> Date: Sat, 1 Jul 2017 16:36:52 +0300 > From: Itai Berli via Unicode <unicode@unicode.org> > > Emacs claims to fully conform to the Unicode Bidirectional Algorithm > 8.0.0 (see sections 22.19 'Bidirectional Editing' and 37.26 > 'Bidirectional Display' of the Emacs manual)
This is somewhat inaccurate. For the record, the actual text of section 22.19 if the Emacs User manual is: Emacs implements the Unicode Bidirectional Algorithm described in the Unicode Standard Annex #9, for reordering of bidirectional text for display. The actual text of section 37.26 of the Emacs Lisp Reference manual is: In performing this “bidirectional reordering”, Emacs follows the Unicode Bidirectional Algorithm (a.k.a. UBA), which is described in Annex #9 of the Unicode standard (<http://www.unicode.org/reports/tr9/>). Emacs provides a “Full Bidirectionality” class implementation of the UBA, consistent with the requirements of the Unicode Standard v8.0. The "Full Bidirectionality class" part refers to section 4.2 of UAX#9, and specifically to the fact that all of the explicit directional formatting characters are supported, including the isolates.