[lltx] Misplaced combined diacritics

[Yves Scherrer]

  Could there be another little bug in LuaLatex font handling?
Take the following example:

\documentclass{article}

\usepackage{fontspec}

\setmainfont{Gentium Basic}

\begin{document}

xa?x

\end{document}

When compiling with LuaLatex, the dots end up on top of the x, not on 
top of the a. The output is correct in XeLatex.

Note that the ä is produced (in the source code) from a + combining 
diaeresis. (In this particular case, I could of course just use the 
normal Umlaut character, but I have more complex cases where I need 
combining diacritics.)

Thanks,
Yves
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