Commands stop working after serviceManager changes due to empty currentWidget in addNotebookCommands

[501981732]

When the serviceManager changes, all previously registered commands become invalid.
The root cause seems to be that in addNotebookCommands, this._tracker.currentWidget is null (empty), which leads to command execution failures.

[501981732]

I'd like to work on this issue

[echarles]

Awesome @501981732 Do you have a env setup? (see doc on https://jupyter-ui.datalayer.tech/docs/develop/dev-environment/)

You could start hacking based on this example which changes the service manager of a Notebook

https://github.com/datalayer/jupyter-ui/blob/main/packages/react/src/examples/JupyterLabAppServiceManager.tsx

That example uses Notebook and not Notebook2 - We will soon remove Notebook to only use Notebook2, so better to use Notebook2.