fix run cells breaking on non-header markdown cells

[andrewfulton9]

References

Fixes #12026
If this could be backported to 3.3.x, that would be great too.

Code changes

in the toc-extension runCells command, the logic of when to break out of a loop running each code cell is amended so that the loop is not broken if MarkdownCell.headingInfo.level is equal to -1 (markdown cell is not a header)

User-facing changes

Now code cells under a ToC section are run after runCells is called even if they are under a non-header markdown cell

Backwards-incompatible changes

None that I am aware

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[krassowski]

Worth adding a test case?

[fcollonval]

@andrewfulton9 you can add it in galata/test/jupyterlab/toc-running.test.ts as it test that feature. You should be able to test it by changing the generated notebook (see beforeEach). And to test cell output content, you could look at the test Check cell output # in galata/test/jupyterlab/notebook-run.test.ts

[andrewfulton9]

@fcollonval, thanks for the extra context for updating the test. I'll try to get that added today.

[fcollonval]

@meeseeksdev please backport to 3.3.x