`o` no longer toggles showing/hiding the output of a cell

[JasonWeill]

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o no longer toggles showing/hiding the output of a cell, and I don't see any way to add this

Originally filed by @jph00 in #7041, referring to a regression from Jupyter Notebook 6 to 7.

[JasonWeill]

In nbclassic, based on Notebook 6, the o command takes a cell with output:

… and collapses the output:

[jtpio]

Maybe there could be a new command in JupyterLab for toggling the cell output, similar to the existing ones for collapsing and expanding the outputs:

That way the command would also be available in Notebook 7, and could be associated with a keyboard shortcut.

[JasonWeill]

https://github.com/jupyterlab/jupyterlab/pull/16833 is now merged into JupyterLab's codebase. When this is released, likely as part of JupyterLab 4.3.0, we can update Jupyter Notebook's dependency and add a default o shortcut bound to the new command, notebook:toggle-cell-outputs.

[jtpio]

Thanks @JasonWeill for working on this!