[luatex] Strange hyphenation

[Khaled Hosny]

On Sun, Oct 03, 2010 at 06:15:03PM +0200, Paul Isambert wrote:
>  Le 03/10/2010 17:45, Taco Hoekwater a écrit :
> >On 10/03/2010 02:52 PM, enrico.gregorio at univr.it wrote:
> >>
> >>My fmtutil.cnf says
> >>
> >
> >Ok, I managed to fix my installation, and now I get the same bad
> >output you did (I had to run fmtutil --byfmt by hand to get a proper
> >new format).
> >
> >The problem is not the word 'determinante' at all. Believe it or not,
> >but the acutal problem is the '---' ligature. No _normal_ patterns are
> >applied to the current paragraph any more after the first occurence of
> >that. Hyphenation exceptions still work, and that is why the second
> >paragraph comes out ok.
> >
> >I need to do some serious thinking on why a ligature can block
> >hyphenation :(
> 
> Just for the record:
> 
> Enrico's text, under plain TeX, with luaotfload and an otf font, is
> hyphenated properly, even with `---' ligatures.
> So isn't it LaTeX, or Babel, or anything not related to LuaTeX, that
> is bugged?

Yes, because in that case it is no longer a TeX ligature, OpenType
ligatures (in "node" mode) are not done through the legacy TeX
ligaturing machinery.

-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer