Make indexing add/set operations toggle _is_closed

Author: lindsayad

include/numerics/distributed_vector.h

@@ -572,10 +572,14 @@ void DistributedVector<T>::set (const numeric_index_type i, const T value)
   libmesh_assert_less (i-first_local_index(), local_size());
 
   _values[i - _first_local_index] = value;
+
+
+  this->_is_closed = false;
 }
 
 
 
+
 template <typename T>
 inline
 void DistributedVector<T>::add (const numeric_index_type i, const T value)
@@ -587,6 +591,9 @@ void DistributedVector<T>::add (const numeric_index_type i, const T value)
   libmesh_assert_less (i-first_local_index(), local_size());
 
   _values[i - _first_local_index] += value;
+
+
+  this->_is_closed = false;
 }