René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH]: Remove `canvas.draw` from `widgets.Cursor.onmove`","articleBody":"### Problem\n\nA busy icon appears every time the mouse goes off the axes and the cursor is cleared.\r\nFor image files ~100MB, the busy icon lasts 1-2 seconds each time.\r\n\r\nSample code:\r\n```python\r\nfrom matplotlib.widgets import Cursor\r\nfrom matplotlib import pyplot as plt\r\nfrom matplotlib import cm\r\nfrom PIL import Image\r\n\r\nfig, ax = plt.subplots()\r\n\r\nimg = Image.open(r\"Path to large image file ~100MB\")\r\nax.imshow(img, cmap=cm.gray)\r\n\r\ncursor = Cursor(ax, useblit=True, color='red', linewidth=1)\r\n\r\nplt.show()\r\n```\n\n### Proposed solution\n\nI think the behavior of not clearing the cursor when the mouse goes off the axes is acceptable.\r\nIt is also consistent with the behavior of the similar class `MultiCursor` which doesn't call  `canvas.draw`.\r\n\r\nIf accepted, the following lines can be removed and `needclear` will also be removed:\r\nhttps://github.com/matplotlib/matplotlib/blob/ff552f45f2d30c76120fe0355306afac9a9dd2da/lib/matplotlib/widgets.py#L2015-L2017\r\n\r\n","author":{"url":"https://github.com/komoto48g","@type":"Person","name":"komoto48g"},"datePublished":"2023-09-23T19:03:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/26901/matplotlib/issues/26901"}