Dear Emacs maintainer(s), I am running into an unusual bug of sorts. That is: The behaviour of the compose key is incorrect when the locale is set to "eo" (Esperanto). The exact behaviour is as follows: - When running `XMODIFIERS="" emacs`, ` a e` does not produce æ. It simply produces nothing. ` ' e` correctly produces é, however. - When running `XMODIFIERS=@im=ibus emacs` (my default), simply pressing the compose key results in ` is undefined`. Emacs is (almost) the only program where this happens. The only other program that reliably fails on the same sequences is xterm. xterm results in the same behaviour for both `XMODIFIERS` values. All other programs (Firefox, LibreOffice, gedit, Yakuake, etc.) function correctly. But, when I run `LC_ALL=en_GB.UTF-8 emacs`, the behaviour is as expected: All compose key sequences just work. The same is true for running xterm with the en_GB.UTF-8 locale. I am running Debian Buster with GNOME on Wayland. The bug occurs with a vanilla .emacs.d/ folder. I have ibus installed and running, but also without ibus running, I run into the first of the two items. Because it happens on both Emacs and xterm, I suspect that this bug may not be exclusive to Emacs, but I am hoping that someone with a better understanding than I could point me in the right direction. Thank you very much. Yours sincerely, Carmen In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.20) of 2017-09-12, modified by Debian built on trouble Windowing system distributor 'The X.Org Foundation', version 11.0.11905000 System Description: Debian GNU/Linux testing (buster) Configured using: 'configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/emacs25-XrMyQe/emacs25-25.2+1=. -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 Important settings: value of $LANG: eo value of $XMODIFIERS: @im=ibus locale-coding-system: iso-latin-3-unix Major mode: Fundamental Minor modes in effect: tooltip-mode: t global-eldoc-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 blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t buffer-read-only: t line-number-mode: t transient-mark-mode: t Recent messages: Loading debian-ispell...done Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...done Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...done Loading /etc/emacs/site-start.d/50latex-cjk-common.el (source)... Loading cjk-enc...done Loading /etc/emacs/site-start.d/50latex-cjk-common.el (source)...done Loading /etc/emacs/site-start.d/50latex-cjk-thai.el (source)...done Loading /etc/emacs/site-start.d/50mu4e.el (source)...done Loading /etc/emacs/site-start.d/50texlive-lang-english.el (source)...done For information about GNU Emacs and the GNU system, type C-h C-a. scroll-up-command: End of buffer [2 times] Load-path shadows: /usr/share/emacs25/site-lisp/cmake-data/cmake-mode hides /usr/share/emacs/site-lisp/cmake-mode /usr/share/emacs/25.2/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup /usr/share/emacs25/site-lisp/latex-cjk-thai/thai-word hides /usr/share/emacs/25.2/lisp/language/thai-word Features: (shadow sort mail-extr emacsbug message dired format-spec rfc822 mml mml-sec password-cache epg gnus-util mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util help-fns mail-prsvr mail-utils finder-inf package epg-config seq byte-opt gv bytecomp byte-compile cl-extra help-mode easymenu cconv cl-loaddefs pcase cl-lib time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cl-generic 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 charscript case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote dbusbind inotify dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty make-network-process emacs) Memory information: ((conses 16 99825 4821) (symbols 48 21198 0) (miscs 40 92 117) (strings 32 19586 4935) (string-bytes 1 552873) (vectors 16 14014) (vector-slots 8 455925 4133) (floats 8 191 4) (intervals 56 387 267) (buffers 976 18))