Properly disconnect machinery when removing child axes.

Author: anntzer

lib/matplotlib/axes/_base.py

@@ -2237,7 +2237,8 @@ def add_child_axes(self, ax):
         ax.stale_callback = martist._stale_axes_callback
 
         self.child_axes.append(ax)
-        ax._remove_method = self.child_axes.remove
+        ax._remove_method = functools.partial(
+            self.figure._remove_axes, owners=[self.child_axes])
         self.stale = True
         return ax
 

lib/matplotlib/figure.py

@@ -936,11 +936,25 @@ def delaxes(self, ax):
         """
         Remove the `~.axes.Axes` *ax* from the figure; update the current Axes.
         """
+        self._remove_axes(ax, owners=[self._axstack, self._localaxes])
+
+    def _remove_axes(self, ax, owners):
+        """
+        Common helper for removal of standard axes (via delaxes) and of child axes.
+
+        Parameters
+        ----------
+        ax : `~.AxesBase`
+            The Axes to remove.
+        owners
+            List of objects (list or _AxesStack) "owning" the axes, from which the Axes
+            will be remove()d.
+        """
+        for owner in owners:
+            owner.remove(ax)
 
-        self._axstack.remove(ax)
         self._axobservers.process("_axes_change_event", self)
         self.stale = True
-        self._localaxes.remove(ax)
         self.canvas.release_mouse(ax)
 
         for name in ax._axis_names:  # Break link between any shared axes

lib/matplotlib/tests/test_axes.py

@@ -8679,6 +8679,14 @@ def test_cla_clears_children_axes_and_fig():
         assert art.figure is None
 
 
+def test_child_axes_removal():
+    fig, ax = plt.subplots()
+    marginal = ax.inset_axes([1, 0, .1, 1], sharey=ax)
+    marginal_twin = marginal.twinx()
+    marginal.remove()
+    ax.set(xlim=(-1, 1), ylim=(10, 20))
+
+
 def test_scatter_color_repr_error():
 
     def get_next_color():