René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: CI: either remove, or separate cairocffi CI paths","articleBody":"### Summary\n\nThe `cairocffi` dependency was added to (Travis) CI to support the `pgi` object bindings (0ed289cffd20e49bc791ffb7f59b4220670d2e9f) that are no-longer-supported (3221c94ad29d6899d7ae7d62b2b7150d9e1685c1).\n\nHowever: `cairocffi` will still be used if `cairo` (e.g. `pycairo`) is unavailable at runtime: https://github.com/matplotlib/matplotlib/blob/6fc8169112a42e3f6f55793a6b56159cd8ff69d7/lib/matplotlib/backends/backend_cairo.py#L15-L26\n\nWe currently install `cairocffi` during GitHub Actions CI unit testing; so there is a possibility that it would mask failures to import and exercise `pycairo`-based test coverage.\n\nNB: This is my current understanding as I explore #29732 - I'm not 100% confident about my findings.\n\n### Proposed fix\n\nIdeally, I think we should extract a separate `cairocffi`-based GitHub Actions CI unit test matrix job, so that both `pycairo` and `cairocffi` are exercised.\n\nAs a fallback if that proves infeasible, we could remove `cairocffi` from the dependencies installed during CI workflows.","author":{"url":"https://github.com/jayaddison","@type":"Person","name":"jayaddison"},"datePublished":"2025-03-28T15:34:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/29822/matplotlib/issues/29822"}