Add an option to continue indentation, upgrade @codemirror/commands

[krassowski]

References

Closes #16196

Code changes

• update @codemirror/commands
• add an option to continue indentation
• add a test

User-facing changes

New continue indentation option:

TBD, as the current behaviour of insertNewlineKeepIndent turned out to be different from what I thought it would do, see codemirror/dev#1370 (comment).

Depending on whether upstream (CodeMirror) reconsiders, we may need to do something different, for example always run insertNewlineAndIndent while comparing the indentation before and after and if it decreased at the end of the block we would re-add the indentation. Or maybe we need to vendor a modified copy of insertNewlineAndIndent which does not dedent at the end of the block (not sure if this is feasible). Or maybe we need to modify the Python language implementation only in which case this PR would be of little use in the current state.

Backwards-incompatible changes

None

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