insert_new_node

# File ext/json/lib/json/editor.rb, line 418
      def insert_new_node(item)
        if current = selection.selected
          parent = current.parent or return
          parent_parent = parent.parent
          parent_type = parent.type
          if parent_type == 'Array'
            selected_index = parent.each_with_index do |c, i|
              break i if c == current
            end
            type, content = ask_for_element(parent)
            type or return
            iter = model.insert_before(parent, current)
            iter.type, iter.content = type, content
            toplevel.display_status("Inserted an element to " +
              "'#{parent_type}' before index #{selected_index}.")
            window.change
          else
            toplevel.display_status(
              "Cannot insert node below '#{parent_type}'!")
          end
        else
            toplevel.display_status("Append a node into the root first!")
        end
      end