> No, \XeTeXinputnormalization is not what I am looking for. In my
> example, Greek language, alpha and combining acute are there just for
> the sake of simplicity. In the real material, I have more complex
> pairs that certainly do not have precomposed variants.
You should use XeTeX interchar token mechanism:
\XeTeXinterchartokenstate=1
\newXeTeXintercharclass\combiningchar
\XeTeXcharclass"0301=\combiningchar
\XeTeXinterchartoks 0 \combiningchar = {\penalty10000}
This works as expected on my machine.
Explanations later, gotta go.
Arthkr
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