Default toolbar overlaps figure

The issue centers on the toolbar_position behavior in the Jupyter Notebook integration; start by locating the implementation that places the default toolbar and any related layout tests. Reproduce the overlap with constrained_layout=True, then verify that the toolbar and figure occupy separate boxes for the chosen positioning behavior.

Describe the issue

The default position of the toolbar is on the left, where it overlaps the figure.
Especially when the constrained_layout=True keyword is used when creating the figure,
this is highly undesirable.

Possible solutions or workarounds:

• Minimal fix: Change the default to anything other then "left"; I think that with the current design, "right" would be by far the best. It would minimize the likelihood of an overlap.
• The real fix: When the toolbar_position is on the left, position the figure to its right. Ideally, all toolbar positions should be in boxes that never overlap the figure box. With this scheme I suggest putting the default toolbar on the top or bottom, and flush left, to match all of the other matplotlib interactive backends.

Versions

 3.8.13 | packaged by conda-forge | (default, Mar 25 2022, 06:06:49)
[Clang 12.0.1 ]
ipympl version: 0.9.2
Selected Jupyter core packages...
IPython          : 8.5.0
ipykernel        : 6.16.0
ipywidgets       : 7.7.0
jupyter_client   : 7.3.5
jupyter_core     : 4.11.1
jupyter_server   : 1.23.1
jupyterlab       : 3.5.0
nbclient         : 0.6.8
nbconvert        : 7.0.0
nbformat         : 5.6.1
notebook         : 6.5.2
qtconsole        : 5.3.1
traitlets        : 5.4.0
Known nbextensions:
  config dir: /Users/efiring/.jupyter/nbconfig
    notebook section
      matplotlib/extension  enabled
      - Validating: problems found:
        - require?  X matplotlib/extension
  config dir: /Users/efiring/miniconda3/envs/py38/etc/jupyter/nbconfig
    notebook section
      jupyter-matplotlib/extension  enabled
      - Validating: OK
      jupyter-js-widgets/extension  enabled
      - Validating: OK
JupyterLab v3.5.0
/Users/efiring/miniconda3/envs/py38/share/jupyter/labextensions
        jupyterlab_pygments v0.2.2 enabled OK (python, jupyterlab_pygments)
        jupyter-matplotlib v0.11.2 enabled OK
        @jupyter-widgets/jupyterlab-manager v3.1.1 enabled OK (python, jupyterlab_widgets)