[tex-hyphen] handling combining accents in the hyphenation patterns

[Ulrike Fischer]

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 "при1"
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/