Show TOC

[goerz]

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First off, I'm very impressed with the new retro UI!

I was wondering if it was possible to show a table of contents, preferably in a format similar to the classic notebook TOC2 extension. Presumably, in retrolab, the feature would actually be based on the jupyterlab TOC plugin that's part of the core since v3, but ideally I'd love to see all the "classic" features I mention in https://github.com/jupyterlab/jupyterlab/issues/10452

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[jtpio]

Thanks @goerz.

Currently RetroLab doesn't expose the left and right areas which is where the toc expects to add itself to the shell. And it's not sure it will since the main idea was to keep a single document or widget at a time on the page.

Maybe the JupyterLab Simple Interface with the toc enabled on the left can be a good alternative experience for now?

Also there are a couple of screenshots in https://github.com/jupyterlab/jupyterlab/issues/9869 exploring improvements to the simple interface and give it a more classic look.