René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Regression: undocumented change of behaviour in mpl 3.4.2 with axis ticks direction","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nTicks direction set with `Axes.tick_params` used to be persistent but is now erased by `Axes.cla()`.\r\nMaybe this change is actually intended ? in any case I couldn't find a mention of it in your release notes so I'm considering it a bug for now.\r\n\r\n**Code for reproduction**\r\n\r\nI originally detected a regression in yt, see https://github.com/yt-project/yt/issues/3256\r\nI was able to reproduce the change of behaviour with the following minimal script\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\n\r\nfrom matplotlib import __version__ as mplver\r\n\r\nfig, ax = plt.subplots()\r\nax.tick_params(direction=\"in\")\r\nax.cla()\r\nfig.savefig(f\"/tmp/mpl_{mplver}_regr.jpg\")\r\n```\r\n\r\n**Actual outcome**\r\n\r\nThis is with matplotlib 3.4.2\r\n\r\n![mpl_3 4 2_regr](https://user-images.githubusercontent.com/14075922/118125955-f1cd7500-b3f7-11eb-8292-03e4064d1d00.jpg)\r\n\r\n**Expected outcome**\r\n\r\nThis is with matplotlib 3.4.1\r\n![mpl_3 4 1_regr](https://user-images.githubusercontent.com/14075922/118125979-f6922900-b3f7-11eb-8d80-7abec5b4202e.jpg)\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: OSX\r\n  * Matplotlib version (`import matplotlib; print(matplotlib.__version__)`): see above\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): MaxOSX\r\n  * Python version: 3.9\r\n\r\ninstalled from pypi with pip","author":{"url":"https://github.com/neutrinoceros","@type":"Person","name":"neutrinoceros"},"datePublished":"2021-05-13T12:37:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/20219/matplotlib/issues/20219"}