René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: tight_layout (version 3.5+)","articleBody":"### Bug summary\n\nfig.tight_layout is broken in current matplotlib.\n\n### Code for reproduction\n\n```python\n%pylab\r\nplot([0,1])\r\ntight_layout()\r\n\r\n# happens same way in object mode\r\nfrom matplotlib import pylab as plt\r\nfig, ax = plt.subplots()\r\nax.plot([0,1])\r\nfig.tight_layout()\n```\n\n\n### Actual outcome\n\n![xxx](https://user-images.githubusercontent.com/1273110/159151934-60209128-1a89-4e84-8a21-40ea8c226dc0.png)\r\n\r\nbelow another example from real code that may be instructive\r\n\r\n![xxx](https://user-images.githubusercontent.com/1273110/159151876-7d86f2bd-f293-44df-b382-334855ed03ab.png)\n\n### Expected outcome\n\nfigure scaled to image size, background deleted.\n\n### Additional information\n\nHappens always.\r\n\r\nI do not recall this issue in version before 3.5\r\n\r\nI have no clue why it is happening.  The flaw seems to lay in mpl getting/setting wrong  window size when using tight_layout.  Maybe gtk unhappy with X11.  When I use `mpl.use('Qt5Cairo')` then it just makes the window *and fonts* smaller.  Obviously, `tight_layout` should not change physical window size on screen!  Similar for Gtk4Cairo.  `Gtk4Agg` has similar issues to `Qt5Agg` but does not retain noise in background, just shrinks figure.  I could be related to DPI settings.  It might get them from a different system call than when opening the window?  \r\n\r\nThe only fix I can find is use other plot package, e.g., plotly.\n\n### Operating system\n\nLinux 5.16.14-200.fc35.x86_64 #1 SMP PREEMPT Fri Mar 11 20:31:18 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux\n\n### Matplotlib Version\n\n3.5.1\n\n### Matplotlib Backend\n\nQt5Agg\n\n### Python version\n\nPython 3.10.2\n\n### Jupyter version\n\nN/A\n\n### Installation\n\npip","author":{"url":"https://github.com/2sn","@type":"Person","name":"2sn"},"datePublished":"2022-03-20T07:31:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":76},"url":"https://github.com/22673/matplotlib/issues/22673"}