Bug in switch_tetrahedron?

[jiangzhongshi]

The following test would fail. Switching tet changes the edge it points to.

TEST_CASE("switch_face_tet", "[test_tuple]")
{
    TetMesh m;
    m.init(5, {{{0, 1, 2, 3}}, {{0, 1, 4, 2}}, {{0, 1, 3, 4}}});
    auto e = m.tuple_from_edge(0, 3);

    spdlog::critical("edge {} {} {} {}", e.tid(), e.fid(m), e.eid(m), e.vid());
    e = e.switch_face(m);
    spdlog::critical("edge {} ({}) {} {}", e.tid(), e.fid(m), e.eid(m), e.vid());
    auto edge0 = e.eid(m);
    e = e.switch_tetrahedron(m).value();
    spdlog::critical("edge ({}) {} {} {}", e.tid(), e.fid(m), e.eid(m), e.vid());
    auto edge1 = e.eid(m);
    REQUIRE(edge0 == edge1);
}

The output is as follows, note that the last line changes the id of the edge from 3 to 0.

[2021-12-14 17:36:24.441] [critical] edge 0 1 3 0
[2021-12-14 17:36:24.442] [critical] edge 0 (2) 3 0
[2021-12-14 17:36:24.442] [critical] edge (2) 2 0 0

[Yixin-Hu]

fixed here: #13