Recover from failure to render mimetype #6181
Merged
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It's easier to review the diff while disabling whitespace diffs: https://github.com/jupyter/notebook/pull/6181/files?diff=split&w=1
This is closer to JupyterLab's behavior.
As an example, if a Jupyter widget fails to render (due to widget state not found), we display other available mimetypes instead of nothing.
This goes in the direction of this PR: matplotlib/ipympl#343 (add support for saving a static version of the matplotlib plot next to the widget mimetype) which works properly in JupyterLab but not in Notebook yet.
PR goes in pair with jupyter-widgets/ipywidgets#3280