René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Change in custom norm colour map display","articleBody":"Compare https://matplotlib.org/stable/tutorials/colors/colormapnorms.html\r\n\r\n![image](https://user-images.githubusercontent.com/302469/124570164-9d9daa80-de14-11eb-86b4-91979081c562.png)\r\n\r\nvs https://matplotlib.org/devdocs/tutorials/colors/colormapnorms.html\r\n\r\n![image](https://user-images.githubusercontent.com/302469/124570133-97a7c980-de14-11eb-9072-4c63204bf1d7.png)\r\n\r\nThe same thing happens with the custom norm at the end of the tutorial. I'm not sure about `TwoSlopeNorm`, but at least for the custom one, the 0 is definitely not supposed to be in the middle. This _half_ broke when merging #20054, with the 0 tick at the old place but the 0 colour in the middle. Then with d1c5a6ab163f507e8b0f1b3871e0de8d72266098, the 0 tick also moved to the middle.","author":{"url":"https://github.com/QuLogic","@type":"Person","name":"QuLogic"},"datePublished":"2021-07-06T08:47:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/20581/matplotlib/issues/20581"}