René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"New colorbar doesn't handle norms without a scale properly...","articleBody":"As reported at astropy by @dstansby:  (astropy/astropy#11800) colorbars with norms that do *not* have a scale associated with them are not being ticked properly.  \r\n\r\n```\r\nimport matplotlib.pyplot as plt \r\nimport numpy as np\r\nimport matplotlib.colors as mcolors\r\n\r\nfig, ax = plt.subplots()\r\n\r\npc = ax.imshow(np.arange(100).reshape(10, 10), norm=mcolors.TwoSlopeNorm(20, 0, 100), cmap='RdBu_r')\r\n\r\ncb = fig.colorbar(pc, extend='both')\r\nplt.show()\r\n\r\n```\r\n\r\n### 3.4.2 (correct)\r\n\r\n![olddd](https://user-images.githubusercontent.com/1562854/120031714-05f3a380-bfae-11eb-9e14-622cf95f7b3c.png)\r\n\r\n### Master (incorrect)\r\n\r\n![newww](https://user-images.githubusercontent.com/1562854/120031742-0ee47500-bfae-11eb-9089-244fd8790434.png)\r\n\r\n","author":{"url":"https://github.com/jklymak","@type":"Person","name":"jklymak"},"datePublished":"2021-05-28T19:13:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/20324/matplotlib/issues/20324"}