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diff --git a/tests/manual/diaglib/logwidget.h b/tests/manual/diaglib/logwidget.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef LOGWIDGET_H
+#define LOGWIDGET_H
+
+#include <QPlainTextEdit>
+
+// Instantiate as follows: LogFunctionGuard guard(Q_FUNC_INFO)
+class LogFunctionGuard {
+    Q_DISABLE_COPY(LogFunctionGuard)
+public:
+    explicit LogFunctionGuard(const char *name);
+    ~LogFunctionGuard();
+
+private:
+    const char *m_name;
+};
+
+class LogWidget : public QPlainTextEdit
+{
+    Q_OBJECT
+public:
+    explicit LogWidget(QWidget *parent = 0);
+    ~LogWidget();
+
+    static LogWidget *instance() { return m_instance; }
+
+    static QString startupMessage();
+    static void install();
+    static void uninstall();
+
+    static int indent()          { return m_indent; }
+    static void setIndent(int i) { m_indent = i; }
+
+    static bool lineNumberingEnabled()          { return m_lineNumberingEnabled; }
+    static void setLineNumberingEnabled(bool l) { m_lineNumberingEnabled = l; }
+
+    static bool showMessageType()          { return m_showMessageType; }
+    static void setShowMessageType(bool s) { m_showMessageType = s; }
+
+public slots:
+    void appendText(const QString &);
+
+private:
+    static int m_indent;
+    static bool m_lineNumberingEnabled;
+    static bool m_showMessageType;
+    static LogWidget *m_instance;
+};
+
+inline LogFunctionGuard::LogFunctionGuard(const char *name) : m_name(name)
+{
+    qDebug(">%s", m_name);
+    LogWidget::setIndent(LogWidget::indent() + 2);
+}
+
+inline LogFunctionGuard::~LogFunctionGuard()
+{
+    LogWidget::setIndent(LogWidget::indent() - 2);
+    qDebug("<%s", m_name);
+}
+
+#endif // LOGWIDGET_H