Bug summary

Create a contour plot CS, add contour labels based on CS, remove the contour labels, then remove CS.

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np

delta = 0.025
x = np.arange(-3.0, 3.0, delta)
y = np.arange(-2.0, 2.0, delta)
X, Y = np.meshgrid(x, y)
Z1 = np.exp(-X**2 - Y**2)
Z2 = np.exp(-(X - 1)**2 - (Y - 1)**2)
Z = (Z1 - Z2) * 2

fig, ax = plt.subplots()
ax.contourf(X, Y, Z)
CS = ax.contour(X, Y, Z, visible=False)
labels = ax.clabel(CS, colors='k')
for label in labels: label.remove()
labels = ax.clabel(CS, colors='r')
CS.remove()

Actual outcome

ValueError Traceback (most recent call last)
Cell In[1], line 18
16 for label in labels: label.remove()
17 labels = ax.clabel(CS, colors='r')
---> 18 CS.remove()

File ~/dataviz-render-update-testing/matplotlib/lib/matplotlib/contour.py:518, in ContourLabeler.remove(self)
516 super().remove()
517 for text in self.labelTexts:
--> 518 text.remove()

File ~/dataviz-render-update-testing/matplotlib/lib/matplotlib/artist.py:254, in Artist.remove(self)
249 # There is no method to set the callback. Instead, the parent should
250 # set the _remove_method attribute directly. This would be a
251 # protected attribute if Python supported that sort of thing. The
252 # callback has one parameter, which is the child to be removed.
253 if self._remove_method is not None:
--> 254 self._remove_method(self)
255 # clear stale callback
256 self.stale_callback = None

ValueError: list.remove(x): x not in list

Expected outcome

Additional information

No response

Operating system

No response

Matplotlib Version

0.2.0.dev53961+unknown.g607d2c380.g9e38f5437

Matplotlib Backend

No response

Python version

No response

Jupyter version

No response

Installation

None