Method _notify

client/scripts/ui.js:423–447

(message, body)

    }

    _notify(message, body) {
        const config = {
            body: body,
            icon: '/images/logo_transparent_128x128.png',
        }
        let notification;
        try {
            notification = new Notification(message, config);
        } catch (e) {
            // Android doesn't support "new Notification" if service worker is installed
            if (!serviceWorker || !serviceWorker.showNotification) return;
            notification = serviceWorker.showNotification(message, config);
        }

        // Notification is persistent on Android. We have to close it manually
        const visibilitychangeHandler = () => {                             
            if (document.visibilityState === 'visible') {    
                notification.close();
                Events.off('visibilitychange', visibilitychangeHandler);
            }                                                       
        };                                                                                
        Events.on('visibilitychange', visibilitychangeHandler);

        return notification;
    }

    _messageNotification(message) {
        if (document.visibilityState !== 'visible') {