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I can't answer your main question (about hyphenation after an
apostrophe), but there are some points I can explain.<br>
<br>
<br>
Le 16/10/2010 11:47, Cyril Niklaus a écrit :<br>
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In making the small version I include here, I also noticed something surprising: the hyphenation changed depending on the length of the text I cut *after*. Leaving one sentence or two did not give the same results. Cutting immediately after the sentence gave the correct l'in-formation and l'infor-mation was what I got when cutting before De toute part.
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That's absolutely normal, that's even the reason why we use TeX :)<br>
TeX builds a paragraph as a whole; if you remove some words at the
end of your paragraph, it might change its entire shape.<br>
<br>
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I also noticed that including or not
\defaultfontfeatures{Mapping=tex-text}
changes things quite a bit while \frenchspacing did nothing obvious. I thought it would deal with spaces around the guillemets etc. but no. I'm wondering why I bothered including it. Is that a benefit from polyglossia?
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\frenchspacing has nothing to with polyglossia, and it <i>is</i>
extremely important, even though you might not notice at once. It's
a macro inherited from plain TeX, whose effect is to disable extra
space after strong punctuation marks (e.g. a period), which extra
space is used in (some flavors of) English typography. So keep it,
although indeed it doesn't deal with space around guillemets.<br>
<br>
Best,<br>
Paul<br>
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