René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: macOS backend leaks NSTrackingArea","articleBody":"### Bug summary\n\nAssuming that #31751 is fixed, the macOS backend will still leak the NSTrackingArea created in `FigureCanvas_init`.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\nplt.subplots()\nplt.show()\n```\n\n### Actual outcome\n\nA NSTrackingArea object has a retainCount of +2. After the view hierarchy is dealloc'd, the retainCount is still +1.\n\n### Expected outcome\n\nThe NSTrackingArea is freed when the view hierarchy is freed.\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nmacOS 14.7\n\n### Matplotlib Version\n\n0.2.0.dev54528+unknown.gf4cf12592.d20260526\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/iccir","@type":"Person","name":"iccir"},"datePublished":"2026-05-27T19:25:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/31754/matplotlib/issues/31754"}