Candidate texts are rendered with white color in Qt-based mozc_renderer #1548

Description

mozc_renderer in Linux may be unexpectedly using the white color to render the candidate text. There is also a black borderline around the window, which is probably not intended as well.

Observed on Ubuntu 26.04 with Gnome, light-theme.

Steps to reproduce

1. bazelisk build package --config oss_linux --config release_build
2. unzip bazel-bin/unix/mozc.zip -d ~/mozc-bin
3. sudo rsync -a ~/mozc-bin/usr/ /usr/
4. ibus restart
5. Add Mozc an IBus input source. Then select Mozc as the current input source.
6. gnome-text-editor
7. Select Mozc. Type something.
8. Observe the candidate window (to be prescience, suggest window)

Expected behavior

Actual behavior

Version or commit-id

7f1973b

Environment

• OS: Ubuntu 26.06
• IMF: IBus 1.5.34-rc2
• Related Applications: Any