Skip TeX comments correctly. mathjax/MathJax#2271.#413

Draft

dpvc wants to merge 2 commits intodevelopfrom

Commits on Dec 26, 2019

Update FindTeX to properly skip comments, even if they include unbalanced braces. Resolves issue mathjax/MathJax#2271
dpvc
committed

Commits on Dec 31, 2019

Simplify how comments are handled.
dpvc
committed