René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"new margin system doesn't handle negative values in bars","articleBody":"While working on https://github.com/matplotlib/matplotlib/pull/5538#issuecomment-206662711 (allow artists to opt-out from being considered by the autoscaler), I noticed that the new margins machinery doesn't handle negative values in bar plots very well:\n\n```\nfrom matplotlib import pyplot as plt\nfig, axs = plt.subplots(1, 2)\n\n# wanted behavior: remove the margin at y=0.\naxs[0].bar(0, 1)\n\n# unwanted behavior: remove the margin at y=-1\naxs[1].bar(0, -1)\n\nplt.show()\n```\n\n![bar](https://cloud.githubusercontent.com/assets/1322974/18817039/fc0df558-830a-11e6-8d2b-b1e77b5250a5.png)\n\nattn @mdboom\n","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2016-09-25T17:30:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/7175/matplotlib/issues/7175"}