-mode nnvirtual
gnus-msg gnus-art mm-uu mml2015 mm-view mml-smime smime dig nntp
gnus-cache gnus-sum gnus-group gnus-undo gnus-start gnus-dbus gnus-cloud
nnimap nnmail mail-source utf7 nnoo gnus-spec gnus-int gnus-range
message sendmail yank-media dired dired-loaddefs rfc822 mml mml-sec epa
derived epg rfc6068 epg-config mm-decode mm-bodies mm-encode mailabbrev
gmm-utils mailheader gnus-win lin hl-line display-line-numbers sh-script
smie executable rng-xsd xsd-regexp rng-cmpct rng-nxml rng-valid rng-loc
rng-uri rng-parse nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns
nxml-mode nxml-outln nxml-rap sgml-mode facemenu nxml-util nxml-enc
xmltok sql view shr-color color elisp-demos info-colors
rainbow-delimiters helpful imenu edebug debug backtrace info-look
find-func f f-shortdoc shortdoc elisp-refs s dash parse-time iso8601
cc-awk cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align
cc-engine cc-vars cc-defs shr-tag-pre-highlight language-detection
jka-compr textsec uni-scripts idna-mapping ucs-normalize uni-confusable
textsec-check gnutls network-stream url-http mail-parse rfc2231 rfc2047
rfc2045 ietf-drums url-gw nsm url-cache url-auth format-spec face-remap
iwindow eww xdg url-queue thingatpt shr pixel-fill kinsoku url-file svg
dom puny mm-url gnus nnheader gnus-util mail-utils range mm-util
mail-prsvr dmenu comint ansi-color mode-line-bell battery dbus xml
mule-util orderless mb-depth pinentry time-date modus-vivendi-theme
modus-themes gcmh init comp comp-cstr warnings exwm-xim xcb-xim xcb-xlib
exwm-randr xcb-randr exwm exwm-input xcb-keysyms xcb-xkb exwm-manage
exwm-floating xcb-cursor xcb-render exwm-layout exwm-workspace exwm-core
xcb-ewmh xcb-icccm xcb xcb-xproto xcb-types xcb-debug server
auth-source-pass gtags-mode files-x xref project corfu-doc corfu-history
corfu isearch-mb autorevert filenotify saveplace elec-pair gc-buffers
which-key marginalia vertico minibar workroom bookmark
text-property-search disp-table savehist recentf tree-widget shackle
trace blow edmacro kmacro pcase cl-extra cus-edit pp cus-load icons
wid-edit leaf finder-inf vterm-autoloads guix-emacs cape-autoloads
corfu-autoloads crux-autoloads easy-mmode el-patch el-patch-stub
eldoc-autoloads async-autoloads consult-autoloads forge-autoloads
geiser-impl help-fns radix-tree help-mode geiser-custom geiser-base ring
ghub-autoloads rx geiser-autoloads magit-autoloads git-commit-autoloads
mastodon-autoloads modus-themes-autoloads notmuch-autoloads
nov-autoloads org-roam-ui-autoloads org-roam-autoloads
magit-section-autoloads sx-autoloads transient-autoloads
vertico-autoloads which-key-autoloads with-editor-autoloads info
compat-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 url-handlers url-parse auth-source cl-seq eieio
eieio-core cl-macs password-cache json subr-x map byte-opt gv bytecomp
byte-compile cconv url-vars cl-loaddefs cl-lib rmc iso-transl tooltip
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
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 xwidget-internal dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit xinput2 x multi-tty
make-network-process native-compile emacs)

Memory information:
((conses 16 1595061 1542781)
 (symbols 48 78516 38)
 (strings 32 426498 348967)
 (string-bytes 1 18135029)
 (vectors 16 371565)
 (vector-slots 8 4433776 1739465)
 (floats 8 91674 4306)
 (intervals 56 54985 20784)
 (buffers 992 61))

-- 
Akib Azmain Turja

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