It may be a typographical problem, such line breaks are undesirable in
the Czech and Slovak typography. On the other hand, it is possible to
add \XeTeXdashbreakstate=0 to polyglossia for such languages so that
problems should not occur.
Indeed. Presumably this is long solved for 8-bit tex (and luatex, if
anyone cares about luatex and C/S).
My basic thought was, why should xetex be different in this regard from
the other engines? It seems philosophically wrong.
k
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