src/vs/workbench/browser/parts/notifications/notificationsViewer.ts/NotificationTemplateRenderer/renderSource
class NotificationTemplateRenderer:	private renderSource(notification: INotificationViewItem): void {
		if (notification.expanded && notification.source) {
			this.template.source.textContent = localize('notificationSource', "Source: {0}", notification.source);
			this.template.source.title = notification.source;
		} else {
			this.template.source.textContent = '';
			this.template.source.removeAttribute('title');
		}
	}