https://bugs.kde.org/show_bug.cgi?id=476353
Bug ID: 476353
Summary: Trigger keyboard layout switch shortcuts on release,
not press
Classification: Plasma
Product: kwin
Version: 5.27.8
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: input
Assignee: kwin-bugs-n...@kde.org
Reporter: xalt7x.serv...@gmail.com
Target Milestone: ---
SUMMARY
Nowadays many application shortcuts involve Ctrl+Shift and Alt+Shift
combinations. On Linux desktops some shortcuts for keyboard layout switching
conflict with them. For example, if a user binds "Ctrl+Shift" for keyboard
layout switching, combinations like Ctrl+Shift+C (paste into terminal emulator)
or Ctrl+Shift+Z (Redo action) wouldn't work as "Shift" will be used for
keyboard layout switching. It's an infamous X11 XCB issue that gets inherited
on Wayland. All previous bug reports suggested changing XCB behavior to trigger
a keyboard layout switching on hotkeys release rather than on press. An
unofficial patch for X11 still exists but it doesn't work for Wayland.
STEPS TO REPRODUCE
1. Open "System Settings" > "Keyboard" > "Layouts" > "Shortcuts for Switching
Layout" > "Main Shortcuts"
2. Select Ctrl+Shift option for "Switching to another layout"
3. Copy some terminal command (.e.g., echo 1) to your clipboard
4. Open a terminal emulator (e.g. Konsole)
5. Press Ctrl+Shift+V
OBSERVED RESULT
The command gets pasted to the Konsole
EXPECTED RESULT
The command doesn't get pasted to the Konsole
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 39 Kinoite
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
ADDITIONAL INFORMATION
This issue is important mostly because this old XCB provides bad UX:
1. For users who are comfortable with those classic ("Windows") combinations
2. For users that are not aware of this issue. Some programs expose these XCB
options (e.g. KDE System Settings, GNOME Tweaks), and some installers (e.g.
Fedora Anakonda or Debian installer) might even select Alt+Shift by default for
non-English locales. No one warns about potential issues. As a result, users
receive broken shortcuts (e.g. Alt+Shift+Tab) until they somehow find a way to
fix it.
There was the same bug for KWin X11 and as the XCB bug won't be fixed, KDE
maintainers suggested opening another bug.
Related topics:
https://bugs.kde.org/show_bug.cgi?id=453506
https://bugs.freedesktop.org/show_bug.cgi?id=865
https://gitlab.freedesktop.org/xorg/xserver/-/issues/258
https://aur.archlinux.org/packages/xorg-server-bug865
https://gitlab.freedesktop.org/wayland/weston/-/issues/207
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