Improve heuristics for adding function-apply following operators.  Issue #1312.
Improve heuristics for adding function-apply following operators.  Issue #1312.

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