When pwa is in background, the serviceworker still uses onMessage not onBackgroundMessage!

Hello,

when I send a push notification to my app, the onMessage method is called even if it is in the background! Actually, the onBackgroundMessage should then be called, right? The problem now is that when I tap on the message box in Android, the Progressive Web Application is not brought to the foreground. Apparently Android thinks that the app is in the foreground? The message box disappears when I tap on it and the number of incoming messages also disappears from the app icon.

Is there any way to fix this?

The onMessage is defined in a service
`this.message$ = new Observable(sub => onMessage(this.messaging, it => sub.next(it))).pipe(
tap(payload => {this.print.info('MessagingService initFCMMessaging() FCM fmessage', { payload });})
);`

The onBackgroundMessage is defined in the firebase-messaging-sw.js with static text.

`messaging.onBackgroundMessage(function(payload) {
// Customize notification here
const notificationTitle = 'My title';
const notificationOptions = {
body: 'My Bodytext',
icon: '/firebase-logo.png' || '/assets/icons/icon-72x72.png'
};

self.registration.showNotification(notificationTitle, notificationOptions);
});`

I only noticed this because I defined a static text for the background message.

Commencez par comparer la configuration de onMessage du service avec l’enregistrement de onBackgroundMessage dans firebase-messaging-sw.js, puis reproduisez le comportement avec la PWA en arrière-plan. Le travail est terminé lorsque le handler attendu est établi et que le comportement lors de l’appui sur la notification est corrigé ou que la limitation est clairement documentée.

Rédigé par le modèle d'indexation à partir du texte de l'issue.