Fully clear tagging on equation start. (mathjax/MathJax#2643) #630
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This PR resolves an issue where the tagging information was not fully cleared when an equation begins. This caused a problem if there were TagInfo objects on the stack when an extension is autoloaded (causing the equation to be rerendered). The extra TagInfo would end up setting the initial
currentTag
item when the next equation is processed. See the example at mathjax/MathJax#2643.