isChanged method

bool isChanged()

Check if there are any changes in selection.

Comparing using length and two way containsAll check.

Implementation

bool isChanged() {
  if (_originalSelected.length != _constrainedSelected().length) return true;
  if (!_originalSelected.containsAll(_constrainedSelected())) return true;
  if (!_constrainedSelected().toSet().containsAll(_originalSelected))
    return true;
  return false;
}