title: How do I clear Notifications when I open the app manually and they are not tapped?
body: <p>I managed to make a Firebase cloud function to send me notifications of the latest chat msg. Everything works well. </p>
  
  <p>The notifications arrive when the app is in the background or never started but I can still receive it while the app is in the foreground just fine.</p>
  
  <p>Working fine:</p>
  
  <ul>
  <li>Tap on the notification to open App and dismiss the notification.</li>
  <li>Slide to dismiss the notification.</li>
  </ul>
  
  <p>The Problem: </p>
  
  <ul>
  <li>Manually opening the app does not dismiss the notification.</li>
  </ul>
  
  <p>Idea:</p>
  
  <ul>
  <li>On App Resume or Launch could I clear the notification or all notifications of the same Subscription? I have not found any examples to do this via Flutter but only on Android.</li>
  </ul>