René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: MacOS screen capture causes wx backend exception","articleBody":"### Bug summary\r\n\r\nWhen the screen capture shortcut (Shift+Control+Command+4) is used to record a MPL window, an exception occurs in backend_wx.py. \r\n\r\n### Code for reproduction\r\n\r\n```python\r\nimport matplotlib\r\nmatplotlib.use('WxAgg')\r\nimport matplotlib.pyplot as plt\r\nfig, ax = plt.subplots()\r\nfruits = ['apple', 'blueberry', 'cherry', 'orange']\r\ncounts = [40, 100, 30, 55]\r\nbar_labels = ['red', 'blue', '_red', 'orange']\r\nbar_colors = ['tab:red', 'tab:blue', 'tab:red', 'tab:orange']\r\nax.bar(fruits, counts, label=bar_labels, color=bar_colors)\r\nax.set_ylabel('fruit supply')\r\nax.set_title('Fruit supply by kind and color')\r\nax.legend(title='Fruit color')\r\nplt.show()\r\n\r\n# run the above code (or anything else with WxAgg selected) in pythonw and\r\n# then with the MPL window active, press Shift+Control at the same time\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\nThis exception occurs: \r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"/Users/toby/mamba310/envs/py310all/lib/python3.10/site-packages/matplotlib/backends/backend_wx.py\", line 753, in _on_key_down\r\n    self._get_key(event), *self._mpl_coords(),\r\n  File \"/Users/toby/mamba310/envs/py310all/lib/python3.10/site-packages/matplotlib/backends/backend_wx.py\", line 732, in _get_key\r\n    if not (key_name == 'shift' and key.isupper()):\r\nAttributeError: 'NoneType' object has no attribute 'isupper'\r\n```\r\n\r\n### Expected outcome\r\n\r\nno exception\r\n\r\n### Additional information\r\n\r\ncheck if key is None before trying to use any methods of it\r\n\r\n### Operating system\r\n\r\nMacOS 13.5\r\n\r\n### Matplotlib Version\r\n\r\n3.6.2\r\n\r\n### Matplotlib Backend\r\n\r\nWxAgg\r\n\r\n### Python version\r\n\r\n3.10.8\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\nconda","author":{"url":"https://github.com/briantoby","@type":"Person","name":"briantoby"},"datePublished":"2023-08-24T02:57:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/26587/matplotlib/issues/26587"}