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diff --git a/src/lib/corelib/language/groupshandler.h b/src/lib/corelib/language/groupshandler.h
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+/****************************************************************************
+**
+** Copyright (C) 2023 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qbs.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#pragma once
+
+#include "qualifiedid.h"
+
+#include <tools/set.h>
+
+#include <unordered_map>
+#include <utility>
+
+namespace qbs {
+class SetupProjectParameters;
+namespace Internal {
+class Evaluator;
+class Item;
+class Logger;
+class ModuleInstantiator;
+
+// Sets up Group items for the actual resolving stage. Responsibilities:
+//   - Moving Group items located in modules over to the product.
+//   - Identifying groups declaring target artifacts and marking them accordingly.
+//   - Setting up group-level module instances to ensure proper resolving of per-group module
+//     properties.
+//   - As a side effect of the above point, collecting all properties set on the Group level
+//     to help the ProjectResolver decide which properties need to be re-evaluated at all,
+//     which is an important optimization (see commit 9cd8653eef).
+class GroupsHandler
+{
+public:
+    GroupsHandler(const SetupProjectParameters &parameters, ModuleInstantiator &instantiator,
+                  Evaluator &evaluator, Logger &logger);
+    ~GroupsHandler();
+
+    void setupGroups(Item *product, Item *productScope);
+    std::unordered_map<const Item *, QualifiedIdSet> modulePropertiesSetInGroups() const;
+    Set<Item *> disabledGroups() const;
+
+    void printProfilingInfo(int indent);
+
+private:
+    class Private;
+    Private * const d;
+};
+
+} // namespace Internal
+} // namespace qbs