René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Collections could check x- and y- transforms separately to decide whether to autoscale each direction","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\nConsider the following example\r\n```python\r\n\r\nfrom pylab import *\r\nplt.rcdefaults()\r\nfig, ax = plt.subplots()\r\nax.plot([1, 3], [5, 7])\r\nax.vlines(x=[1, 2, 3], ymin=0, ymax=1, transform=ax.get_xaxis_transform())\r\nplt.show()\r\n```\r\nwhere I want to use vlines in a manner similar to axvline, i.e. lines spanning the full axes height (but more efficiently than with repeated calls to axvline, as vlines will create a single LineCollection.\r\n\r\n![test](https://user-images.githubusercontent.com/1322974/67589233-3fbc5280-f758-11e9-9472-538beacdb9d6.png)\r\n\r\nThe autoscaling in the y axis incorrectly goes all the way down to include (0, 1) (coming from the call to vlines), even though these values are in axes coordinates rather than data coordinates.\r\n\r\nIn effect, I *think* this is equivalent to the suggestion at https://github.com/matplotlib/matplotlib/pull/13642#discussion_r264878170.\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: linux\r\n  * Matplotlib version: master or 3.1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): any\r\n  * Python version: 37\r\n  * Jupyter version (if applicable): no\r\n  * Other libraries: \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\n","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2019-10-25T16:52:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/15518/matplotlib/issues/15518"}