[moal]

Actually FLTK has full unicode support, right-to-left and bidi text. The limiting factor is the OS. For rtl and bidi, it depends on the OS. On linux for example, if FLTK is built with pango support, it'll support them just fine. On windows and macos, these work out of the box. As for accessibility, the only thing missing is screen reader support. Otherwise tab navigation, ime and other modalities are supported. FLTK's bindings in Rust provide an accesskit adapter which supports screen readers using the accesskit crate.