[Gmsh] Problem when extruding a surface

[Michel Cassagnes]

Dear all,

I have a surface containing points and lines (file enclosed).

When I extrude this surface, without extruding points and lines inside,
Gmsh doesn't keep lines correctly. What can be seen on screen doesn't even
match with script file. Please try with the file and comment/uncomment
Extrude lines.

For example, line 19 on screen is between points 19 and 23, in script it is
between points 22 and 23.

Thanks for your help !

Michel Cassagnes
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