Problems with spacing arround displayed \sum symbol

[chpech]

I do not know whether this is an issue of the font Neo Euler or whether it is related to the package unicode-math. The following is the problem: In a displayed formula like \sum_{i=1}^{n} The indices of the sum seem to touch the Sigma. Moreover, they do not stand (hang) centrally on (below) the Sigma.

I tried it with the non-unicode version of Euler, and there everything works. The problem is also visible in the test-file "test-1.ltx".

[khaledhosny]

This looks like a XeTeX issue, the following example shows file with lualatex, but not with xelatex:

\documentclass{article}

\usepackage{unicode-math}
\setmathfont[math-style=upright]{Neo Euler}

\begin{document}
\[
\sum_{i=1}^{n}
\]
\end{document}

Please report to unicode-math and/or xetex developers.