QItemDelegate calculates wrong sizeHint.

#ifndef WORDWRAP_TABLES_H
#define WORDWRAP_TABLES_H

#include <QtGui/QTableWidget>

class MyTableWidget : public QTableWidget
{
   Q_OBJECT
public:
   MyTableWidget();
public slots:
   void slotHorizontalHeaderResized(int,int,int);
};

#endif // WORDWRAP_TABLES_H

#include <QtGui/QApplication>
#include <QtGui/QHeaderView>
#include <QtGui/QItemDelegate>

#include "wordwrap_tables.h"


MyTableWidget::MyTableWidget()
{
   connect(horizontalHeader(), SIGNAL(sectionResized(int,int,int)), this, SLOT(slotHorizontalHeaderResized(int,int,int)));
   verticalHeader()->setResizeMode( QHeaderView::ResizeToContents );
}

void MyTableWidget::slotHorizontalHeaderResized( int /*logicalIndex*/, int /*oldSize*/, int /*newSize*/ )
{
   verticalHeader()->resizeSections(QHeaderView::ResizeToContents);
}

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

    MyTableWidget* tableWidget = new MyTableWidget();
    tableWidget->setItemDelegate( new QItemDelegate() ); 
    tableWidget->setRowCount(3);
    tableWidget->setColumnCount(3);

    QTableWidgetItem *newItem = new QTableWidgetItem( "Somewhat long test string" );
    tableWidget->setItem(0,0, newItem);

    tableWidget->show();
    return a.exec();
}