CSS stylesheets are not deduplicated

[fcollonval]

Description

Stylesheets are duplicated in some examples - maybe in other places too:

Reproduce

Execute the example packages/react/src/examples/Notebook.tsx.

Open the style applied on a cell.

Expected behavior

Lumino and JupyterLab stylesheets are deduplicated (this is known to be not trivial).

Context

• Datalayer version:
• Operating System and version:
• Browser and version:

Browser Output

Paste the output from your browser Javascript console here.

[echarles]

Tip: @fcollonval says to import the js and not the css

[echarles]

@fcollonval I have pushed https://github.com/datalayer/jupyter-ui/commit/5db5420581aa646377de2c005374dec576865891 to use the index.js instead of the css when available. It is still functional and looks to me like it has less duplicates. Could you please check based on your previous experiment? Thx!