Update to JupyterLab 4.2.0b0

[jtpio]

Update to https://github.com/jupyterlab/jupyterlab/releases/tag/v4.2.0b0

[github-actions]

👈 Launch a Binder on branch jtpio/notebook/update-lab-420b0

[jtpio]

Now seeing the following error in the dev tools console, which seems related to jupyterlab/jupyterlab#14683 :

[jtpio]

cc @afshin do you know what the main DOM differences are between the defer and full modes? Gonna look into updating the CSS to fix #7231.

For now the browser default scrollbar is still missing.

[krassowski]

Default to defer for now

I think this is fine. There is less of a user benefit for Notebook than for Lab from using full windowed mode because users may have 10 long notebooks in Lab opened in a single browser tab, but not in Notebook.

[jtpio]

Is there a way to set the windowing mode without going through the settings?

Otherwise this also changes the windowing mode used in JupyterLab (if notebook is opened), as the settings are shared between notebook and lab. There is a similar issue with Notebook setting the file browser checkboxes by default, which currently also show up in lab (jupyterlab/jupyterlab#14623).

[krassowski]

It looks like you would need to override the notebookConfig in factory: https://github.com/jupyterlab/jupyterlab/blob/6152e3a5f94d728ccd2727d6d8413f12ddafb669/packages/notebook-extension/src/index.ts#L1867-L1898

An alternative would be to use setting transforms to change the default value temporarily.

[jtpio]

An alternative would be to use setting transforms to change the default value temporarily.

Looks like that would mean using a setting transform for the @jupyterlab/notebook-extension:tracker plugin, which is the one defining the windowingMode? https://github.com/jupyterlab/jupyterlab/blob/6152e3a5f94d728ccd2727d6d8413f12ddafb669/packages/notebook-extension/schema/tracker.json#L816
But the setting file does not seem to have jupyter.lab.transform set to true.

[jtpio]

Opened #7318 to have a look later to not block this PR.

If anyone would like to help with this or #7231 that would be appreciated, thanks!