[XeTeX] Font protrusion --- new or old ?

[Stephen Moye]

The only place this seems not to work is at the very beginning and the  
very end of paragraphs -- odd:

%%!TEX TS-program = xetex
\font\tenrm="Times New Roman" at 10pt
\tenrm

\XeTeXinterchartokenstate=1
\XeTeXcharclass "201C = 10
\XeTeXcharclass "201D = 11
\newdimen\quotehang
\XeTeXinterchartoks 255 10 = {{\XeTeXinterchartokenstate=0
     \setbox0=\hbox{\char"201C}\quotehang=\wd0
     \ifhmode\kern\quotehang\vadjust{}\else\leavevmode\fi
     \kern-\quotehang}}
\XeTeXinterchartoks 11 255 = {{\XeTeXinterchartokenstate=0
     \setbox0=\hbox{\char"201D}\quotehang=\wd0
     \kern-\quotehang\kern\quotehang}}

\hsize=3.25in
\parfillskip0pt

\noindent
“The one thing which I would note is that one can do this sort of thing
(to a certain degree) at the macro level — see Donald Knuth’s
description of “hanging punctuation” as “an easier problem” in The
\TeX{}book and Peter Wilson’s “hanging” package which enables this for
La\TeX\  and blah.”

\end

Stephen