René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Clarify that constrained_layout and tight_layout conflict with each other","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nNot sure if this an expected behaviour, but the colorbar seems to be ignored when using `tight_layout`. Example taken from the \"Constrained Layout Guide\"  (https://matplotlib.org/3.1.3/tutorials/intermediate/constrainedlayout_guide.html#colorbars).\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n```python\r\narr = np.arange(100).reshape((10, 10))\r\nfig, axs = plt.subplots(2, 2, figsize=(4, 4), constrained_layout=True)\r\nfor ax in axs.flat:\r\n    im = ax.pcolormesh(arr)\r\nfig.colorbar(im, ax=axs, shrink=0.6)\r\nplt.tight_layout()\r\n```\r\n\r\n**Actual outcome**\r\n\r\n![image](https://user-images.githubusercontent.com/11851990/81168951-e5663f00-8f8f-11ea-85ea-4dabce14e081.png)\r\n\r\n**Expected outcome**\r\nThis is the outcome before calling `plt.tight_layout()`\r\n\r\n![image](https://user-images.githubusercontent.com/11851990/81167425-185b0380-8f8d-11ea-8010-059d63f93e47.png)\r\n\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: Fedora 31\r\n  * Matplotlib version: 3.1.3 from conda defaults (3.2.1 from conda-forge behave similarly)\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.7.6\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/ericpre","@type":"Person","name":"ericpre"},"datePublished":"2020-05-06T10:55:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/17339/matplotlib/issues/17339"}