#include <QtWidgets/QtWidgets>

int main(int argc, char *argv[])
{
  QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
  QApplication app(argc, argv);
  QComboBox *b = new QComboBox();
  b->setWindowTitle(QString("Qt Version: ") + qVersion());
  b->setMinimumWidth(300);

  for (int u = 0; u < 40; ++u) {
      b->addItem(QString("Combobox Item %1").arg(u));
  }

  b->show();
  app.exec();
}