Persist KaTeX macros across render calls

[chrisyeh96]

This PR fixes the regression identified in #125425.

Sets the "globalGroup" option in KaTeX to true for both markdown file previews and for notebook cell rendering.

Now, markdown such as the following should render properly:

$\newcommand{\ra}{\rightarrow}$

$\ra$

[mjbvz]

Thanks! This will be in the next insiders build and is scheduled for VS Code 1.60

[mjbvz]

Were you seeing this working? I just merged this but when I tested the above equation, it still shows:

ParseError: KaTeX parse error: Undefined control sequence: \ra at position 1: \̲r̲a̲

[chrisyeh96]

@mjbvz No, I didn't actually build VSCode with my changes. (It would really nice to have GitHub Codespaces to try out new builds!)

I was hoping that this would just work, but I guess I wasn't lucky this time. Any chance you could help debug this? Being able to persist KaTeX macros across render calls would be a huge plus for me.

[mjbvz]

Ok, please try building and debugging VS Code locally to see what may be going wrong