Widget renderer output lost when notebook is closed in JupyterLab

[harrylojames]

JupyterLab doesn't save widget output state when the file is closed, so all cells have to be recomputed to see the output.

When using the jsdom renderer, output is saved between sessions.

As with https://github.com/juba/pyobsplot/issues/2 this is probably an upstream issue!

This appears to be the relevant issue https://github.com/jupyter-widgets/ipywidgets/issues/3823 and it looks like people are making progress to fix it.

I tried downgrading jupyterlab and ipywidgets as suggested here without any luck. https://github.com/jupyterlab/jupyterlab/issues/15361#issuecomment-1828456850

[harrylojames]

I believe this is now the relevant issue https://github.com/jupyter-widgets/ipywidgets/issues/3888