[GH-1509] Add support for Latex rendering in markdown cells

[cphyc]

This adds support for displaying inline and displayed Latex equations using Katex in markdown cells, fixing #1509.

The conversion happens before each paragraph is converted from markdown to HTML. At the moment, any parsing error thrown by KaTeX is caught and the chunk ignored. In other words, the following $\thisisinvalid$ will render as-is, including the surrounding $.

Demonstration

Markdown editor

Automatic rendering when leaving the editor

[mattermod]

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[cphyc]

/check-cla

[jespino]

@cphyc We are evaluating how is the best way to handled this. sorry for the delay answering, but let me think a bit more about it and we can decide if we merge it or try to incorporate the existing code from mattermost.

[mattermod]

This PR has been automatically labelled "stale" because it hasn't had recent activity. A core team member will check in on the status of the PR to help with questions. Thank you for your contribution!

/cc @jasonblais @jfrerich @emilyacook

[jespino]

Sorry, I still have to take a look into this.

[cphyc]

Any news on this front?

[cphyc]

Hi, this has been almost a year. Is there any hope of getting this merged or should I close the PR?