Linux Notification Issue about desktopnotifications

[Ryoumiya]

Looks like the error comes from Dictionary in FreeDesktopNotificationManager.cs

private void OnNotificationClosed((uint id, uint reason) @event)
{
    var notification = _activeNotifications[@event.id];  //<-- Here !
      
    _activeNotifications.Remove(@event.id);

    //TODO: Not sure why but it calls this event twice sometimes
    //In this case the notification has already been removed from the dict.
    if (notification == null)
    {
        return;
    }

    var dismissReason = GetReason(@event.reason);

    NotificationDismissed?.Invoke(this,
        new NotificationDismissedEventArgs(notification, dismissReason));
}

i think i could fix this, let me test a few things first...

[onionware-github]

Same. I also get a crash when I click on the notification itself (not a button) or the close button. Maybe because it tries to get the value from a key without checking if the key exists or the dict get modified by another thread?