Integrate ICompletionItems

[edzkite]

References

LSP extension companion changes to jupyterlab/jupyterlab#7044

Dependent on jupyterlab/jupyterlab#8080

Code changes

• Update LSP fetcher to use ICompletionItems
• Transform Kernel reply into ICompletionItems
• Update merge_replies to combine ICompletionItems

User-facing changes

• JupyterLab will now render display text vs. insert text.
  
• Previously:
  

Backwards-incompatible changes

None that I know of.

Chores

• linted
• tested
• documented
• changelog entry

[edzkite]

@krassowski @bollwyvl

I wasn't quite sure what to do with https://github.com/krassowski/jupyterlab-lsp/pull/239/files#diff-946ab02cbbf4548a7fbb8487c842e4e8R361
and https://github.com/krassowski/jupyterlab-lsp/pull/239/files#diff-946ab02cbbf4548a7fbb8487c842e4e8R361

With the new API, are these pieces still necessary?

[krassowski]

@edzkite would you be interested in following up on this? I could push to this branch to change the target JupyterLab version to 2.2 so that the changes from your upstream PR that this one depends on will be there.

[edzkite]

@krassowski We decided to fork the extension a couple of months ago to further customize its capabilities, and our changes' upstream compatibility is limited.

That said, please feel free to use this branch as a starting point for integrating with the new completions API if desired.

[bollwyvl]

Bummer, man, sad to see you go. Good luck with your work, and thanks for this starting point!

[edzkite]

Yeah of course! Best of luck to you guys as well, and looking forward to future opportunities for collaboration!