ChatLine *firstLine = _lines.at(_firstLineRow);
ChatLine *lastLine = _lines.last();
updateSceneRect(QRectF(0, firstLine->pos().y(), width, lastLine->pos().y() + lastLine->height() - firstLine->pos().y()));
ChatLine *firstLine = _lines.at(_firstLineRow);
ChatLine *lastLine = _lines.last();
updateSceneRect(QRectF(0, firstLine->pos().y(), width, lastLine->pos().y() + lastLine->height() - firstLine->pos().y()));