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bug#27525: 25.1; Line wrapping of bidi paragraphs


From: Eli Zaretskii
Subject: bug#27525: 25.1; Line wrapping of bidi paragraphs
Date: Tue, 04 Jul 2017 17:40:07 +0300

> From: Itai Berli <address@hidden>
> Date: Tue, 4 Jul 2017 12:10:17 +0300
> 
> I'd like to add that this behavior breaks the Unicode bidirectional algorithm 
> (UBA), and hence invalidates
> Emacs' claim of full conformance, or indeed of weak conformance, for that 
> matter (so-called 'implicit
> bidirectionality' -- see section 4.2 of the UBA specifications).

Yes, line wrapping when text direction is opposite to the paragraph
direction is where Emacs deviates from the UBA.  I've added this
caveat to the Emacs manuals a few days ago.

The "full conformance" part refers to the fact that all the explicit
directional controls are supported, including the isolates.





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