[XeTeX] line spacing

[Yves Codet]

Hello.

When I use "Zapfino" to typeset a text I get, for each page, a warning 
about an overfull or underfull vertical box. I guess it's because the 
space between two lines is a little too large.

I tried:
	\renewcommand\baselinestretch{xxx}
with different values. It doesn't seem to do anything.

Is this command overridden by "fontspec" and is there a "fontspec" way 
to choose a spacing?

I attach a short sample which shows that small problem.

Kind regards,

Yves

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