Don't process escaped characters in a11y and menu extensions. mathjax/MathJax#2327. #438
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This PR adds an
isEscapedproperty toMathItemthat tells if it is an escaped character (e.g., produced by\$in the TeX input jax), and uses that to prevent processing of escaped content via the a11y extensions and the menu extension. Theassistive-mmlextension was causing errors by processing the escaped content.Resolves issue mathjax/MathJax#2327.