jupyter / jupyter/notebook

v 5.7.0 disables nbextensions and configurator tab

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Jupyter Notebook
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Description

I have this installed via conda on py36:

```bash
(py36) └─❱❱❱ conda list nbextensions +9942 16:16 ❰─┘
# packages in environment at /Users/klay6683/miniconda3/envs/py36:
#
# Name Version Build Channel
jupyter_contrib_nbextensions 0.5.0 py36_0 conda-forge
jupyter_nbextensions_configurator 0.4.0 py36_0 conda-forge
```

After updating `notebook` to 5.7.0, my always active extensions have gone (e.g. filtering on the dashboard), and the extra tab for the nbext-configurator in the jupyter notebook is also gone.
Downgrading to 5.6.0 brought my extensions and the configurator back. I did report it with `nbextensions` as well (ipython-contrib/jupyter_contrib_nbextensions#1356) , you can close whichever location is less appropriate.

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the regression with notebook 5.7.0 and the listed conda packages, then compare against notebook 5.6.0, where extensions and the configurator tab work. Review the related jupyter_contrib_nbextensions#1356 report for context. Done means active extensions and the nbextensions configurator tab work again after upgrading.

Written by the indexing model from the issue text.

Assessment

Tech stack
jupyter-notebook
Domain
developer-experience, frontend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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