[XeTeX] XeTeX \magnification issues

[Pierre Vanhove]

Hello

When typsetting a document with XeTeX  and using a \magnification  
such as \magstep1 or higher, the position of the letters of the words  
are positionned correctly.
The problem does not occur with XeLaTeX.

Why is this happening and how can this be fixed?

Thank you, Pierre

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\magnification=\magstep1

\font\zapfino="Zapfino:Stylistic Variants=Second variant glyph set"

\zapfino The letters of this text are too compressed

\bye

The log file is the following

This is XeTeX, Version 3.141592-2.2-0.995 (Web2C 7.5.5) (format=xetex  
2006.9.4)
4 SEP 2006 09:58
entering extended mode
**test-fontes
(./test-fontes.tex

Output written on test-fontes.pdf (1 page).