// calls to QChatScene::sceneRect() are very expensive. As we manage the scenerect ourselves
// we store the size in a member variable.
QRectF _sceneRect;
+ int _firstLineRow; // the first row to display (aka: not a daychange msg)
void updateSceneRect();
void updateSceneRect(qreal width);
void updateSceneRect(const QRectF &rect);