Settings editor does not load tabs of some plugins on first open

[krassowski]

Description

When "Settings" Editor is opened before the loading/transformation of settings completed, the tabs for packages which were not ready are not shown. Closing and re-opening the "Settings" Editor after the settings for remaining packages got loaded helps.

This especially affects Code Completion and Inline Completer settings (both using jupyter.lab.transform), but it was also reported for extensions which do not use jupyter.lab.transform but are just loaded later, e.g.:

• Settings missing from v3 deshaw/jupyterlab-execute-time#98

Another report for this issue was in: jupyter-lsp/jupyterlab-lsp#1053

Reproduce

1. Open "Settings Editor"
2. Take a note of the list of "SETTINGS"
3. Refresh page (so that JupyterLab loads with "Settings Editor" already open)
4. Compare the list of "SETTINGS" now with the one from step (2)
5. See that a number of tabs is now missing

On first open	After reopening

Expected behavior

Settings for all plugins are are shown regardless of when they get loaded/activated/transformed.

There are two options:

• (a) the "Settings" widget shows with whatever is ready and additional tabs show up as new plugins finish loading or as transformation of settings gets completed
• (b) the "Settings" widget only opens once all plugins are ready

I think we should go for (a) because (b) might lead to the "Settings" widget not showing up in a reasonable time at all.

Context

• JupyterLab version: 4.1.2