[dune-pdelab] Assigning a BlockVector to an istl VectorBackend container

[Oliver Sander]

Dear pdelab,

I have code that assembles an FE problem using pdelab and the istl backend.  Vector stuff ends
up in an istl::VectorBackend container type, and all is well.  However, at one point I need
to assign a vector given in a plain BlockVector to the istl::VectorBackend container.  This
used to be possible with

 myVectorBackendContainer.base() = myBlockVector;

This doesn't work anymore.  I can get the same result with

 *(xV.storage()) = x;

but that's a bit ugly.  What is the official way to assign a BlockVector to the corresponding
istl VectorBackend Container type?

Thanks,
Oliver

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