In Jupyterlab, It is possible to change the tab space for each constituent of a Jupyter notebook through Settings -> Advanced Settings Editor -> Notebook option and editing the tabSize attribute. However, this changes the tab size for the notebooks for every kernel.
I would like to have 2 tab spaces for Scala kernel and 4 tab spaces (the default) for the rest. It such a setting possible?
No, but you should file an issue about it on the Jupyterlab github, since the devs are pretty responsive to this kind of thing. For example, I got them to implement a way to turn off the crazy-making autoClosingBrackets behavior in all of the editors just by asking nicely.
The definitions/defaults for all of the notebook settings are currently implemented in this json file in the Jupyterlab source. The relevant tabSize setting can be found inside the codeCellConfig field, the description of which is:
The configuration for all code cells.
and it does indeed apply to all code cells, regardless of kernel/language.
