Correct computation of TeX class for maction elements (handle embellished operators correctly).
Correct computation of TeX class for maction elements (handle embellished operators correctly).

GerHobbelt/MathJax,GerHobbelt/MathJax,wikimedia/MathJax,thomasjm/MathJax,thomasjm/MathJax,jinntrance/mathjax,jinntrance/mathjax,thomasjm/MathJax,dpvc/MathJax,thomasjm/MathJax,thomasjm/MathJax