bug#65068: 29.1; xkb-interception interaction causes problems with key combinations

[Alexander Prähauser]

I'm using the interception-`dual-function-keys`-plugin

https://gitlab.com/interception/linux/plugins/dual-function-keys

for my keyboard layout. In version 28.2 it worked perfectly, but
now, if I try to use combinations using keys that have
a dual function, the combination breaks off sending the wrong
signals. For instance, my CapsLock key has a dual function,
sending a F15 (XF86Launch5) if tapped and acting as the
apostrophe-key (AC11 in xkb) if held, which is configured in xkb
to act as an xkb level 3 modifier. However, now when I try to use
CapsLock for a key combination using a level 3 symbol, for
instance if I hold Control, then press CapsLock, it seems to send
simply the apostrophe-key, so that I receive the
message "C-' is undefined" and the key sequence is broken off. If
I continue to hold both Control and CapsLock, it seems
to access level 3 normally though, so that I can still use
combinations consisting of C-[level 3 character]. If I only want
to access a level 3 symbol by holding CapsLock, it works normally,
it seems
only combinations are affected. While typing this message I
noticed an even weirder thing: my F-key is configured to
have "a" on level and "Right" on level 5, and Rightalt is
configured to act as a level 5 modifier if held, and if I
press the F key normally or while holding Rightalt this works, but
if I first hold Control, then Rightalt, then tap the
F-key, it seems to interpret the result as C-f, even though on no
xkb-level the F-key is configured to actually send f.

The problem persists if I instead build the latest Emacs-version
(30.1) from Github, but vanishes if I downgrade to
28.2. It also persists if I start Emacs without loading the init
file.



In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.38, cairo version 1.17.8)
Windowing system distributor 'The X.Org Foundation', version
11.0.12301002
System Description: Arch Linux

Configured using:
'configure --sysconfdir=/etc --prefix=/usr --libexecdir=/usr/lib
--with-tree-sitter --localstatedir=/var --with-cairo
--disable-build-details --with-harfbuzz --with-libsystemd
--with-modules --with-x-toolkit=gtk3 'CFLAGS=-march=x86-64
-mtune=generic -O2 -pipe -fno-plt -fexceptions
-Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
-fstack-clash-protection -fcf-protection -g
-ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs
-flto=auto'
'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now
-flto=auto''
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
JPEG JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT
MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE
XIM XINPUT2 XPM GTK3 ZLIB
Important settings:
 value of $LANG: en_US.UTF-8
 locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
 winner-mode: t
 mu4easy-mode: t
 org-msg-mode: t
 mu4e-column-faces-mode: t
 mu4e-modeline-mode: t
 global-edit-server-edit-mode: t
 helm-epa-mode: t
 helm-top-poll-mode: t
 helm-adaptive-mode: t
 recentf-mode: t
 windmove-mode: t
 backward-forward-mode: t
 dynamic-completion-mode: t
 global-display-line-numbers-mode: t
 display-line-numbers-mode: t
 electric-pair-mode: t
 yas-global-mode: t
 yas-minor-mode: t
 helm-mode: t
 helm-minibuffer-history-mode: t
 helm-ff-icon-mode: t
 shell-dirtrack-mode: t
 helm-popup-tip-mode: t
 TeX-PDF-mode: t
 global-auto-complete-mode: t
 auto-complete-mode: t
 savehist-mode: t
 projectile-mode: t
 minibuffer-depth-indicate-mode: t
 icicle-mode: t
 Info-breadcrumbs-in-mode-line-mode: t
 global-undo-tree-mode: t
 async-bytecomp-package-mode: t
 override-global-mode: t
 desktop-save-mode: t
 tooltip-mode: t
 global-eldoc-mode: t
 eldoc-mode: t
 show-paren-mode: t
 electric-indent-mode: t
 mouse-wheel-mode: t
 global-prettify-symbols-mode: t
 prettify-symbols-mode: t
 file-name-shadow-mode: t
 global-font-lock-mode: t
 font-lock-mode: t
 blink-cursor-mode: t
 line-number-mode: t
 global-visual-line-mode: t
 visual-line-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:
~/.emacs.d/site-lisp/icicles/dired+ hides
~/.emacs.d/site-lisp/dired+
~/.emacs.d/site-lisp/icicles/bookmark+ hides
/home/alex/.emacs.d/elpa/bookmark+-20230325.160624/bookmark+
/home/alex/.emacs.d/elpa/transient-20230723.1411/transient hides
/usr/share/emacs/29.1/lisp/transient
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package
hides /usr/share/emacs/29.1/lisp/use-package/use-package
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package-lint
hides /usr/share/emacs/29.1/lisp/use-package/use-package-lint
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package-jump
hides /usr/share/emacs/29.1/lisp/use-package/use-package-jump
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package-ensure
hides /usr/share/emacs/29.1/lisp/use-package/use-package-ensure
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package-diminish
hides /usr/share/emacs/29.1/lisp/use-package/use-package-diminish
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package-delight
hides /usr/share/emacs/29.1/lisp/use-package/use-package-delight
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package-core
hides /usr/share/emacs/29.1/lisp/use-package/use-package-core
/home/alex/.emacs.d/elpa/use-package-20230426.2324/use-package-bind-key
hides /usr/share/emacs/29.1/lisp/use-package/use-package-bind-key
/home/alex/.emacs.d/elpa/bind-key-20230203.2004/bind-key hides
/usr/share/emacs/29.1/lisp/use-package/bind-key

Features:
(shadow view emacsbug winner face-remap tramp-archive tramp-gvfs
tramp-cache time-stamp zeroconf helm-command helm-elisp
helm-eval edebug debug backtrace mu4easy org-msg htmlize gnus-msg
gnus-cite helm-mu mu4e-alert time ht dash s alert
log4e gntp mu4e-column-faces inline mu4e-contrib eshell esh-cmd
esh-ext esh-opt esh-proc esh-io esh-arg esh-module
esh-groups esh-util mu4e-icalendar gnus-icalendar org-capture
icalendar diary-lib diary-loaddefs mu4e mu4e-org
mu4e-notification notifications mu4e-main mu4e-view gnus-art mm-uu
mml2015 mm-view mml-smime smime gnutls dig gnus-sum
gnus-group gnus-undo gnus-start gnus-dbus gnus-cloud nnimap nnmail
mail-source utf7 nnoo gnus-spec gnus-int gnus-range
gnus-win gnus nnheader range mu4e-headers mu4e-compose mu4e-draft
mu4e-actions smtpmail mu4e-search mu4e-lists
mu4e-bookmarks mu4e-mark mu4e-message shr pixel-fill kinsoku
url-file svg dom flow-fill mule-util mu4e-contacts
mu4e-update mu4e-folders mu4e-context mu4e-query-items mu4e-server
mu4e-modeline mu4e-vars mu4e-helpers mu4e-config
mu4e-window ido message sendmail yank-media puny rfc822 mml
mml-sec gnus-util mailabbrev mail-utils gmm-utils mailheader
mu4e-obsolete edit-server finder-inf init-helm helm-epa
all-the-icons all-the-icons-faces data-material
data-weathericons data-octicons data-fileicons data-faicons
data-alltheicons helm-sys helm-adaptive isearch+
isearch-prop color recentf tree-widget windmove epa-file
backward-forward completion display-line-numbers elec-pair
wc-mode quelpa-use-package quelpa mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums
mail-prsvr yasnippet-snippets yasnippet cdlatex reftex
reftex-loaddefs reftex-vars cl-extra helm-dired-history helm-mode
helm-misc helm-files tramp tramp-loaddefs trampver
tramp-integration files-x tramp-compat shell parse-time iso8601
helm-buffers helm-occur helm-tags helm-locate helm-grep
helm-regexp helm-utils helm-help helm-types auto-install
auto-complete-auctex latex latex-flymake flymake-proc flymake
warnings tex-ispell tex-style tex dbus xml crm texmathp
ac-math math-symbol-lists auto-complete-config auto-complete popup
epa epg rfc6068 epg-config yaml-mode auto-dictionary
flyspell-correct-helm flyspell-correct flyspell ispell gnus-dired
dired-quick-sort hydra lv savehist ls-lisp projectile
project lisp-mnt grep compile ibuf-ext mb-depth facemenu
two-column ibuffer ibuffer-loaddefs icicles icicles-mode dired+
image-file image-converter dired-aux icicles-cmd2 icicles-cmd1
icicles-mcmd image-dired image-dired-tags
image-dired-external image-dired-util doremi icicles-fn
icicles-var apropos-fn+var apropos icicles-opt ffap- ffap
fuzzy-match cus-theme cus-edit cus-load menu-bar+ misc-cmds rect
bookmark+ bookmark+-key bookmark+-bmu info+ fit-frame
help-fns+ wid-edit+ help-fns radix-tree bookmark+-lit pp+
help-mode derived crosshairs col-highlight vline hl-line+
hl-line bookmark+-1 bookmark+-mac bookmark text-property-search pp
thingatpt+ thingatpt icicles-face hexrgb mime-w3m w3m
doc-view filenotify jka-compr image-mode exif timezone w3m-hist
bookmark-w3m w3m-ems wid-edit w3m-favicon w3m-image
w3m-fb tab-line w3m-proc w3m-util dired-x dired dired-loaddefs
ox-odt rng-loc rng-uri rng-parse rng-match rng-dt
rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util
ox-latex ox-icalendar org-agenda ox-html table ox-ascii
ox-publish ox org-element org-persist xdg org-id org-refile org ob
ob-tangle ob-ref ob-lob ob-table org-macro org-src
ob-comint org-pcomplete pcomplete comint ansi-osc ansi-color
org-list org-footnote org-faces org-entities time-date
noutline outline icons ob-emacs-lisp org-table org-keys
org-loaddefs find-func cal-menu calendar cal-loaddefs avl-tree
generator ol oc ob-exp ob-core org-cycle org-fold org-fold-core
org-compat ob-eval org-version org-macs format-spec
ace-jump-mode advice undo-tree diff queue helm
helm-global-bindings edmacro kmacro helm-info ring helm-core
async-bytecomp helm-source helm-multi-match helm-lib async
use-package use-package-ensure use-package-delight
use-package-diminish use-package-bind-key bind-key easy-mmode
use-package-core desktop frameset icicles-install cl
modus-vivendi-theme modus-themes ac-math-autoloads tex-site
auto-complete-auctex-autoloads auto-complete-sage-autoloads
auto-complete-autoloads auto-dictionary-autoloads
math-symbol-lists-autoloads helm-easymenu rx pcase w3m-load info
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 url-vars cl-loaddefs cl-lib 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 lcms2
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 1084888 70575)
(symbols 48 64992 2)
(strings 32 309699 10624)
(string-bytes 1 9054677)
(vectors 16 104759)
(vector-slots 8 1305888 62372)
(floats 8 1013 357)
(intervals 56 1703 365)
(buffers 984 20))