Running a cell producing a plot for a second time, and the plot fails to display

Inizia riproducendo la riesecuzione segnalata della cella %matplotlib widget in JupyterLab con ipympl, quindi confronta la console degli errori del browser e la figura mostrata alla prima e alla seconda esecuzione. Non vengono indicati file sorgente o test; il lavoro è completato quando la riesecuzione della cella mostra in modo affidabile la figura originale senza richiedere plt.show() né creare una seconda figura con colori diversi.

Describe the issue

When using ipympl with the %matplotlib widget magic, I can successfully display a plot. Rerunning the cell with the plot however, fails to re-display the figure.

the following is visible in the error console

Note: that adding plt.show() to the cell and re-running does display a plot however the color of the line in the plot is different, suggesting that this is a new (second) matplotlib figure and not the original.

Versions

 3.8.10 | packaged by conda-forge | (default, May 10 2021, 22:58:09) 
[Clang 11.1.0 ]
ipympl version: 0.9.3
Selected Jupyter core packages...
IPython          : 8.10.0
ipykernel        : 6.21.2
ipywidgets       : 8.0.4
jupyter_client   : 8.0.3
jupyter_core     : 5.2.0
jupyter_server   : 2.3.0
jupyterlab       : 3.5.3
nbclient         : 0.7.2
nbconvert        : 7.2.9
nbformat         : 5.7.3
notebook         : 6.5.2
qtconsole        : not installed
traitlets        : 5.9.0
Known nbextensions:
  config dir: /Users/stevejpurves/.jupyter/nbconfig
    notebook section
      jupyter-js-widgets/extension  enabled 
      - Validating: OK
  config dir: /Users/stevejpurves/miniconda3/envs/em_recharge/etc/jupyter/nbconfig
    notebook section
      bqplot/extension  enabled 
      - Validating: OK
      ipyevents/extension  enabled 
      - Validating: OK
      ipysheet/extension  enabled 
      - Validating: OK
      ipytree/extension  enabled 
      - Validating: OK
      jupyter-leaflet/extension  enabled 
      - Validating: OK
      jupyter-matplotlib/extension  enabled 
      - Validating: OK
      jupyter-js-widgets/extension  enabled 
      - Validating: OK
JupyterLab v3.5.3
/Users/stevejpurves/miniconda3/envs/em_recharge/share/jupyter/labextensions
        ipytree v0.2.2 enabled OK
        jupyterlab_pygments v0.2.2 enabled OK (python, jupyterlab_pygments)
        bqplot v0.5.37 enabled OK (python, bqplot)
        jupyter-matplotlib v0.11.3 enabled OK
        jupyter-leaflet v0.17.2 enabled OK
        ipysheet v0.7.0 enabled OK (python, ipysheet)
        ipyevents v2.0.1 enabled OK
        @jupyter-widgets/jupyterlab-manager v5.0.5 enabled OK (python, jupyterlab_widgets)