def apply_changes(self): ul = UndoList().describe("Edit Plot Properties") for tab in self.tabs: ui = UndoList() tab.check_out(undolist=ui) print "ui from tab ", type(tab) print ui.dump(detailed=True) print "simplified: ", ui.simplify().dump() print ul.append(ui.simplify()) ul = ul.simplify(preserve_list=True) if len(ul) > 0: uwrap.emit_last(self.plot, "plot-changed", undolist=ul) else: ul = NullUndo() self.app.project.journal.add_undo(ul)