Merge pull request #8051 from SergeyAxiomatic/fix/hover-label-mathjax-559

Render hover labels through MathJax when the whole label is one tex expression

Author: KoolADE85

draftlogs/8051_fix.md

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+- Fix hover labels ignoring MathJax for text that is a single tex expression [[#8051](https://github.com/plotly/plotly.js/pull/8051)], with thanks to @SergeyAxiomatic 
+- Fix XSS via `javascript:` URLs in MathJax `\href` macros by sanitizing links in MathJax-rendered text [[#8051](https://github.com/plotly/plotly.js/pull/8051)], with thanks to @SergeyAxiomatic