Add new notifications at the top of the list

Summary:
This will show a list with the most recent notifications at the top, in the
plasmoid.

This is more consistent with the KDE notification plasmoid that stack them like
this too.

Reviewers: apol, #kde_connect

Reviewed By: apol, #kde_connect

Subscribers: kdeconnect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D13540

interfaces/notificationsmodel.cpp

@@ -102,10 +102,9 @@ void NotificationsModel::setDeviceId(const QString& deviceId)
 
 void NotificationsModel::notificationAdded(const QString& id)
 {
-    int currentSize = m_notificationList.size();
-    beginInsertRows(QModelIndex(),  currentSize, currentSize);
+    beginInsertRows(QModelIndex(),  0, 0);
     NotificationDbusInterface* dbusInterface = new NotificationDbusInterface(m_deviceId, id, this);
-    m_notificationList.append(dbusInterface);
+    m_notificationList.prepend(dbusInterface);
     endInsertRows();
 }