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Dirty cell flag
I'm not sure this is the right place, but I think it would make sense to add a dirty cell flag to indicate that the cell input has been changed after the cell was run, meaning that the output is not the result of the execution of the input. JupyterLab will soon have a dirty cell visual indicator for that, but I think it should even be part of the Notebook format (see https://github.com/jupyterlab/jupyterlab/pull/10296#issuecomment-849627619).