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diff --git a/src/assistant/help/qhelpengine_p.h b/src/assistant/help/qhelpengine_p.h
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the Qt Assistant of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** 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 https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://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 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QHELPENGINE_P_H
-#define QHELPENGINE_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API. It exists for the convenience
-// of the help generator tools. This header file may change from version
-// to version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include <QtCore/QHash>
-#include <QtCore/QMap>
-#include <QtCore/QStringList>
-#include <QtCore/QObject>
-
-QT_BEGIN_NAMESPACE
-
-class QSqlQuery;
-
-class QHelpEngineCore;
-class QHelpDBReader;
-class QHelpContentModel;
-class QHelpContentWidget;
-class QHelpIndexModel;
-class QHelpIndexWidget;
-class QHelpSearchEngine;
-class QHelpCollectionHandler;
-class QHelpFilterEngine;
-
-class QHelpEngineCorePrivate : public QObject
-{
-    Q_OBJECT
-
-public:
-    virtual ~QHelpEngineCorePrivate();
-
-    virtual void init(const QString &collectionFile,
-        QHelpEngineCore *helpEngineCore);
-
-    bool setup();
-
-    QHelpCollectionHandler *collectionHandler = nullptr;
-    QHelpFilterEngine *filterEngine = nullptr;
-    QString currentFilter;
-    QString error;
-    bool needsSetup = true;
-    bool autoSaveFilter = true;
-    bool usesFilterEngine = false;
-    bool readOnly = true;
-
-protected:
-    QHelpEngineCore *q;
-
-private slots:
-    void errorReceived(const QString &msg);
-};
-
-class QHelpEnginePrivate : public QHelpEngineCorePrivate
-{
-    Q_OBJECT
-
-public:
-    void init(const QString &collectionFile,
-        QHelpEngineCore *helpEngineCore) override;
-
-    QHelpContentModel *contentModel = nullptr;
-    QHelpContentWidget *contentWidget = nullptr;
-
-    QHelpIndexModel *indexModel = nullptr;
-    QHelpIndexWidget *indexWidget = nullptr;
-
-    QHelpSearchEngine *searchEngine = nullptr;
-
-    friend class QHelpContentProvider;
-    friend class QHelpContentModel;
-    friend class QHelpIndexProvider;
-    friend class QHelpIndexModel;
-
-public slots:
-    void setContentsWidgetBusy();
-    void unsetContentsWidgetBusy();
-    void setIndexWidgetBusy();
-    void unsetIndexWidgetBusy();
-
-private slots:
-    void scheduleApplyCurrentFilter();
-    void applyCurrentFilter();
-
-private:
-    bool m_isApplyCurrentFilterScheduled = false;
-
-};
-
-QT_END_NAMESPACE
-
-#endif