LuaTeX + microtype: Small Caps vs. Letter Spacing

["N. Lindenhayn" <mehl@lindenhayn.com>]

Hi everyone,

I'm happy to see that by now almost all of microtype's features are 
available in Lua, almost like in the old days. There's one thing that 
seems a bit strange, though:

While I have no trouble applying letter spacing using \textls or 
\lsstyle to regular, italic, or bold text, I can't get it to work on 
small caps. What's even stranger: while this problem occurs with all 
fonts I've tried, it does /not/ occur when I don't specify a font at 
all. Consider the example below. The only way to get the correct output, 
with spaced small caps, is to deactivate the \setmainfont line -- which 
obviously isn't what you'd want :)

Any hints are appreciated; chances are I just have to add a thing here 
or there.

best
Nils.

\documentclass{scrartcl}
\usepackage{fontspec,microtype}
\setmainfont{Minion Pro}%or TeX Gyre Termes, or Latin Modern Roman...
\begin{document}
stealing sheep\par
\textls{stealing sheep}\par
\textsc{stealing sheep}\par
\textls{\textit{stealing sheep}}\par
\textls{\textbf{stealing sheep}}\par
\textls{\textsc{stealing sheep}}
\end{document}
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