crash while drag-and-drop if Qt::DecorationRole is used

#include "listmodel.h"
#include <QApplication>
#include <QListView>
#include <QMainWindow>

int main(int argc, char *argv[]) {
	QApplication app(argc, argv);
	QMainWindow *mainWindow = new QMainWindow;
	QListView *listView = new QListView;
	ListModel *listModel = new ListModel;
	listView->setSelectionMode(QAbstractItemView::ExtendedSelection);
	listView->setDragDropMode(QAbstractItemView::InternalMove);
	listModel->insertRows(0, 3);
	listModel->setData(listModel->index(0), "alpha", Qt::DisplayRole);
	listModel->setData(listModel->index(1), "beta", Qt::DisplayRole);
	listModel->setData(listModel->index(2), "gamma", Qt::DisplayRole);
	listView->setModel(listModel);
	mainWindow->setCentralWidget(listView);
	mainWindow->show();
	return app.exec();}

#ifndef LISTMODEL_H
#define LISTMODEL_H

#include <QtCore/QAbstractListModel>
#include <QtCore/QStringList>

class ListModel : public QAbstractListModel {
Q_OBJECT
public:
	explicit ListModel(QObject *parent = 0);
	QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
	Qt::ItemFlags flags(const QModelIndex &index) const;
	bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());
	bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
	int rowCount(const QModelIndex &parent = QModelIndex()) const;
	bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
	Qt::DropActions supportedDropActions() const;
private:
	QStringList items;};

#endif // LISTMODEL_H

#include "listmodel.h"
#include <QtWidgets/QApplication>
#include <QtWidgets/QStyle>

ListModel::ListModel(QObject *parent) : QAbstractListModel(parent) {}

QVariant ListModel::data(const QModelIndex &index, int role) const {
	QVariant result;
	if (index.row() > -1 && index.row() < items.size()) {
		if (role == Qt::DisplayRole || role == Qt::EditRole)
			result = items.at(index.row());
//		else if (role == Qt::DecorationRole)
//			result = qApp->style()->standardIcon(QStyle::SP_DirIcon);
	}
	return result;}

Qt::ItemFlags ListModel::flags(const QModelIndex &index) const {
	Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsDragEnabled | Qt::ItemIsEnabled;
	if (!index.isValid()) flags = flags | Qt::ItemIsDropEnabled;
	return flags;}

bool ListModel::insertRows(int row, int count, const QModelIndex &parent) {
	if (count < 1 || row < 0 || row > rowCount(parent))
		return false;
	beginInsertRows(QModelIndex(), row, row + count - 1);
	for (int i = 0; i < count; ++i)
		items.insert(row, QString());
	endInsertRows();
	return true;}

bool ListModel::removeRows(int row, int count, const QModelIndex &parent) {
	if (count < 1 || row < 0 || (row + count) > rowCount(parent))
		return false;
	beginRemoveRows(QModelIndex(), row, row + count - 1);
	for (int i = 0; i < count; ++i)
		items.removeAt(row);
	endRemoveRows();
	return true;}

int ListModel::rowCount(const QModelIndex &parent) const {
	if (parent.isValid()) return 0;
	return items.count();}

bool ListModel::setData(const QModelIndex &index, const QVariant &value, int role) {
	const int indexRow = index.row();
	if (indexRow > -1 && indexRow < items.count()) {
		if (role == Qt::DisplayRole || role == Qt::EditRole) {
			items.replace(indexRow, value.toString());
			emit dataChanged(index, index, QVector<int>() << role);
			return true;}}
	return false;}

Qt::DropActions ListModel::supportedDropActions() const {
	return Qt::MoveAction;}

CMAKE_MINIMUM_REQUIRED(VERSION 2.8.8)
PROJECT(crashtest)
set(CMAKE_AUTOMOC ON)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/modules/")
FIND_PACKAGE(Qt5Widgets REQUIRED)
SET(crashtest_SOURCES main.cpp listmodel.cpp)
ADD_EXECUTABLE(crashtest ${crashtest_SOURCES})
QT5_USE_MODULES(crashtest Widgets)