matplotlib.pyplot.figure.show method displays figure two times

首先，使用 matplotlib.pyplot.figure.show，在 Python 3.10.4、ipympl 0.8.7 和列出的 Jupyter 软件包下，于 JupyterLab 3.4.4 中复现重复显示问题。当同一个图形只出现一次时，即可视为完成；该 issue 没有指定源文件或测试，因此定位相关实现和回归覆盖也是工作的一部分。

Describe the issue

matplotlib.pyplot.figure.show method displays figure two times.

Versions

 3.10.4 (main, Mar 31 2022, 08:41:55) [GCC 7.5.0]
ipympl version: 0.8.7
Selected Jupyter core packages...
IPython          : 8.4.0
ipykernel        : 6.9.1
ipywidgets       : 7.6.5
jupyter_client   : 7.2.2
jupyter_core     : 4.10.0
jupyter_server   : 1.18.1
jupyterlab       : 3.4.4
nbclient         : 0.5.13
nbconvert        : 6.4.4
nbformat         : 5.3.0
notebook         : 6.4.12
qtconsole        : not installed
traitlets        : 5.1.1
Known nbextensions:
  config dir: /home/honek/.jupyter/nbconfig
    notebook section
      [--sys-prefix  enabled 
      - Validating: problems found:
        - require?  X [--sys-prefix
      jupyter-threejs/extension  enabled 
      - Validating: problems found:
        - require?  X jupyter-threejs/extension
  config dir: /home/honek/anaconda3/envs/ipympl_test/etc/jupyter/nbconfig
    notebook section
      jupyter-matplotlib/extension  enabled 
      - Validating: OK
      jupyter-js-widgets/extension  enabled 
      - Validating: OK
JupyterLab v3.4.4
/home/honek/anaconda3/envs/ipympl_test/share/jupyter/labextensions
        jupyter-matplotlib v0.10.5 enabled OK
        @jupyter-widgets/jupyterlab-manager v3.0.0 enabled OK (python, jupyterlab_widgets)