private void Host_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName != "CurrentPresenter") return;
if (_config.Host.CurrentPresenter == _previousPresenter)
return;
_previousPresenter = _config.Host.CurrentPresenter;
if (_previousPresenter == null)
_stateManager.Remove(_config.HistoryKey);
else
{
_stateManager.InsertOrUpdate(_config.HistoryKey, _previousPresenter.GetHistoryValue());
_stateManager.CommitChanges(_previousPresenter.DisplayName);
UpdateTitle(_previousPresenter);
}
}