Signal emitted whenever a notification changes.
Total number of notifications.
Whether the manager is disposed or not.
The list of notifications.
Add a new notification.
This will trigger the changed signal with an added event.
Notification message
Notification type
Notification option
Notification unique id
Update an existing notification.
If the notification does not exists this won't do anything.
Once updated the notification will be moved at the begin of the notification stack.
Whether the update was successful or not.
Notification manager