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diff --git a/include/svx/svdogrp.hxx b/include/svx/svdogrp.hxx
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+++ b/include/svx/svdogrp.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <memory>
+#include <svx/svdobj.hxx>
+#include <svx/svxdllapi.h>
+#include <svx/svdpage.hxx>
+
+//   SdrObjGroup
+class SVXCORE_DLLPUBLIC SdrObjGroup final : public SdrObject, public SdrObjList
+{
+public:
+    // Basic DiagramHelper support
+    virtual const std::shared_ptr< svx::diagram::IDiagramHelper >& getDiagramHelper() const override;
+
+private:
+    virtual std::unique_ptr<sdr::contact::ViewContact> CreateObjectSpecificViewContact() override;
+    virtual std::unique_ptr<sdr::properties::BaseProperties>
+    CreateObjectSpecificProperties() override;
+
+    Point maRefPoint; // Reference point inside the object group
+
+    // Allow *only* DiagramHelper itself to set this internal reference to
+    // tightly control usage
+    friend class svx::diagram::IDiagramHelper;
+    std::shared_ptr< svx::diagram::IDiagramHelper > mp_DiagramHelper;
+
+public:
+    SdrObjGroup(SdrModel& rSdrModel);
+    // Copy constructor
+    SdrObjGroup(SdrModel& rSdrModel, SdrObjGroup const& rSource);
+    virtual ~SdrObjGroup() override;
+
+    // derived from SdrObjList
+    virtual SdrPage* getSdrPageFromSdrObjList() const override;
+    virtual SdrObject* getSdrObjectFromSdrObjList() const override;
+
+    // derived from SdrObject
+    virtual SdrObjList* getChildrenOfSdrObject() const override;
+
+    virtual void SetBoundRectDirty() override;
+    virtual SdrObjKind GetObjIdentifier() const override;
+    virtual void TakeObjInfo(SdrObjTransformInfoRec& rInfo) const override;
+    virtual SdrLayerID GetLayer() const override;
+    virtual void NbcSetLayer(SdrLayerID nLayer) override;
+
+    // react on model/page change
+    virtual void handlePageChange(SdrPage* pOldPage, SdrPage* pNewPage) override;
+
+    virtual SdrObjList* GetSubList() const override;
+    virtual void SetGrabBagItem(const css::uno::Any& rVal) override;
+
+    virtual const tools::Rectangle& GetCurrentBoundRect() const override;
+    virtual const tools::Rectangle& GetSnapRect() const override;
+
+    virtual rtl::Reference<SdrObject> CloneSdrObject(SdrModel& rTargetModel) const override;
+
+    virtual OUString TakeObjNameSingul() const override;
+    virtual OUString TakeObjNamePlural() const override;
+
+    virtual void RecalcSnapRect() override;
+    virtual basegfx::B2DPolyPolygon TakeXorPoly() const override;
+
+    // special drag methods
+    virtual bool beginSpecialDrag(SdrDragStat& rDrag) const override;
+
+    virtual bool BegCreate(SdrDragStat& rStat) override;
+
+    virtual Degree100 GetRotateAngle() const override;
+    virtual Degree100 GetShearAngle(bool bVertical = false) const override;
+
+    virtual void Move(const Size& rSiz) override;
+    virtual void Resize(const Point& rRef, const Fraction& xFact, const Fraction& yFact,
+                        bool bUnsetRelative = true) override;
+    virtual void Rotate(const Point& rRef, Degree100 nAngle, double sn, double cs) override;
+    virtual void Mirror(const Point& rRef1, const Point& rRef2) override;
+    virtual void Shear(const Point& rRef, Degree100 nAngle, double tn, bool bVShear) override;
+    virtual void SetAnchorPos(const Point& rPnt) override;
+    virtual void SetRelativePos(const Point& rPnt) override;
+    virtual void SetSnapRect(const tools::Rectangle& rRect) override;
+    virtual void SetLogicRect(const tools::Rectangle& rRect) override;
+
+    virtual void NbcMove(const Size& rSiz) override;
+    virtual void NbcResize(const Point& rRef, const Fraction& xFact,
+                           const Fraction& yFact) override;
+    virtual void NbcRotate(const Point& rRef, Degree100 nAngle, double sn, double cs) override;
+    virtual void NbcMirror(const Point& rRef1, const Point& rRef2) override;
+    virtual void NbcShear(const Point& rRef, Degree100 nAngle, double tn, bool bVShear) override;
+    virtual void NbcSetAnchorPos(const Point& rPnt) override;
+    virtual void NbcSetRelativePos(const Point& rPnt) override;
+    virtual void NbcSetSnapRect(const tools::Rectangle& rRect) override;
+    virtual void NbcSetLogicRect(const tools::Rectangle& rRect) override;
+
+    virtual void NbcReformatText() override;
+
+    virtual rtl::Reference<SdrObject> DoConvertToPolyObj(bool bBezier,
+                                                         bool bAddText) const override;
+
+    virtual void dumpAsXml(xmlTextWriterPtr pWriter) const override;
+    virtual void AddToHdlList(SdrHdlList& rHdlList) const override;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */