added add_subplot comment re hashing

pelson · pelson · commit bbc289990176 · 2012-06-17T08:01:50.000+01:00
diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
@@ -791,6 +791,8 @@ def add_subplot(self, *args, **kwargs):
 
             a = args[0]
             assert(a.get_figure() is self)
+            # make a key for the subplot (which includes the axes object id
+            # in the hash)
             key = self._make_key(*args, **kwargs)
         else:
             projection_class, kwargs, key = \
