[XeTeX] Discretionary line-breaks in Tamil

[Ulrike Fischer]

Am Sun, 29 Sep 2019 19:26:37 +0900 schrieb Yannis Haralambous:

>> that discretionary. Better solution would be to redefine \hyphenchar
>> of the font as an invisible character with a sero width. I am not sure
> 
> Beware that the glyph must exist in the font, you cannot just use an arbitrary
> unoccupied glyph position in the font.

Doesn't seem to be the case:

This here breaks at the 200B without problem, despite the fact that
latin modern hasn't it (there is a missing glyph message in the
log):

\documentclass{article}
\textwidth=1mm
\begin{document}
\hyphenchar\font="200B

a aa^^^^200baa

a
aaaa
\end{document}

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