resizeToContents sometimes slightly to small

#include <QtGui/QApplication>
#include <QMainWindow>
#include <QAbstractTableModel>
#include <QList>
#include <QString>
#include <QResizeEvent>
#include "ui_mainwindow.h"

class MyModel : public QAbstractTableModel {
    Q_OBJECT
    QList<QString> items;
public:
    MyModel(QWidget* parent = 0) : QAbstractTableModel(parent) {
        items.append("The less you know about computers the more you want Microsoft! -- Microsoft ad campaign, circa 1996");
    }
    int rowCount(const QModelIndex& /*parent = QModelIndex()*/) const { return 1; }
    int columnCount(const QModelIndex& /*parent = QModelIndex()*/) const { return items.size(); }
    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const {
        if (role == Qt::DisplayRole) return items[index.column()];
        if (role == Qt::DecorationRole) return QIcon::fromTheme(QLatin1String("dialog-information"));
        else return QVariant();
    }
};

namespace Ui { class MainWindow; }
class MainWindow : public QMainWindow {
    Q_OBJECT
    Ui::MainWindow* ui;
public:
    MainWindow(QWidget* parent = 0) : QMainWindow(parent), ui(new Ui::MainWindow) {
        ui->setupUi(this);
        ui->tableView->setModel(new MyModel(this));
        ui->tableView->horizontalHeader()->setResizeMode(QHeaderView::Stretch);
        ui->tableView->verticalHeader()->setResizeMode(QHeaderView::ResizeToContents);
        ui->tableView->resizeRowsToContents();
        ui->tableView->verticalHeader()->setVisible(false);
    }
    ~MainWindow() { delete ui; }
};

#include "main.moc" // required due to single-file

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

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class&gt;MainWindow</class&gt;
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>264</width>
    <height>200</height>
   </rect>
  </property>
  <widget class="QWidget" name="centralWidget">
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
     <widget class="QTableView" name="tableView"/>
    </item>
   </layout>
  </widget>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

QT       += core gui
TARGET    = QtTest
TEMPLATE  = app
SOURCES  += main.cpp
FORMS    += mainwindow.ui