- Use pgtk feature branch GNU Emacs

- Use a keyboard layout that utilizes ISO_Level5_Shift (e.g. neoqwertz, bone, …)

- Launch with `emacs -Q`

- Try to use ISO_Level5_Shift to access arrow keys or other shifted key

- `H-<down> is undefined` appears in echo area instead of sending down

arrow and invoking `next-line` (This works in GNU Emacs without pgtk)

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.27, cairo version 1.16.0)

Repository revision: 8b51761dfda1c85c1e0b2344b005bb435117937a

Repository branch: master

Windowing system distributor 'System Description: NixOS 21.05 (Okapi)

Configured using:

'configure

--prefix=/nix/store/nkq5x0gbzjalnq7xq78abfsaxfg00yx7-emacs-pgtkgcc-20210425.0

--disable-build-details --with-modules --with-x-toolkit=gtk3

--with-cairo --with-native-compilation --with-pgtk'

Configured features:

CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON

LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY

PDUMPER PGTK PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS XIM

GTK3 ZLIB

Important settings:

value of $LC_CTYPE: zh_CN.UTF-8

value of $LC_TIME: en_DK.UTF-8

value of $LANG: en_US.UTF-8

locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:

tooltip-mode: t

global-eldoc-mode: t

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

font-lock-mode: t

blink-cursor-mode: t

auto-composition-mode: t

auto-encryption-mode: t

auto-compression-mode: t

line-number-mode: t

transient-mark-mode: t

Load-path shadows:

None found.

Features:

(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs

rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail

rmail-loaddefs auth-source cl-seq eieio eieio-core cl-macs

eieio-loaddefs password-cache json map text-property-search time-date

subr-x seq byte-opt gv bytecomp byte-compile cconv 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

china-util iso-transl tooltip eldoc electric uniquify ediff-hook

vc-hooks lisp-float-type mwheel term/pgtk-win pgtk-win term/common-win

tool-bar dnd fontset image regexp-opt fringe tabulated-list replace

newcomment text-mode elisp-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 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

composite charscript charprop case-table epa-hook jka-cmpr-hook help

simple abbrev obarray cl-preloaded nadvice button loaddefs faces

cus-face macroexp files window text-properties overlay sha1 md5 base64

format env code-pages mule custom widget hashtable-print-readable

backquote threads dbusbind inotify dynamic-setting system-font-setting

font-render-setting cairo move-toolbar gtk x-toolkit pgtk multi-tty

make-network-process nativecomp emacs)

Memory information:

((conses 16 67501 7027)

(symbols 48 6638 0)

(strings 32 19211 1528)

(string-bytes 1 687662)

(vectors 16 13850)

(vector-slots 8 339430 10291)

(floats 8 22 31)

(intervals 56 205 0)

(buffers 992 10))