On 6/17/2016 5:26 PM, Javier Bezos wrote:
I wrote:

I'll use pre_linebreak_filter then.

Unfortunately, it doesn't work either. If I need to change
the font for a short Arabic text, the isolated  forms are
used. After tracing what pre_linebreak_filter receives it's
clear at this point the contextual analysis has been already
done. How can I fix it?

push your callback function in front of the font handler .. but that kind of control is highly macro package dependent (so best consult mailing lists that relate to latex)

Hans


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