QComboboxStrangeBehavior

#include <QApplication>
#include <QComboBox>
#include <QPushButton>
#include <QStringList>
#include <QStringListModel>
#include <QVBoxLayout>

#include <algorithm>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QStringList strings = { "aaa", "bbb", "ccc", "ddd" };
    //QStringListModel strings_model(strings);

    QStringList numbers = { "111", "222", "333", "444" };
    //QStringListModel numbers_model(numbers);

    QWidget main_widget;
    auto p_layout = new QVBoxLayout(&main_widget);

    auto p_combobox = new QComboBox(&main_widget);
    Q_ASSERT(p_combobox->model());
    //p_combobox->setModel(&strings_model);
    p_layout->addWidget(p_combobox);

    auto p_reverse_items_button = new QPushButton("Reverse order of items", &main_widget);
    p_layout->addWidget(p_reverse_items_button);
    bool is_current_strings = true;
    p_combobox->addItems(strings);
    Q_ASSERT(p_combobox->model()->rowCount() == 4);
    QObject::connect(p_reverse_items_button, &QAbstractButton::clicked, p_combobox, [&]
    {
        //auto p_current_model = qobject_cast<QStringListModel*>(p_combobox->model());
        //auto items = p_current_model->stringList();
        auto& items = is_current_strings ? strings : numbers;
        std::reverse(items.begin(), items.end());
        p_combobox->clear();
        p_combobox->addItems(items);
        //p_current_model->setStringList(items);
    });

    auto p_change_model_button = new QPushButton("Set another model", &main_widget);
    p_layout->addWidget(p_change_model_button);
    QObject::connect(p_change_model_button, &QAbstractButton::clicked, p_combobox, [&]
    {
        is_current_strings = !is_current_strings;
        auto& items = is_current_strings ? strings : numbers;
        p_combobox->clear();
        p_combobox->addItems(items);
        //auto p_current_model = qobject_cast<QStringListModel*>(p_combobox->model());
        //p_combobox->setModel(p_current_model == &strings_model ? &numbers_model : &strings_model);
    });


    main_widget.setLayout(p_layout);
    main_widget.show();

    return a.exec();
}