matplotlib / matplotlib/ipympl

issue with matplotlib widget on Jupyterlab-1.1.0rc (and before)

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Dominant language
Jupyter Notebook
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Description

I rarely get the proper widget:
- either it's the buttons on the left during 1/10 of a second, then the drawing only,
- either it's the reverrse (see below)
![image](https://user-images.githubusercontent.com/4312421/63668716-2c345000-c7d8-11e9-8ba7-4d57bd0a16e4.png)
- sometime it comes right. (when I try plot instead of plot.show(), but there is no clear pattern.

I note that there is an apparent "comm" problem
![image](https://user-images.githubusercontent.com/4312421/63668764-4bcb7880-c7d8-11e9-836b-b87e52805ab3.png)

what could be the problem ?
![image](https://user-images.githubusercontent.com/4312421/63668795-70bfeb80-c7d8-11e9-806d-5827a6dd5195.png)

Contributor guide

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  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 widget behavior in JupyterLab 1.1.0rc using both plot and plot.show(), then inspect the apparent comm problem shown in the screenshots. Done means identifying the cause and making the widget reliably display both its controls and drawing.

Written by the indexing model from the issue text.

Assessment

Tech stack
jupyter-notebook
Domain
frontend, web-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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