ENH: try to allow any hashable key

tacaswell · tacaswell · commit 07c80a2d599c · 2020-03-03T08:12:38.000-05:00
diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
@@ -1629,10 +1629,10 @@ def _process_layout(layout):
                 for k, v in enumerate(row):
                     if v == empty_sentinel:
                         continue
-                    elif isinstance(v, (int, str, Axes)):
-                        unique_ids.add(v)
-                    else:
+                    elif not isinstance(v, str) and isinstance(v, Iterable):
                         nested[(j, k)] = v
+                    else:
+                        unique_ids.add(v)
 
             return unique_ids, nested
 
