[Gmsh] Saving only compound mesh with physical edge tags.

[Bauta Steen]

Dear Gmsh,

Maybe this is an easy thing I've overlooked. But I am trying understand,
mesh, and save and export a compound (reparamerized) mesh. I have made a
small test example re-meshing a 2D triangle with one troublesome point
(number 2).

The meshing seems to work fine, as Gmsh meshes and displays the compound
surface but when I save the mesh I only seem to get the first grid
belonging to plane surface 1. Is it possible to only save the mesh for the
compound surface 2 with corresponding edge elements (with physical tags)?

The corresponding .geo data is attached here below (I'm running the Gmsh
3.0.5 Windows 10 build):

Point (1) = {0,0,0,0.5};
Point (2) = {0.95,0,0,0.5};
Point (3) = {1,0,0,0.5};
Point (4) = {0,1,0,0.5};
Line (1) = {1,2};
Line (2) = {2,3};
Line (3) = {3,4};
Line (4) = {4,1};
Physical Line (1) = {1,2};
Physical Line (2) = {3};
Physical Line (3) = {4};
Compound Line (5) = {1,2};
Line Loop (1) = {1,2,3,4};
Plane Surface (1) = {1};
Compound Surface (2) = {1};
Physical Surface (1) = {1};
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