Set foreground service behavior

app/src/main/java/eu/faircode/email/ServiceExternal.java

@@ -144,6 +144,7 @@ public class ServiceExternal extends Service {
     private Notification getNotification() {
         NotificationCompat.Builder builder =
                 new NotificationCompat.Builder(this, "service")
+                        .setForegroundServiceBehavior(Notification.FOREGROUND_SERVICE_DEFERRED)
                         .setSmallIcon(R.drawable.baseline_compare_arrows_white_24)
                         .setContentTitle(getString(R.string.tile_synchronize))
                         .setAutoCancel(false)

app/src/main/java/eu/faircode/email/ServiceSend.java

@@ -231,6 +231,7 @@ public class ServiceSend extends ServiceBase implements SharedPreferences.OnShar
     private Notification getNotificationService(boolean alert) {
         NotificationCompat.Builder builder =
                 new NotificationCompat.Builder(this, "send")
+                        .setForegroundServiceBehavior(Notification.FOREGROUND_SERVICE_IMMEDIATE)
                         .setSmallIcon(R.drawable.baseline_send_white_24)
                         .setContentTitle(getString(R.string.title_notification_sending))
                         .setContentIntent(getPendingIntent(this))

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -1461,6 +1461,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
         // Build notification
         NotificationCompat.Builder builder =
                 new NotificationCompat.Builder(this, "service")
+                        .setForegroundServiceBehavior(Notification.FOREGROUND_SERVICE_DEFAULT)
                         .setSmallIcon(R.drawable.baseline_compare_arrows_white_24)
                         .setContentIntent(piWhy)
                         .setAutoCancel(false)