message: Minor simplification.
diff: @@ -1007,8 +1007,7 @@ void FABilinearFormExtension::RAP(OperatorHandle &A)
  else
  #endif
  {
  - const SparseMatrix *P = a->fes->GetConformingProlongation();
  - if (P) { a->ConformingAssemble(); }
  + a->ConformingAssemble();
  A.Reset(mat, false);
  }
  }
  @@ -1155,7 +1154,7 @@ void FABilinearFormExtension::EliminateBC(const Array<int> &ess_dofs,
  SparseMatrix *A_mat = A.As<SparseMatrix>();
  // Eliminate essential DOFs (BCs) from the matrix (what we do here is
  - // equivalent to DiagonalPolicy::DIAG_KEEP).
  + // equivalent to DiagonalPolicy::DIAG_ONE).
  const int n_ess_dofs = ess_dofs.Size();
  const auto ess_dofs_d = ess_dofs.Read();
  const auto I = A_mat->ReadI();
  