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diff --git a/include/editeng/outlobj.hxx b/include/editeng/outlobj.hxx
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+++ b/include/editeng/outlobj.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 .
+ */
+
+#ifndef INCLUDED_EDITENG_OUTLOBJ_HXX
+#define INCLUDED_EDITENG_OUTLOBJ_HXX
+
+#include <editeng/paragraphdata.hxx>
+#include <editeng/editengdllapi.h>
+#include <rtl/ustring.hxx>
+#include <svl/poolitem.hxx>
+#include <svl/style.hxx>
+#include <o3tl/cow_wrapper.hxx>
+#include <memory>
+
+class EditTextObject;
+enum class OutlinerMode;
+enum class TextRotation;
+
+/**
+ * This is the guts of OutlinerParaObject, refcounted and shared among
+ * multiple instances of OutlinerParaObject.
+ */
+struct OutlinerParaObjData
+{
+    // data members
+    std::unique_ptr<EditTextObject>  mpEditTextObject;
+    ParagraphDataVector              maParagraphDataVector;
+    bool                             mbIsEditDoc;
+
+    // constructor
+    OutlinerParaObjData( std::unique_ptr<EditTextObject> pEditTextObject, const ParagraphDataVector& rParagraphDataVector, bool bIsEditDoc );
+
+    OutlinerParaObjData( const OutlinerParaObjData& r );
+
+    OutlinerParaObjData( OutlinerParaObjData&& r ) = default;
+
+    // assignment operator
+    OutlinerParaObjData& operator=(const OutlinerParaObjData& rCandidate) = delete;
+
+    // destructor
+    ~OutlinerParaObjData();
+
+    bool operator==(const OutlinerParaObjData& rCandidate) const;
+
+    // #i102062#
+    bool isWrongListEqual(const OutlinerParaObjData& rCompare) const;
+};
+
+class EDITENG_DLLPUBLIC OutlinerParaObject
+{
+    ::o3tl::cow_wrapper< OutlinerParaObjData > mpImpl;
+
+public:
+    // constructors/destructor
+    OutlinerParaObject( const EditTextObject&, const ParagraphDataVector&, bool bIsEditDoc);
+    OutlinerParaObject( const EditTextObject&);
+    OutlinerParaObject( std::unique_ptr<EditTextObject> );
+    OutlinerParaObject( const OutlinerParaObject&);
+    ~OutlinerParaObject();
+
+    // assignment operator
+    OutlinerParaObject& operator=(const OutlinerParaObject& rCandidate);
+
+    // compare operator
+    bool operator==(const OutlinerParaObject& rCandidate) const;
+
+    // #i102062#
+    bool isWrongListEqual(const OutlinerParaObject& rCompare) const;
+
+    // outliner mode access
+    OutlinerMode GetOutlinerMode() const;
+    void SetOutlinerMode(OutlinerMode nNew);
+
+    // vertical access
+    bool IsVertical() const;
+    bool GetDirectVertical() const;
+    bool IsTopToBottom() const;
+    void SetVertical(bool bNew);
+    void SetRotation(TextRotation nRotation);
+    TextRotation GetRotation() const;
+
+    // data read access
+    sal_Int32 Count() const;
+    sal_Int16 GetDepth(sal_Int32 nPara) const;
+    const EditTextObject& GetTextObject() const;
+    const ParagraphData& GetParagraphData(sal_Int32 nIndex) const;
+
+    // portion info support
+    void ClearPortionInfo();
+
+    // StyleSheet support
+    bool ChangeStyleSheets(const OUString& rOldName, SfxStyleFamily eOldFamily,
+        const OUString& rNewName, SfxStyleFamily eNewFamily);
+    void ChangeStyleSheetName(SfxStyleFamily eFamily, const OUString& rOldName,
+        const OUString& rNewName);
+    void SetStyleSheets(sal_uInt16 nLevel, const OUString& rNewName,
+        const SfxStyleFamily& rNewFamily);
+
+    void dumpAsXml(xmlTextWriterPtr pWriter) const;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */