On opening an existing notebook with widget fallback output to a different mimetype

[DonJayamanne]

On opening an existing notebook with widget fallback output to a different mimetype if an ipywidget needs an active kernel connection
Refs: #8635

• web @rebornix
• anyOS @amunger
• anyOS @roblourens

Complexity: 5

Authors: @DonJayamanne

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Requirements

• Install prerelease jupyter extension into VS Code (desktop or http://insiders.vscode.dev)
• Have a python environment that you can run jupyter from. (https://jupyter.org/install)
• Be familiar with jupyter notebooks
• Have ipywidgets installed into your python environment using the command python -m pip install ipywidgets
• Install matplot lib pip install matplotlib ipympl

Setup

• Run a cell with the following code

%matplotlib widget

from matplotlib import pyplot as plt

fig, ax = plt.subplots()
ax.plot([0,1,2], [2,3,4] ,"o-")

• Verify the widget is rendered and you can interact with the widget using the controls in the output (such as panning, zoom, etc)
• Close the notebook and re-open the notebook
• Verify you can still see a plot (this time its not interactive)
• Re-load VSCode and open the same notebook and you should still see the plot displayed (though its not interactive)

[roblourens]

Does this work by redirecting the interactive renderer to a primitive one? Because it says it's rendering the ipywidget when I guess it's actually rendering a png

It works as described but it seems backwards that you would tell me you are using an interactive renderer when that is not the case

[roblourens]

Btw regarding the complexity on this, I feel that it would be complexity 5 for other team members, but for the manually assigned people, it is not difficult to verify :)