title: Flutter show app icon badge on push notification
body: <p>I'm looking for a way to show an app icon badge when a user receives a push notification.</p>
  
  <p>I'm using the Firebase_messaging plugin for flutter for the handling of the push notifications and flutter_app_badger for the app icon badges. 
  But I want to combine the two so that the number is set on the icon without opening the app. Is it possible to make this happen? Or am I overlooking something obvious from the firebase_messaging plugin?</p>
  
  <p>Sorry for the horrible explanation. I hope someone can help me with this issue.</p>