message: UI-CPP: save screenshots in png format instead of bmp.
diff: @@ -291,7 +291,7 @@ void SpinWidget::resizeGL(int width, int height)
  void SpinWidget::screenShot(std::string filename)
  {
  auto pixmap = this->grab();
  - pixmap.save((filename+".bmp").c_str());
  + pixmap.save((filename + ".png").c_str());
  }
  void SpinWidget::updateData()
  