Backport PR #22806: FIX: callback for subfigure uses parent

greglucas · meeseeksmachine · commit f399844b89e0 · 2022-04-13T01:41:21.000Z
diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
@@ -946,7 +946,6 @@ def clear(self, keep_observers=False):
             a gui widget is tracking the Axes in the figure.
         """
         self.suppressComposite = None
-        self.callbacks = cbook.CallbackRegistry()
 
         # first clear the axes in any subfigures
         for subfig in self.subfigs:
@@ -2051,6 +2050,8 @@ def __init__(self, parent, subplotspec, *,
         self._subplotspec = subplotspec
         self._parent = parent
         self.figure = parent.figure
+        self.callbacks = parent.callbacks
+
         # subfigures use the parent axstack
         self._axstack = parent._axstack
         self.subplotpars = parent.subplotpars
