This is the best I can do. If 11.4 doesn't provide a new enough fribidi there is nothing I can do... It's not an optional feature. We need to test the latest libass in Factory even if it is not available in 11.4.
I suggest a "osc copypac -r <last revision that builds> multimedia:libs libass multimedia:libs libass-pre121" or linking the latest fribidi in multimedia:libs.

- Update to version 0.10.0
  + Bidirectional layout and Arabic shaping via FriBidi (GC #13)
  + Add API for shaper configuration
  + Add support for `Language' Script Info property, this can be
    used for hinting the text language
  + Vertical layout improvements
    * Use `vert' and `vkna' OpenType features for vertical glyph
      variants
    * Position rotated glyphs onto baseline
  + Parse font encoding property for base text direction hinting
  + Refactor cache system
  + Use generic outlines in place of FreeType glyphs
  + Direct outline bitmap rendering
  + Fix whitespace trimming (GC #35)
  + Do not render border if there's no shadow or glyph (GC #29)
  + Adjust spacing after a italic to non-italic style change (GC #37)
  + Fix fade timing
  + Fix x positioning with borders (GC #27)
- Use pkgconfig() BuildRequires
- Parameterize the soname number (forwarded request 89752 from RedDwarf)

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