message: GetProlongationMatrix instead of Dof_TrueDof_Matrix.
diff: @@ -127,8 +127,8 @@ Operator &ParNonlinearForm::GetGradient(const Vector &x) const
  MFEM_ABORT("TODO: assemble contributions from shared face terms");
  }
  - // TODO - construct Dof_TrueDof_Matrix directly in the pGrad format
  - Ph.ConvertFrom(pfes->Dof_TrueDof_Matrix());
  + // RAP the local gradient dA.
  + Ph.ConvertFrom(pfes->GetProlongationMatrix());
  pGrad.MakePtAP(dA, Ph);
  // Impose b.c. on pGrad
  