message: Show the dropdown on arrow press (linux)
diff: @@ -26,6 +26,10 @@ void AutocompleteComboBox::keyPressEvent(QKeyEvent *event) {
  case Qt::Key_Escape:
  QComboBox::keyPressEvent(event);
  break;
  + case Qt::Key_Down:
  + case Qt::Key_Up:
  + showPopup();
  + break;
  default:
  QComboBox::keyPressEvent(event);
  }
  