René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Tool Manager example broken","articleBody":"### Bug summary\n\nThe [Tool Manager example](https://matplotlib.org/devdocs/gallery/user_interfaces/toolmanager_sgskip.html) doesn't work.\r\n\r\n\n\n### Code for reproduction\n\n```python\npython toolmanager_sgskip.py\n```\n\n\n### Actual outcome\n\n- Tools are not added:\r\nhttps://github.com/matplotlib/matplotlib/blob/0c1aa86575126d5659bf885c7f283bbf2744fc4b/examples/user_interfaces/toolmanager_sgskip.py#L77-L78\r\n![grafik](https://user-images.githubusercontent.com/19879328/147918695-8902c162-94fa-406c-bc7f-dbd9e16648f0.png)\r\n\r\n\r\n- Clicking on \"Configure subplots\" icon ![grafik](https://user-images.githubusercontent.com/19879328/147918724-1c336544-5e65-4d31-b522-06de1c011893.png) crashes the program:\r\n```\r\nTraceback (most recent call last):\r\n  File \"C:\\Programs\\Python38\\lib\\site-packages\\matplotlib\\backends\\backend_qt.py\", line 930, in handler\r\n    self.trigger_tool(name)\r\n  File \"C:\\Programs\\Python38\\lib\\site-packages\\matplotlib\\backend_bases.py\", line 3391, in trigger_tool\r\n    self.toolmanager.trigger_tool(name, sender=self)\r\n  File \"C:\\Programs\\Python38\\lib\\site-packages\\matplotlib\\backend_managers.py\", line 379, in trigger_tool\r\n    self._trigger_tool(name, sender, canvasevent, data)\r\n  File \"C:\\Programs\\Python38\\lib\\site-packages\\matplotlib\\backend_managers.py\", line 394, in _trigger_tool\r\n    tool.trigger(sender, canvasevent, data)\r\n  File \"C:\\Programs\\Python38\\lib\\site-packages\\matplotlib\\backends\\backend_qt.py\", line 970, in trigger\r\n    NavigationToolbar2QT.configure_subplots(\r\n  File \"C:\\Programs\\Python38\\lib\\site-packages\\matplotlib\\backends\\backend_qt.py\", line 753, in configure_subplots\r\n    if self._subplot_dialog is None:\r\nAttributeError: 'types.SimpleNamespace' object has no attribute '_subplot_dialog'\r\n```\n\n### Expected outcome\n\n- tools being added\r\n- no crash\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n3.5.1\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\n_No response_","author":{"url":"https://github.com/StefRe","@type":"Person","name":"StefRe"},"datePublished":"2022-01-03T10:10:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/22088/matplotlib/issues/22088"}