[XeTeX] Problems with spacing in math formulae

[Vadim Radionov]

> I can reproduce it and while ago have seen it in a posted sample
> somewhere on the web. I don't know what is special about Euler's
> display summation to trigger such a bug (if it is actually a bug), text
> style summation is just fine.

In displaystyle, the sub- and superscripts are exactly on the same
places as in the textstyle (with \limits).

Vadim