go method

@override void go(int delta)

Moves within the history stack by delta entries.

Implementation

@override
void go(int delta) {
  action = .pop;
  index = clampIndex(index + delta);
  final event = HistoryEvent(
    action: action,
    location: location,
    delta: delta,
  );
  for (final e in listeners) {
    e(event);
  }
}