René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Error using \"set_window_title\" for canvas via backend_qt5agg","articleBody":"**Bug summary**\r\nWhen using \"set_window_title\" I get this error: \r\n    _self.manager.set_window_title(title)\r\nAttributeError: 'NoneType' object has no attribute 'set_window_title'_\r\n\r\nLocated in this file and error:\r\n **File \"..\\lib\\site-packages\\matplotlib\\backend_bases.py\", line 2245, in set_window_title\r\n    self.manager.set_window_title(title)\r\nAttributeError: 'NoneType' object has no attribute 'set_window_title'**\r\n\r\n**Code for reproduction**\r\nself.canvas.set_window_title('Some Text')\r\n\r\n\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Win 10\r\n  * Matplotlib version:  3.3.0rc1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): matplotlib.backends.backend_qt5agg\r\n  * Python version: 3.7.7\r\n  * Other libraries: PyQt5: 5.15.0\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e pip\r\n\r\n\r\n","author":{"url":"https://github.com/xo-HADES-xo","@type":"Person","name":"xo-HADES-xo"},"datePublished":"2020-06-22T14:12:27.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/17716/matplotlib/issues/17716"}