Not able to fold strings in CodeMirror 6

[AyushPatel101]

Describe the issue

See original issue for more details - jupyterlab/jupyterlab#17464

It seems like as part of CodeMirror 5 -> CodeMirror 6, strings in Python are not able to fold. I would appreciate any attention getting this working again.

Browser and platform

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Reproduction link

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[marijnh]

This only worked in 5 because it simply looked at indentation, and I guess you indented your string's continued lines.

I suppose, with Python's docstring convention, big strings aren't uncommon. Attached patch adds a fold rule for them.