On 2016-02-12 at 21:32:40 +0700, Igor Liferenko wrote:
> Can anybody explain why and how luatex hyphenates on ligatures? Is
> this incompatibility with TeX intentional, or is it just a bug
> which has not been fixed?
I don't think that it's deprecated to hyphenate at ligatures in
general. This heavily depends on the language and maybe other
constraints.
A problem is that TeX doesn't know when a ligature is appropriate
or not. At least in German, ligatures are deprecated at boundaries of
composed words.
Consider the German word Auflage. The fl-ligature is deprecated and
LaTeX users write
\usepackage[german]{babel}
....
Auf"|lage
in order to avoid the ligature. Nevertheless, Auf-lage is a good
hyphenation point despite the ligature, even if it wasn't disabled
manually.
On the other hand I suppose that the Dutch ij-ligature shall never be
hyphenated. But with proper hyphenation patterns it won't happen
anyway.
Regards,
Reinhard
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