GNU bug report logs - #27525
25.1; Line wrapping of bidi paragraphs

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Message #17 received at 27525 <at> debbugs.gnu.org (full text, mbox):

From: Itai Berli <itai.berli <at> gmail.com>
To: 27525 <at> debbugs.gnu.org
Subject: Re: 25.1; Line wrapping of bidi paragraphs
Date: Tue, 4 Jul 2017 12:11:05 +0300

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I obviously didn't end up replacing the bullet points by numbers...

On Tue, Jul 4, 2017 at 12:10 PM, Itai Berli <itai.berli <at> gmail.com> wrote:

> 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).
>
> The reason is that section 3.4 'Reordering Resolved Levels' of the
> algorithm states (I replaced the bullet points in the original by numbers):
>
> > * The characters are shaped into glyphs [...]
> *> * *The accumulated widths of those glyphs *(in logical order)* are
> used to determine line breaks.
>
> The Emacs line-wrapping algorithm does not use the logical order of the
> glyphs to determine line breaks, as evidence by the example given in my
> original post, which I shall link to again: http://imgur.com/Bckn7zP
>

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