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diff --git a/sources/pyside2/doc/codesnippets/doc/src/snippets/persistentindexes/mainwindow.cpp b/sources/pyside2/doc/codesnippets/doc/src/snippets/persistentindexes/mainwindow.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of PySide2.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtWidgets>
+
+#include "mainwindow.h"
+#include "model.h"
+
+/*!
+    The main window constructor creates and populates a model with values
+    from a string list then displays the contents of the model using a
+    QListView widget.
+*/
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+{
+    QMenu *fileMenu = new QMenu(tr("&File"));
+
+    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
+    quitAction->setShortcut(tr("Ctrl+Q"));
+
+    QMenu *itemsMenu = new QMenu(tr("&Items"));
+
+    insertAction = itemsMenu->addAction(tr("&Insert Item"));
+    removeAction = itemsMenu->addAction(tr("&Remove Item"));
+
+    menuBar()->addMenu(fileMenu);
+    menuBar()->addMenu(itemsMenu);
+
+    QStringList numbers;
+    numbers << tr("One") << tr("Two") << tr("Three") << tr("Four") << tr("Five")
+            << tr("Six") << tr("Seven") << tr("Eight") << tr("Nine") << tr("Ten");
+
+    model = new StringListModel(numbers);
+    QListView *view = new QListView(this);
+    view->setModel(model);
+
+    selectionModel = view->selectionModel();
+
+    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
+    connect(insertAction, SIGNAL(triggered()), this, SLOT(insertItem()));
+    connect(removeAction, SIGNAL(triggered()), this, SLOT(removeItem()));
+    connect(selectionModel,
+            SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
+            this, SLOT(updateMenus(const QModelIndex &)));
+    
+    setCentralWidget(view);
+    setWindowTitle("View onto a string list model");
+}
+
+void MainWindow::insertItem()
+{
+    if (!selectionModel->currentIndex().isValid())
+        return;
+
+    QString itemText = QInputDialog::getText(this, tr("Insert Item"),
+        tr("Input text for the new item:"));
+
+    if (itemText.isNull())
+        return;
+
+    int row = selectionModel->currentIndex().row();
+
+    if (model->insertRows(row, 1))
+        model->setData(model->index(row, 0), itemText, Qt::EditRole);
+}
+
+void MainWindow::removeItem()
+{
+    if (!selectionModel->currentIndex().isValid())
+        return;
+
+    int row = selectionModel->currentIndex().row();
+
+    model->removeRows(row, 1);
+}
+
+void MainWindow::updateMenus(const QModelIndex &currentIndex)
+{
+    insertAction->setEnabled(currentIndex.isValid());
+    removeAction->setEnabled(currentIndex.isValid());
+}