pushForegroundDisplay property
Display notifications while the app is in the foreground. FCM does not
draw a notification when the app is open — on Android nothing shows unless
the app renders it, and on iOS the banner is suppressed by default. With
this true (default) the SDK shows it for you: a native banner on iOS and
a local notification on Android, tap-attributed like a background open. Set
false if you handle FirebaseMessaging.onMessage yourself.
Implementation
final bool pushForegroundDisplay;