Fix of #7170. Delayed notification is not moved until push will succeed.

src/slic3r/GUI/NotificationManager.hpp

@@ -706,6 +706,7 @@ private:
 	// Otherwise another delay interval waiting. Timestamp is 0. 
 	// Note that notification object is constructed when being added to the waiting list, but there are no updates called on it and its timer is reset at regular push.
 	// Also note that no control of same notification is done during push_delayed_notification_data but if waiting notif fails to push, it continues waiting.
+	// If delay_interval is 0, notification is pushed only after initial_delay no matter the result. 
 	void push_delayed_notification_data(std::unique_ptr<NotificationManager::PopNotification> notification, std::function<bool(void)> condition_callback, int64_t initial_delay, int64_t delay_interval);
 	//finds older notification of same type and moves it to the end of queue. returns true if found
 	bool activate_existing(const NotificationManager::PopNotification* notification);