\overline does not cope well with text-style limits on operators

Created by: EmilJ

$\overline{\lim_{n\to\infty}}$ or $\overline{\sum_{n=0}^N}$ are rendered with a short line in a superscript position after the main expression instead of an overline. (Yes, I know about \varlimsup, that’s not the point.) The bug seems to affect only named operators with \nolimits-style subscripts or superscripts, but without an explicit \nolimits declaration. The following all render corerctly: $\overline{\lim}$, $$\overline{\lim_{n\to\infty}}$$, $\overline{\lim\limits_{n\to\infty}}$, $\overline{\lim\nolimits_{n\to\infty}}$, $\overline{\operatorname{lim}_{n\to\infty}}$, $\overline{X_{n\to\infty}}$, $\overline{\int_n}$.

I’ve been testing it with the HTML–CSS output of MathJax versions 2.2 and 2.0, using local TeX fonts, in Firefox 14.0.1 and Opera 11.61 on Linux.