[OpenMesh] [bug] UVs serialization broken (superfluous edges) when using .obj

Hi,

As the title suggests. Tried with ready builds for 10.0 as well as compiled 11.0. I do not have access to GitLab, otherwise I would have posted there. The situation occurs both for quad (which are auto triangulated since I am using TriMesh) and tri meshes, for mesh of any kind of complexity, when using .obj as input (for instance monkey Suzanne from Blender), and when parametrized with OpenMesh::IO::Options::VertexTexCoord.

Thank you in advance