[EXTERNAL] Opening new notebook in VSCode can sometimes default to python kernel

Tracked via the following:

• microsoft/vscode#113937

Describe the bug

When opening a new dotnet interactive notebook in VSCode using the .NET Interactive: Create new blank notebook from the command palette, the resulting notebook uses the python jupyter kernel. The notebook can be reopened with the .NET kernel by running View: Reopen Editor With... and selecting .NET Interactive for Jupyter, but it initially opens with the python kernel. I imagine this is what caused the confusion in #1188.

Please complete the following:

Which version of .NET Interactive are you using?

• .NET Interactive Version: 1.0.217503+a53405c9aae40b1ff468e38b641a981f615d8fdb
• VSCode Insiders Version: 1.55.0-insiders
• Jupyter Extension Version: v2021.5.685944597

• OS
  • Windows 10
  • macOS
  • Linux (Please specify distro)
  • iOS
  • Android
• Browser
  • Chrome
  • Edge
  • Firefox
  • Safari
• Frontend
  • Jupyter Notebook
  • Jupyter Lab
  • nteract
  • Visual Studio Code
  • Visual Studio Code Insiders
  • Other (please specify)

[bisen2]

FWIW I just tested this using the insiders build and it is working as expected. The .NET extension defaults to C# and the Jupyter extension does not.

[DonJayamanne]

FYI - Based on disccussions we had with PMs & others, Jupyter extension added an API endpiont for .NET extension to contribute to

registerNewNotebookContent(options: { defaultCellLanguage: string }): void;

Not sure if thats not used. Also last time we had a sync I mentioned a problem with this approach (would work only when .NET extension has been loaded), we need a static contribution.

Here’s the issue at Jupyter end, https://github.com/microsoft/vscode-jupyter/issues/4859