Fix tests: New version fo traitlets (#64)

The new version of traitlets fixes the rendering of the config help that
was over-indented

Author: Carreau

pyproject.toml

@@ -53,6 +53,7 @@ test = [
     "nbval",
     "notebook",
     "pytest",
+    "matplotlib"
 ]
 
 [project.urls]

tests/notebooks/config_InlineBackend.ipynb

@@ -43,38 +43,37 @@
       "----------------------------------------\n",
       "InlineBackend.close_figures=<Bool>\n",
       "    Close all figures at the end of each cell.\n",
-      "            When True, ensures that each cell starts with no active figures, but it\n",
-      "            also means that one must keep track of references in order to edit or\n",
-      "            redraw figures in subsequent cells. This mode is ideal for the notebook,\n",
-      "            where residual plots from other cells might be surprising.\n",
-      "            When False, one must call figure() to create new figures. This means\n",
-      "            that gcf() and getfigs() can reference figures created in other cells,\n",
-      "            and the active figure can continue to be edited with pylab/pyplot\n",
-      "            methods that reference the current active figure. This mode facilitates\n",
-      "            iterative editing of figures, and behaves most consistently with\n",
-      "            other matplotlib backends, but figure barriers between cells must\n",
-      "            be explicit.\n",
+      "\n",
+      "    When True, ensures that each cell starts with no active figures, but it also\n",
+      "    means that one must keep track of references in order to edit or redraw\n",
+      "    figures in subsequent cells. This mode is ideal for the notebook, where\n",
+      "    residual plots from other cells might be surprising.\n",
+      "\n",
+      "    When False, one must call figure() to create new figures. This means that\n",
+      "    gcf() and getfigs() can reference figures created in other cells, and the\n",
+      "    active figure can continue to be edited with pylab/pyplot methods that\n",
+      "    reference the current active figure. This mode facilitates iterative editing\n",
+      "    of figures, and behaves most consistently with other matplotlib backends,\n",
+      "    but figure barriers between cells must be explicit.\n",
       "    Current: True\n",
       "InlineBackend.figure_format=<Unicode>\n",
-      "    The figure format to enable (deprecated\n",
-      "                                             use `figure_formats` instead)\n",
+      "    The figure format to enable (deprecated use `figure_formats` instead)\n",
       "    Current: ''\n",
       "InlineBackend.figure_formats=<set-item-1>...\n",
-      "    A set of figure formats to enable: 'png',\n",
-      "                    'retina', 'jpeg', 'svg', 'pdf'.\n",
+      "    A set of figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.\n",
       "    Current: {'jpeg'}\n",
       "InlineBackend.print_figure_kwargs=<key-1>=<value-1>...\n",
       "    Extra kwargs to be passed to fig.canvas.print_figure.\n",
-      "            Logical examples include: bbox_inches, pil_kwargs, etc. In addition,\n",
-      "            see the docstrings of `set_matplotlib_formats`.\n",
+      "\n",
+      "    Logical examples include: bbox_inches, pil_kwargs, etc. In addition, see the\n",
+      "    docstrings of `set_matplotlib_formats`.\n",
       "    Current: {'bbox_inches': None, 'pil_kwargs': {'quality': 90, 'optimize': True}}\n",
       "InlineBackend.rc=<key-1>=<value-1>...\n",
-      "    Dict to manage matplotlib configuration defaults in the inline\n",
-      "            backend. As of v0.1.4 IPython/Jupyter do not override defaults out of\n",
-      "            the box, but third-party tools may use it to manage rc data. To change\n",
-      "            personal defaults for matplotlib,  use matplotlib's configuration\n",
-      "            tools, or customize this class in your `ipython_config.py` file for\n",
-      "            IPython/Jupyter-specific usage.\n",
+      "    Dict to manage matplotlib configuration defaults in the inline backend. As\n",
+      "    of v0.1.4 IPython/Jupyter do not override defaults out of the box, but\n",
+      "    third-party tools may use it to manage rc data. To change personal defaults\n",
+      "    for matplotlib,  use matplotlib's configuration tools, or customize this\n",
+      "    class in your `ipython_config.py` file for IPython/Jupyter-specific usage.\n",
       "    Current: {}\n"
      ]
     }