Equation rendering in HTML Help pages

[bwiernik]

Is your feature request related to a problem? Please describe.
R 4.2 added support for HTML5 in help pages: https://www.r-bloggers.com/2022/04/new-features-in-r-4-2-0/

Many of the features described above are working in VS Code (e.g., the Run Examples button, syntax highlighting), but equations are not being rendered correctly. R 4.2 supports either KaTeX or mathjaxr to render equations in help files such as in ?rnorm.

Describe the solution you'd like
Is it possible to make either katex (preferably) or mathjaxr available to render the equations in VS Code? VS Code ships with built-in KaTeX support for Markdown (https://code.visualstudio.com/updates/v1_58#_math-formula-rendering-in-the-markdown-preview), so it seems like it should be possible to enable for R help files.

[renkun-ken]

Thanks for bringing this up. It would be quite nice if we could make it work in help pages.

@ManuelHentschel It looks like katex resources are blocked in the webview.

Is it possible we could somehow make it work in the webview? It should work if we replace those uris with the served urls from a help server?