title: Is it possible to prevent a remote notification from being displayed?
body: <p>I'd like to better control what notifications are being displayed to my users and selectively silence some of them. In order to do this I have implemented a <a href="https://developer.apple.com/reference/usernotifications/unnotificationserviceextension" rel="noreferrer"><code>UNNotificationServiceExtension</code></a>in my app, which allows me to intercept and modify notifications even when my app is not running. The problem however is that even if I don't call <code>didReceive(_:withContentHandler:)</code> the system will still display the remote notification after approximately 30 seconds. How can I prevent this from happening?</p>