* fix(arm64-linux): fix CJK font rendering on flutter-elinux
The flutter-elinux engine used for ARM64 Linux builds is compiled without
--enable-fontconfig, so Flutter's text shaper cannot discover system fonts.
This causes CJK characters to render as tofu boxes even when fonts such as
Noto Sans CJK are installed. See flutter/flutter#139293.
Fix by loading a CJK font at startup via FontLoader (bypassing fontconfig)
and propagating it through two paths so all text widgets are covered:
1. MyTheme.applyFontFallback() — updates textTheme on both light and dark
ThemeData so Material components receive the fallback through the theme.
2. _mergeCjkFallback() in GetMaterialApp builders — wraps child widgets in
DefaultTextStyle.merge so bare Text() widgets and those with inherit:true
also render CJK characters correctly.
Font discovery queries fc-list for zh, ja, and ko separately, preferring
fonts present in all three sets (true pan-CJK fonts such as NotoSansCJK or
SourceHanSans) over Chinese-only fonts that may lack Japanese kana or Korean
hangul glyphs. Falls back to a hardcoded search-path list covering
Debian/Ubuntu, Fedora/RHEL, Arch Linux, and WenQuanYi font layouts.
This is an app-level workaround. The engine-level fix is tracked at
flutter/flutter#180235 (open as of 2026-06).
Fixes#10666
Signed-off-by: Bia503 <yinwenche189@gmail.com>
* Potential fix for pull request finding
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
---------
Signed-off-by: Bia503 <yinwenche189@gmail.com>
Co-authored-by: RustDesk <71636191+rustdesk@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
