Fix inheritance diagram rendering in documentation

.github/workflows/python-app.yml

@@ -53,13 +53,15 @@ jobs:
 
     # The trick below is necessary because the generic environment file does not specify a Python version, and only
     # "conda env update" can be used to update with an environment file, which upgrades the Python version
+    # (we add "graphviz" from dev-environment to solve all dependencies at once, at graphviz relies on image
+    # processing packages very much like geo-packages; not a problem for docs, dev installs where all is done at once)
     - name: Install base environment with a fixed Python version
       if: steps.cache.outputs.cache-hit != 'true'
       run: |
         mamba install pyyaml python=${{ matrix.python-version }}
         pkgs_conda_base=`python .github/get_yml_env_nopy.py "environment.yml" --p "conda"`
         pkgs_pip_base=`python .github/get_yml_env_nopy.py "environment.yml" --p "pip"`
-        mamba install python=${{ matrix.python-version }} $pkgs_conda_base
+        mamba install python=${{ matrix.python-version }} $pkgs_conda_base graphviz
         if [[ "$pkgs_pip_base" != "None" ]]; then
           pip install $pkgs_pip_base
         fi

dev-environment.yml

@@ -14,6 +14,7 @@ dependencies:
 
   # Development-specific
   - autovizwidget
+  - graphviz
   - sphinx
   - myst-nb
   - sphinx-autodoc-typehints

doc/source/conf.py

@@ -117,6 +117,9 @@
     "xdem.dem.DEM": "xdem.DEM",
 }
 
+# To have an edge color that works in both dark and light mode
+inheritance_edge_attrs = {"color": "dodgerblue1"}
+
 # To avoid fuzzy PNGs
 graphviz_output_format = "svg"