message: Use DiffusionIntegrator's IntegrationRule in VectorDiffusionIntegrator::AssembleElementVector.
diff: @@ -2261,11 +2261,7 @@ void VectorDiffusionIntegrator::AssembleElementVector(
  const IntegrationRule *ir = IntRule;
  if (ir == NULL)
  {
  - // integrand is rational function if det(J) is not constant
  - int order = 2 * Tr.OrderGrad(&el); // order of the numerator
  - ir = (el.Space() == FunctionSpace::rQk) ?
  - &RefinedIntRules.Get(el.GetGeomType(), order) :
  - &IntRules.Get(el.GetGeomType(), order);
  + ir = &DiffusionIntegrator::GetRule(el,el);
  }
  elvect = 0.0;
  