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* 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>