René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"toolbar.update() breaks history","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\n**Bug summary**\r\n\r\nI'm looking for resetting the zoom and pan history of interactve browsing. Using `toolbar.update()` breaks the interactive history, it's not possible to go back to the previous axis state.\r\n\r\n**Code for reproduction**\r\n\r\nRun this code in python a console:\r\n```python\r\nfrom matplotlib import pyplot as plt\r\nf = plt.figure()\r\nplt.plot([1, 2, 5])\r\nplt.show(block=False)\r\nf.canvas.toolbar._views._elements  # One element\r\nf.canvas.toolbar._positions._elements  # One element\r\nf.canvas.toolbar.update()\r\nf.canvas.toolbar._views._elements  # Empty !\r\nf.canvas.toolbar._positions._elements  # Empty !\r\n# Zoom once\r\n# Try to go back using the home button or back arrow\r\n```\r\n\r\n**Actual outcome**\r\n\r\nThe view doesn't change when pressing home button or back arrow\r\n\r\n**Expected outcome**\r\n\r\nI expect to be able to got back to the state the plot was in when `f.canvas.toolbar.update()` was called, but since the history is completely empty, there is no state to go back to. I think the current state should be added right after clearing the history. Is it possible to do it manually in the meantime ?\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: Arch Linux\r\n  * Matplotlib version: 2.1.0-1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.6.3\r\n  * Jupyter version (if applicable):\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/Nodd","@type":"Person","name":"Nodd"},"datePublished":"2017-12-11T15:25:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/9974/matplotlib/issues/9974"}