message: UI-CPP: flipped direction of mouse scroll.
diff: @@ -581,7 +581,7 @@ void SpinWidget::wheelEvent(QWheelEvent *event)
  else
  {
  float wheel_delta = event->angleDelta().y();
  - m_view.mouseScroll(wheel_delta * 0.1 * scale);
  + m_view.mouseScroll(-wheel_delta * 0.1 * scale);
  QTimer::singleShot(1, this, SLOT(update()));
  }
  