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@QuLogic QuLogic commented Jan 22, 2026

PR summary

If Pillow is old enough to not support a feature at all, then it will warn about it (e.g., https://github.com/matplotlib/matplotlib/actions/runs/21232201791/job/61092807364#step:13:182). If you're running the whole test suite, then something else seems to cause pytest to treat it as benign. But if you run only test_agg.py, then our -Werror setting will cause it to fail test collection.

PR checklist

If Pillow is old enough to not support a feature _at all_, then it will
warn about it. If you're running the whole test suite, then something
else seems to cause pytest to treat it as benign. But if you run only
`test_agg.py`, then our `-Werror` setting will cause it to fail test
collection.
@QuLogic QuLogic added this to the v3.11.0 milestone Jan 22, 2026
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