classpetanque::ChangeStacksys::Obj petanque::ChangeStackChangeStackmakeSourcenew make()onRedoSource Void onRedo(Editor editor)Redo a change. Do nothing if all change have already been redone.onUndoSource Void onUndo(Editor editor)Undo a change. Do nothing if all change have already been undone.pushSource Void push(Change change)Push a Change onto the stack.