Meta-issue with left over tasks

[fcollonval]

This is a reboot of #381 - in order to move forward on https://github.com/jupyter/notebook/issues/6220

The approach taken differs from #381 as it creates a stand-alone app (similarly to retrolab - JLab remix) in order to:

• Deal with the DOM manipulation induced by RevealJS that don't play nicely in webapp such JupyterLab
• Add the opportunity to spin a notebook focusing on slideshow experience

What it does:

• Add button in JupyterLab notebook toolbar to open the RISE view of the current notebook
• Support federated extension in RISE mode (in particular ipywidgets are working)
• ~~Restructure completely the package to be a single python package with multiple npm packages to ship a single package for the classical notebook and JupyterLab~~
• Support ipywidget
• Run on Binder for ~~the classical notebook and~~ JupyterLab ~~(but failed to open the standalone app from JupyterLab)~~

What it partly do:

• Create a ugly slideshow with no configuration

What needs to be done:

• [ ] Improve styling
• [x] properly handle all kinds of cells (subslide, fragment, ...)
• [x] Render slideshow in side-by-side panel within JupyterLab
• [x] ~~Create custom notebook factory to remove the toolbar~~ Explicitly dispose the toolbar (avoid dealing with specific factory)
• [x] ~~Turn off virtual rendering~~ Wait for fully rendering before converting to slideshow (placeholder cannot be removed due to DOM hierarchy change for Reveal)
• [ ] Turn off heading collapse feat.
• [x] Check Jupyter Widget interact
• Implement as much features as possible from classical:
  • [x] Support RevealJS theming
  • [x] Support shortcuts
  • [x] Support Jupytext (not tested may already work)
    PR opened: https://github.com/mwouts/jupytext/pull/877
  • [x] Dynamically load custom CSS
  • Deal with configuration:
    • [x] at JupyterLab level
    • [x] at notebook level
• x [out of scope] Allow to edit style info from cell toolbar (updating extension??)
• x [out of scope] [optional] Bring something like split-cell classic extension
• [ ] Smart execution
• [ ] Documentation
• [ ] CI job to at least test it installs

Help will be really appreciate to cover the above points - don't hesitate to open PRs against this PR branch.

[nthiery]

Tested here after a pip installation, and it worked smoothly for what I tried.

Thank you!!!

[vidartf]

This should probably be reviewed again, and individual tasks split into separate issues.