Fix incorrect positioning of root in mroot. (mathjax/MathJax#2347) #451
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The height of the root was not taking the correct depth into account (it used the depth of the surd character, but that is being shifted vertically, so doesn't correspond to the actual baseline). This required passing some more information to the functions that compute the information used in the bounding boxes, which accounts for most of the changes here.
Without this patch,
\sqrt[n]{\Rule{.5em}{.75em}{0em}}will have its root too low, while\sqrt[n]{\Rule{.5em}{0em}{1em}}will be too high.Resolves issue mathjax/MathJax#2347.