create_node (JSONTreeView)

         # File lib/json/editor.rb, line 812
    812:       def create_node(parent, type, content)
    813:         iter = if parent
    814:           model.append(parent)
    815:         else
    816:           new_model = Editor.data2model(nil)
    817:           toplevel.view_new_model(new_model)
    818:           new_model.iter_first
    819:         end
    820:         iter.type, iter.content = type, content
    821:         expand_collapse(parent) if parent
    822:         iter
    823:       end