test: cap matplotlib<3.11 to stabilize image-comparison baselines#1208
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #1208 +/- ##
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Coverage 75.29% 75.29%
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Files 59 59
Lines 8429 8429
Branches 1395 1395
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matplotlib 3.11.0 (released 2026-06-12) shifts scatter/alpha rasterization past the RMS tolerance, failing
test_plot_spatial_scatter_categorical_alpha(RMS 51.18 vs tol 50) on thehatch-test ...-stableenvs. This breaks CI repo-wide —mainand every open PR go red onceuvresolves 3.11.Cap
matplotlib<3.11in the test dependency-group only; the runtime dependency stays open, so users and downstream libraries still resolve 3.11. Temporary until the baseline is regenerated against 3.11.Mirrors scverse/spatialdata-plot#713.