For some time now I have been partially aware of some oddities in the XeTeX
implementation of :letterspace, but it was only today that my thoughts
crystallised sufficiently for me to attempt to record them on- list :
1) Search functionality.
For :
\font \errorfont = "Copperplate Gothic Bold:letterspace=8,color=BF0000" scaled
2260
\newbox \errorbox
\setbox \errorbox = \leftline {\errorfont +++ NOT AT TOP OF PAGE +++}
Adobe Acrobat 7.1 has no problem locating the string "+++" if the contents of
\errorbox end up in the PDF file; however, for
\font \errorfont = "Copperplate Gothic Bold:letterspace=16,color=BF0000" scaled
2260
the same string cannot be found.
2) \fontdimen 2 is not affected by the :letterspace parameter; arguably it
should be, such that interword space is stretched in proportion to interletter
space (and perhaps \fontdimens 3, 4 & 7 should be modified as well, and perhaps
even 6).
--
Philip Taylor
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