code: public ModelAdapter<Model, Item> move(int fromPosition, int toPosition) {
          mItems.move(fromPosition, toPosition, getFastAdapter().getPreItemCount(fromPosition));
          return this;
      }
docs: moves an item within the list from a position to a position
  
  @param fromPosition the position global from which we want to move
  @param toPosition   the global position to which to move
  @return this