Hi,
a microtype user has stumbled upon a problem with \letterspacefont in
combination with font expansion[1]: In lines with full (positive or
negative) expansion, luatex always uses the normal font instead of the
letterspaced instance. This happens regardless whether the letterspaced
font is itself expanded. It is ok in lines which are only partially
expanded.
\pdfadjustspacing2
\pdffontexpand\font 20 20 2 autoexpand
\letterspacefont\lsfont\font 200
%\pdffontexpand\lsfont 20 20 2 autoexpand
\spaceskip1ex
\tracingoutput1
\showboxbreadth1000
\hsize162pt % expansion = -18
testing {\lsfont letter space} testing testing testing
\hsize161pt % expansion = -20
testing {\lsfont letter space} testing testing testing
\parfillskip0pt % expansion = +20
testing {\lsfont letter space}
\bye
Thanks,
--
Robert
[1] MID: <[email protected]>
