can't activate vscode python plugin when opening an ipynb file

[tom-shan]

Description

The vscode python plugin is not activated when an ipynb file is opened, so the notbook editor is not showing. Only when a python file is opened first and vscode python plugin is activated successfully, the ipynb file can be opened in notebook editor.

Reproduction Steps

OS and Theia version:
OS: centos 7
theia: d5f3262
python plugin: 2020.1.58038
Diagnostics:

Per

theia/packages/plugin-ext/src/main/browser/plugin-contribution-handler.ts

Line 212 in d5f3262

() => this.onDidActivateLanguage(language, () => this.monacoTextmateService.activateLanguage(language))

, only the language which contains grammars contaibutions can be activated.

vscode python plugin contains no grammars contribution of jupyter according to:
https://github.com/microsoft/vscode-python/blob/master/package.json#L45
and
https://github.com/microsoft/vscode-python/blob/ead69d5e2e910153e5715b6f4a7abf41f23efac5/package.json#L2778-L2784

[vince-fugnitto]

@tom-shan does the plugin activate correctly in vscode when first opening a .ipynb file?

[tom-shan]

@tom-shan does the plugin activate correctly in vscode when first opening a .ipynb file?

yes, it activate correctly