clear method
void
clear()
Add New Group of Changes and Clear Redo Stack Clear Undo History
Implementation
// void addGroup<T>(List<Change<T>> changes) {
// _applyChanges(changes);
// _history.addLast(changes);
// _moveForward();
// }
// void _applyChanges(MyChange change) {
// change.execute();
// }
/// Clear Undo History
void clear() => clearHistory();