GNU bug report logs - #56117
29.0.50; pgtk does not distinguish between <kp-separator> and "."/","

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thomas Schneider <qsx <at> chaotikum.eu>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; pgtk does not distinguish between <kp-separator> and "."/","
Date: Tue, 21 Jun 2022 01:02:33 +0200

Dear maintainers,

With “classic” X11 support in Emacs and GTK (probably the others, too),
pressing the keypad separator ("," on, e.g., a german keyboard layout,
"." on most others), gave emacs the key <kp-separator>.  With pgtk, this
is no longer the case.

This is a feature regression, because it no longer allows, for example,
remapping <kp-separator> to "." for `calc-digit-map`, so I can’t enter
decimal numbers using only the keypad.  As a workaround, I currently
have (define-key calc-digit-map (kbd ",") "."), but if I wanted to use
the vector feature of calc, I’d no longer have the comma.

Steps to reproduce:
> fictive-window-manager-control set-keyboard-map de
> # maybe some locale stuff, who knows
> ./configure --with-pgtk && make
> src/emacs -Q
> C-h k <kp-separator>

Expected output:
> , (translated from <kp-separator>) runs the command […]

Actual output:
> , runs the command […]

I traced this a bit.  In pgtkterm.c:key_press_event(),
pgtkim.c:pgtk_im_filter_keypress() is called, which essentially defers
to gtk_im_context_filter_keypress() from GTK.  From its
documentation[0]:

> Allow an input method to internally handle key press and release
> events.  If this function returns `TRUE`, then no further processing
> should be done for this key event.

Well, okay.  Unfortunately, I barely know enough GTK to get the gist of
what is happening here, by far not enough to fix this issue.

[0]: https://docs.gtk.org/gtk3/method.IMContext.filter_keypress.html


In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, cairo version 1.16.0)
 of 2022-06-11 built on localhost
Repository revision: 98365c7b1e1e1d3d5f7185f2d4a2baa1c65b4540
Repository branch: master
System Description: Gentoo Linux

Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --datarootdir=/usr/share
 --disable-silent-rules --docdir=/usr/share/doc/emacs-29.0.9999
 --htmldir=/usr/share/doc/emacs-29.0.9999/html --libdir=/usr/lib64
 --program-suffix=-emacs-29-vcs --includedir=/usr/include/emacs-29-vcs
 --infodir=/usr/share/info/emacs-29-vcs --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --without-compress-install --without-hesiod --without-pop
 --with-file-notification=inotify --with-pdumper --enable-acl
 --with-dbus --with-modules --with-gameuser=:gamestat --with-libgmp
 --with-gpm --with-native-compilation --with-json --with-kerberos
 --with-kerberos5 --with-lcms2 --with-xml2 --without-mailutils
 --without-selinux --without-sqlite3 --with-gnutls --with-libsystemd
 --with-threads --without-wide-int --with-zlib --with-sound=alsa
 --with-pgtk --without-x --without-ns --with-toolkit-scroll-bars
 --without-gconf --with-gsettings --with-harfbuzz --with-libotf
 --with-m17n-flt --with-xwidgets --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-webp --with-imagemagick
 --with-dumping=pdumper 'CFLAGS=-O2 -pipe -march=native -g'
 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND THREADS
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Important settings:
  value of $LC_MESSAGES: en_GB.UTF-8
  value of $LC_TIME: en_DK.UTF-8
  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: C/*l

Minor modes in effect:
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  helm-mode: t
  helm-minibuffer-history-mode: t
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  auto-encryption-mode: t
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  abbrev-mode: t

Load-path shadows:
/home/qsx/.emacs.d/elpa/dpkg-dev-el-20190824.2314/debian-autoloads hides /home/qsx/.emacs.d/elpa/debian-el-20211006.1939/debian-autoloads
/usr/share/emacs/site-lisp/cmake-mode hides /usr/share/emacs/site-lisp/cmake/cmake-mode
/usr/share/emacs/site-lisp/desktop-entry-mode hides /usr/share/emacs/site-lisp/desktop-file-utils/desktop-entry-mode
/home/qsx/.emacs.d/elpa/transient-20220527.2213/transient hides /usr/share/emacs/29.0.50/lisp/transient
/usr/share/emacs/site-lisp/mercury/gud hides /usr/share/emacs/29.0.50/lisp/progmodes/gud
/usr/share/emacs/site-lisp/mercurial/mercurial hides /home/qsx/.emacs.d/elisp/mercurial

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