René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Doc]: Add guidance how to deal with unstable text rendering in downstream tests (such as the changes in 3.11.0rc1)","articleBody":"### Bug summary\n\nHi, using `matplotlib.testing.setup()` on 3.11.0rc1, I get changes in the font rendering compared to 3.10.9, breaking our plotting tests.\n\nHow can I get the same rendering on both versions? I’m happy to change the reference images, but I need to unify the rendering somehow.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\nfrom matplotlib.testing import setup\n\nsetup()\n\nplt.figure(figsize=(4, 1))\nplt.plot(range(3))\nplt.yticks(range(3), [\"Fib\", \"Flib\", \"Flob\"])\nplt.gcf()\n```\n\n### Actual outcome\n\nActually good kerning that I’m excited about seeing in the future!\n\n\u003cimg width=\"369\" height=\"122\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/cd7b4de3-304f-4728-9f90-5bd82974d50c\" /\u003e\n\n### Expected outcome\n\nBad kerning like in 3.10.9\n\n\u003cimg width=\"368\" height=\"122\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/799f8f2c-2643-4755-929e-8c2d2fa23eee\" /\u003e\n\n### Additional information\n\nSee [debug-data-hatch-test.pre.zip](https://github.com/user-attachments/files/27118704/debug-data-hatch-test.pre.zip) for failed test images\n\n### Operating system\n\nmacOS (images above come from there) and Ubuntu (test failures observed there)\n\n### Matplotlib Version\n\n3.11.0rc1\n\n### Matplotlib Backend\n\nAgg\n\n### Python version\n\n3.14.0\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nuv","author":{"url":"https://github.com/flying-sheep","@type":"Person","name":"flying-sheep"},"datePublished":"2026-04-27T08:59:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/31575/matplotlib/issues/31575"}