emoji in comment should not be processed #742
Description
The following md:
So this: <!-- begin-inline-katex \def\arraystretch{1.5} \begin{array}{c:c:c} a & b & c \\ \hline d & e & f \\ \hdashline g & h & i \end{array} end-inline-katex-->will be rendered as:
<p>So this: <!-- begin-inline-katex \def\arraystretch{1.5} \begin{array}{c<img class="emoji" src="https://assets-cdn.github.com/images/icons/emoji/c.png" alt="c" />c} a & b & c \\ \hline d & e & f \\ \hdashline g & h & i \end{array} end-inline-katex--></p>It is expected to leave the content in comments unchanged.