QListView::dragMoveEvent should allow internal move ; QListView::dropEvent should not replace item

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include<QListView>

class ListView:public QListView
{
    Q_OBJECT

public:
    explicit ListView(QWidget *parent = nullptr): QListView(parent) {}

    virtual void dragMoveEvent(QDragMoveEvent *e)override
    {
        QAbstractItemView::dragMoveEvent(e);
    }

    virtual void dropEvent(QDropEvent *e)override
    {
        QAbstractItemView::dropEvent(e);
    }
};

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include<QSplitter>
#include<QPainter>
#include<QStandardItemModel>

template<typename T>
struct type_identity
{
    using type = T;
};
template<typename T>
using type_identity_t = typename type_identity<T>::type;

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    constexpr auto createQStandardItem=+[](int index)
    {
        QPixmap pixmap(32,32);
        pixmap.fill(Qt::GlobalColor::lightGray);
        {
            QPainter painter(&pixmap);
            painter.drawText(QRectF(0,0,32,32),Qt::AlignmentFlag::AlignCenter,QString::number(index));
        }
        QStandardItem*item=new QStandardItem(pixmap,QString::number(index));
        item->setFlags(item->flags()&~Qt::ItemFlag::ItemIsDropEnabled | Qt::ItemFlag::ItemIsDragEnabled);
        return item;
    };

    QStandardItemModel*model=new QStandardItemModel();
    model->invisibleRootItem()->setFlags(model->invisibleRootItem()->flags()&~Qt::ItemFlag::ItemIsDragEnabled | Qt::ItemFlag::ItemIsDropEnabled);
    for(int i=0;i!=7;++i)
    {
        model->appendRow(createQStandardItem(i));
    }

    QSplitter*splitter=new QSplitter(Qt::Orientation::Horizontal);
    this->setCentralWidget(splitter);

    for(int i=0;i!=4;++i)
    {
        QListView*listView=new ListView();
        listView->setModel(model);
        listView->setResizeMode(QListView::ResizeMode::Adjust);
        splitter->addWidget(listView);

        listView->setViewMode(type_identity_t<QListView::ViewMode[]>{QListView::ViewMode::ListMode,QListView::ViewMode::ListMode,QListView::ViewMode::IconMode,QListView::ViewMode::IconMode,}[i]);
        listView->setFlow(type_identity_t<QListView::Flow[]>{QListView::Flow::LeftToRight,QListView::Flow::TopToBottom,QListView::Flow::LeftToRight,QListView::Flow::TopToBottom,}[i]);

        listView->setDragDropMode(QAbstractItemView::DragDropMode::DragDrop);
        listView->setDefaultDropAction(Qt::DropAction::MoveAction);
        listView->setDropIndicatorShown(true);
        listView->setDragDropOverwriteMode(false);

        if(listView->viewMode()==QListView::ViewMode::IconMode)
        {
            listView->setMovement(QListView::Movement::Snap);
            listView->setGridSize({50,50});
        }

        //"dragEnabled and acceptsDrops are computed by QListView when calling setMovement() or setViewMode()"
        listView->setAcceptDrops(true);
        listView->setDragEnabled(true);
    }
}

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}