René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Crash when removing a subfigure with a subplot in a figure","articleBody":"### Bug summary\n\nThe program crashes with \"AttributeError: 'list' object has no attribute '_mouseover_set'\" when I create a figure with subfigures, create subplots in the subfigures, and remove a subfigure. \n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\n\nfig = plt.figure()\nsubfigs = fig.subfigures(1, 2)\nsubfigs[0].subplots()\nsubfigs[0].remove()\n```\n\n### Actual outcome\n\n---------------------------------------------------------------------------\nAttributeError                            Traceback (most recent call last)\nCell In[2], [line 8](vscode-notebook-cell:?execution_count=2\u0026line=8)\n      6 subfigs[0].subplots()\n      7 subfigs[1].subplots()\n----\u003e [8](vscode-notebook-cell:?execution_count=2\u0026line=8) subfigs[0].remove()\n\nFile ~/dataviz-render-update-testing/matplotlib/lib/matplotlib/artist.py:260, in Artist.remove(self)\n    257 _ax_flag = False\n    258 if hasattr(self, 'axes') and self.axes:\n    259     # remove from the mouse hit list\n--\u003e [260](https://vscode-remote+ssh-002dremote-002bsccpu5-002ecse-002eust-002ehk.vscode-resource.vscode-cdn.net/data/wluak/dataviz-render-update-testing/~/dataviz-render-update-testing/matplotlib/lib/matplotlib/artist.py:260)     self.axes._mouseover_set.discard(self)\n    261     self.axes.stale = True\n    262     self.axes = None  # decouple the artist from the Axes\n\nAttributeError: 'list' object has no attribute '_mouseover_set'\n\n### Expected outcome\n\nNo crash.\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n0.2.0.dev53882+unknown.g607d2c380.g02b42db27\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nNone","author":{"url":"https://github.com/williamlus","@type":"Person","name":"williamlus"},"datePublished":"2026-03-17T11:36:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/31319/matplotlib/issues/31319"}