From news3 at nililand.de  Mon Nov 21 14:38:28 2016
From: news3 at nililand.de (Ulrike Fischer)
Date: Mon, 21 Nov 2016 14:38:28 +0100
Subject: [tex-hyphen] handling combining accents in the hyphenation patterns
Message-ID: <1jxa5gdznqpbu$.dlg@nililand.de>

On tex.sx there was a question about an hyphenation break before an
combining accent
https://tex.stackexchange.com/questions/339242/avoid-hyphenation-before-combining-accents


I looked a bit at it and imho the problem is related to some
existing patterns. In the russian case the patterns contains "???1"
and this has the side effect to separate a following combining
accent from the vowel. 

Something similar can be demonstrated with the german pattern. They
contain "ata1" and "athe1" and trying it out with a combining accent
shows the same problem:

\documentclass[]{article}
\usepackage[ngerman]{babel}
\usepackage{fontspec}
\setmainfont{Linux Libertine O}
\textwidth=1mm
\parindent=0pt
\begin{document}
x ata^^^^0308nasius

y athe^^^^0301neum
\end{document}


Wouldn't it be senseful to add in all languages patterns that
suppress the hyphenation before all combining accents (for lualatex
+ xelatex)? 

-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/


From arthur.reutenauer at normalesup.org  Mon Nov 21 14:56:45 2016
From: arthur.reutenauer at normalesup.org (Arthur Reutenauer)
Date: Mon, 21 Nov 2016 14:56:45 +0100
Subject: [tex-hyphen] handling combining accents in the hyphenation
 patterns
In-Reply-To: <1jxa5gdznqpbu$.dlg@nililand.de>
References: <1jxa5gdznqpbu$.dlg@nililand.de>
Message-ID: <20161121135645.GV3755204@phare.normalesup.org>

> Wouldn't it be senseful to add in all languages patterns that
> suppress the hyphenation before all combining accents (for lualatex
> + xelatex)? 

  I?ve already considered it since we had a very similar report a couple
of months ago, also about Russian.  I think it makes sense and I?ve just
created an issue on the GitHub tracker to keep track of that
(https://github.com/hyphenation/tex-hyphen/issues/5).

  Thanks for the report.

	Best,

		Arthur