How to insert an item at a specific index of QListWidget?

[schrute]

I need to insert an item at a specific index in a QListWidget, however it seems the QListWidget::insertItem function is not working correctly. I have created a sample application with the following code in which I am able to reproduce the issue

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    // Create a QListWidget
    QListWidget *listWidget = new QListWidget(this);

    for (int row: {0, 1, 2, 0, 0}) {
        auto item = new QListWidgetItem(listWidget);
        listWidget->insertItem(row, item);

        auto widget = new QLabel("Item " + QString::number(row), listWidget);
        widget->setAlignment(Qt::AlignCenter);
        listWidget->setItemWidget(item, widget);
    }

    // Set the QListWidget as the central widget
    setCentralWidget(listWidget);
}

I get the following output for the above code

Does this look like the correct behaviour? I was expecting the final order to be 0,0,0,1,2

Qt Version - 5.15.8 and 6.8

[Christian Ehrlicher]

You can't insert an item which is already inserted: https://doc.qt.io/qt-6/qlistwidgetitem.html#QListWidgetItem-1

[schrute]

Thank you for pointing this out! I would have never figured it out that passing a parent widget to QListWidgetItem would automatically add it to the list.