Long live Qt 4.5!

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diff --git a/demos/undo/mainwindow.h b/demos/undo/mainwindow.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include "ui_mainwindow.h"
+
+class Document;
+
+class MainWindow : public QMainWindow, public Ui::MainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = 0);
+
+    void addDocument(Document *doc);
+    void removeDocument(Document *doc);
+    void setCurrentDocument(Document *doc);
+    Document *currentDocument() const;
+
+public slots:
+    void openDocument();
+    void saveDocument();
+    void closeDocument();
+    void newDocument();
+
+    void addShape();
+    void removeShape();
+    void setShapeColor();
+
+    void addSnowman();
+    void addRobot();
+
+    void about();
+    void aboutQt();
+
+private slots:
+    void updateActions();
+
+private:
+    QUndoGroup *m_undoGroup;
+
+    QString fixedWindowTitle(const Document *doc) const;
+};
+
+#endif // MAINWINDOW_H