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diff --git a/src/assistant/help/qhelpfiltersettingswidget.h b/src/assistant/help/qhelpfiltersettingswidget.h
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+/****************************************************************************
+**
+** Copyright (C) 2020 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 QHELPFILTERSETTINGSWIDGET_H
+#define QHELPFILTERSETTINGSWIDGET_H
+
+#include <QtHelp/qhelp_global.h>
+
+#include <QtWidgets/qwidget.h>
+
+QT_BEGIN_NAMESPACE
+
+class QVersionNumber;
+
+class QHelpFilterEngine;
+class QHelpFilterSettingsWidgetPrivate;
+
+class QHELP_EXPORT QHelpFilterSettingsWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit QHelpFilterSettingsWidget(QWidget *parent = nullptr);
+
+    ~QHelpFilterSettingsWidget();
+
+    void setAvailableComponents(const QStringList &components);
+    void setAvailableVersions(const QList<QVersionNumber> &versions);
+
+    // TODO: filterEngine may be moved to c'tor or to setFilterEngine() setter
+    void readSettings(const QHelpFilterEngine *filterEngine);
+    bool applySettings(QHelpFilterEngine *filterEngine) const;
+
+private:
+    QScopedPointer<class QHelpFilterSettingsWidgetPrivate> d_ptr;
+    Q_DECLARE_PRIVATE(QHelpFilterSettingsWidget)
+    Q_DISABLE_COPY_MOVE(QHelpFilterSettingsWidget)
+};
+
+QT_END_NAMESPACE
+
+#endif // QHELPFILTERSETTINGSWIDGET_H