Better measuring of text that is in a native font rather than MathJax fonts #1014
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This PR fixes a problem with determining the width of text that is in a system font rather than in the MathJax fonts. These come from
\text{}thenmtextInheritFontis true, or from error messages (whenmerrorInheritFontis true, which it is by default), or from characters that aren't in the MathJax fonts, like Chinese characters, or when afont-familyis specified in a\style{}command or MathMLstyleattribute.You can't test this in the lab, as the issue only occurs when the math is typeset outside the DOM via
MathJax.tex2chtml()or one of the other conversion functions, and then inserted into a container with afont-sizethat is other than 100%.