https://bugs.kde.org/show_bug.cgi?id=506095
Bug ID: 506095
Summary: Input Method Occasionally Breaks in X11 Applications
in Wayland Session
Classification: Plasma
Product: kwin
Version First 6.4.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: xwayland
Assignee: kwin-bugs-n...@kde.org
Reporter: einbert-xer...@outlook.com
Target Milestone: ---
SUMMARY
Input method (in my case fcitx5) occasionally fails to follow cursor or submit
anything to the input widget, when using an X11 application in a Wayland
session.
STEPS TO REPRODUCE
1. Use an X11 application (like Google Chrome) under Wayland session for enough
long time, switching input method on and off when using it.
This is not a reliable reproduce method, yet I have not found any reliable way
of triggering such bug.
OBSERVED RESULT
Input method sometimes failed to work in that X11 application. When it failed
to work:
- The IME prompt ([en] or [拼] or [あ (Hiragana)]) appears at the left-top corner
of the screen.
- When typing anything, the candidate prompt also appears at the same left-top
corner.
- Submitting any word by pressing space or num key doesn't actually submit
anything, even if you're focusing in an input-aware widget (like a <textarea>
element).
- Toggling input method back and forth may or may not solve this issue
temporarily.
- Toggling input method in a Wayland window and going back to the X11 window,
may or may not solve this issue temporarily.
- Toggling IME in Wayland combining with cycling through installed IMEs (EN →
ZH → JP → EN), may or may not solve this issue temporarily.
- Sometimes when cycling through IMEs when it's broken, a different IME prompt
may appear following cursor alongside with the broken one at the left-top
corner (e.g. [拼] following cursor with [en] at left-top corner).
- Any attempt of solving this issue by toggling and cycling through IMEs may
break other mitigations that once worked, sometimes including itself.
- When it breaks, it breaks for all X11 applications.
- Wayland applications appear to be not affected.
EXPECTED RESULT
Input method should work as usual.
SOFTWARE/OS VERSIONS
Linux: Arch Linux 6.15.3-arch1-1
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
ADDITIONAL INFORMATION
This could be a Chromium related bug. The only X11 applications I use with IME
are Google Chrome and Lark (uses CEF internally).
This appears to be an IME status desync bug between a Wayland session and the
XWayland server running inside it.
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