title: Is it possible to check if a notification is visible or canceled?
body: <p>I would like to update notification data, but the only way I found is to launch a new one with the same Id.</p>
  
  <p>The problem is that I don't want to raise a new one if the original has beed canceled.
  Is there a way to tell if a notification is visible or canceled? Or a way to update a notification only if it exists?</p>