6672b5373f
Fixes the packing operators that use ED_uvedit_pack_islands_multi Also fixes UV Select Similar with hidden UV islands. Packing operators using GEO_uv_parametrizer should remain unchanged. Add a check to BM_elem_flag_test(efa, BM_ELEM_HIDDEN). Note that BM_mesh_calc_face_groups doesn't easily support XOR of flags, requiring logic to be moved to a preprocess step on BM_ELEM_TAG. Regression in rBe3075f3cf7ce. Differential Revision: https://developer.blender.org/D17055