[Linux] fcitx5 input methods duplicate input on address bar

[Revival8697]

Description

fcitx5 input methods duplicate input on address bar. Tested with fcitx5-bamboo and fcitx5-unikey.

Steps to reproduce

1. Install and setup fcitx5.
2. Launch Brave with brave --incognito --ozone-platform=wayland --enable-wayland-ime --wayland-text-input-version=3.
3. Go to the address bar, switch input methods and type anything followed by a space.

Actual result

Words are duplicated:
https://github.com/user-attachments/assets/d5ec504e-5868-4ef0-a554-133853525f5e

Expected result

Words don't duplicate.

Reproduces how often

Easily reproduced

Brave version (brave://version info)

Brave: 1.77.101 Chromium: 135.0.7049.115 (Official Build) (64-bit)
Revision: 26bbcaf2303c02c94bd16823418eb1e83a00b86b
OS: Linux

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

Doesn't affect other text fields.
Not reproducible on Chromium 135.0.7049.114.

[Revival8697]

Workaround: Remove --wayland-text-input-version=3 and use only --enable-wayland-ime.

This issue is to be fixed upstream: Chromium Issue #40113488.

Extras:

• KDE Bug #492225
• Fcitx 5 on Wayland Support
• Wayland Text Input Protocols

[jiesou]

I use fcitx5 and kimpanel, under wayland (with input-v3 enabled), and set those environment variables through flatpak, and I also encounter this problem

This problem is so annoying that it has not been fixed yet.

[jiesou]

Using Chromium cannot reproduce this problem, so I think this problem is related to Brave.

[DawnMagnet]

I use fcitx5 and kimpanel, under wayland (with input-v3 enabled), and set those environment variables through flatpak, and I also encounter this problem

This problem is so annoying that it has not been fixed yet.

under my test with wayland and fcitx5 , the following flags will always have no duplicate input

brave --enable-features=UseOzonePlatform --ozone-platform=wayland --enable-wayland-ime

[jiesou]

I use fcitx5 and kimpanel, under wayland (with input-v3 enabled), and set those environment variables through flatpak, and I also encounter this problem
This problem is so annoying that it has not been fixed yet.

under my test with wayland and fcitx5 , the following flags will always have no duplicate input

brave --enable-features=UseOzonePlatform --ozone-platform=wayland --enable-wayland-ime

It doesn't work for me
If only set --enable-wayland-ime but don't enable wayland input v3, i can't use fcitx5 at all

Note that the current version of Chrome has enabled wayland input v3 in flags by default