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06ef58bad8
test(libslic3r): replace the disabled convex_hull_2d test, closing #11269 The last "failing libslic3r test" from #11269 was the disabled SCENARIO("2D convex hull of sinking object", "[3mf][.]") in test_3mf.cpp. It checked ModelObject::convex_hull_2d for a sinking object against PrusaSlicer's reference hull, but Orca's convex_hull_2d does not clip geometry below the bed the way PrusaSlicer's its_convex_hull_2d_above does, so the reference never matched. The test also wrote a debug mesh to a hardcoded /tmp path and its comparison loop was inverted. Remove it and add tests/libslic3r/test_model.cpp characterizing convex_hull_2d on non-sinking transforms (identity and scale+offset), where the projected footprint is unambiguous. Homed in a Model test file since it exercises ModelObject, not 3MF.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: