[Gmsh] Virtual topology problem

[Martin Kraska]

Hello, 

in the attached script I try to mesh a step part using virtual topology (trying to update the example [ https://github.com/mkraska/CalculiX-Examples/tree/master/CAD/OnshapeTutorial | https://github.com/mkraska/CalculiX-Examples/tree/master/CAD/OnshapeTutorial ] ) 
I see that I have to use a new syntax for virtual topology but otherwise did not make any changes compared to gmsh 3.0.3 which I tried last. 

In gmsh 4.3.0 I get a boundary mesh issue. 
In 4.4.0 the virtual topology is just ignored but the part is meshed. 
in the git version of today (2019-07-22) I get a slightly different boundary mesh issue. 

Did I miss some settings? Or is the part just too nasty? 

Thanks for any advice, Martin Kraska 
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