René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[BUG] redirect-from sphinx extension is not parallel safe","articleBody":"### Summary\r\n\r\nCI builds the docs in parallel since https://github.com/matplotlib/matplotlib/pull/20718.\r\n\r\nThis doesn't work correctly with redirects: in #24054 it raises\r\n```\r\nTraceback (most recent call last):\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/cmd/build.py\", line 279, in build_main\r\n    app.build(args.force_all, filenames)\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/application.py\", line 350, in build\r\n    self.builder.build_update()\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/builders/__init__.py\", line 302, in build_update\r\n    self.build(to_build,\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/builders/__init__.py\", line 318, in build\r\n    updated_docnames = set(self.read())\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/builders/__init__.py\", line 423, in read\r\n    self._read_parallel(docnames, nproc=self.app.parallel)\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/builders/__init__.py\", line 479, in _read_parallel\r\n    tasks.join()\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/util/parallel.py\", line 105, in join\r\n    if not self._join_one():\r\n  File \"/home/circleci/.local/lib/python3.8/site-packages/sphinx/util/parallel.py\", line 126, in _join_one\r\n    raise SphinxParallelError(*result)\r\nsphinx.errors.SphinxParallelError: ValueError: gallery/pyplots/dollar_ticks is already noted as redirecting to gallery/ticks/dollar_ticks\r\n\r\nSphinx parallel build error:\r\nValueError: gallery/pyplots/dollar_ticks is already noted as redirecting to gallery/ticks/dollar_ticks\r\n```\r\n\r\n(see also #21876)\r\n\r\n### Proposed fix\r\n\r\nRevert afef2e62f9f8f183b895cf1b001ea04365ee3a56.","author":{"url":"https://github.com/StefRe","@type":"Person","name":"StefRe"},"datePublished":"2022-09-30T07:51:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/24058/matplotlib/issues/24058"}