Fix menu to not rerender if no typesetting has occurred. (mathjax/MathJax#3167) #1044
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If the MathJax configuration includes
startup {typeset: false}and also has menu settings that require loading extensions (e.g., if assistive-mml is on) or the user has set the menu so that something needs to be loaded (e.g., the renderer has been changed in the contextual menu), then the math will be typeset despite thetypeset: falsesetting (because the Menu code will think a pre-render is necessary because of the menu settings).This PR adds a
rerenderPromiseto thets/components/startup.tsfile that is initiallynull(meaning no typesetting has occurred), and is set to theMathJax.startup.promiseonce typesetting has been requested. That lets the menu code determine if a re-render is needed (i.e., typesetting has already occurred), and gives it a promise to use to queue itsrerenderaction so as to synchronize with other typesetting actions.Resolves issue mathjax/MathJax#3167.