QListWidget: keyboard navigation refuses to work if there are some hidden items at the top.

#include <QtWidgets>
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    QListWidget w;

    for (int i = 0; i < 400; i++)
        new QListWidgetItem(QString::number(i) + " Line", &w);
    for (int i = 0; i < 20; i++)
        w.item(i)->setHidden(true);

    w.show();
    return app.exec();
}