[dune-pdelab] Writing subtree of a CompositeGridFunctionSpace to VTK

[Oliver Sander]

Dear pdelab team,
I have written a program that uses a CompositeGridFunctionSpace with two childen,
each of which is a VectorGridFunctionSpace.  Simulation results are written to
VTK using [roughly]

  VTKWriter<GridView> vtkWriter(grid->leafGridView());
  VectorContainer x(compositeGFS);
  PDELab::addSolutionToVTKWriter(vtkWriter,compositeGFS,x);

which works.  However, I actually only want the first subtree in the file.
How do I do that?

Thanks for your help,
Oliver

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