It seems `ref_measure_rigid_rotation` is not used out of this file. https://github.com/spglib/spglib/blob/23a0125be1f55efc20804947440449c9f2e9655c/src/refinement.c#L1522
It seems
ref_measure_rigid_rotationis not used out of this file.spglib/src/refinement.c
Line 1522 in 23a0125