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diff --git a/sw/inc/undobj.hxx b/sw/inc/undobj.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_SW_INC_UNDOBJ_HXX
+#define INCLUDED_SW_INC_UNDOBJ_HXX
+
+#include <vector>
+#include <memory>
+
+#include <svl/undo.hxx>
+#include "SwRewriter.hxx"
+#include "swundo.hxx"
+#include "nodeoffset.hxx"
+#include "ndindex.hxx"
+#include <o3tl/typed_flags_set.hxx>
+#include <optional>
+
+class SwHistory;
+class SwPaM;
+struct SwPosition;
+class SwDoc;
+class SwTextFormatColl;
+class SwFrameFormat;
+class SwFormatAnchor;
+class SwNode;
+class SwNodeRange;
+class SwRedlineData;
+class SwRedlineSaveDatas;
+enum class RedlineFlags;
+enum class RndStdIds;
+typedef struct _xmlTextWriter* xmlTextWriterPtr;
+
+namespace sw {
+    class UndoRedoContext;
+    class RepeatContext;
+}
+
+class SwUndo
+    : public SfxUndoAction
+{
+    SwUndoId const m_nId;
+    RedlineFlags   m_nOrigRedlineFlags;
+    ViewShellId    m_nViewShellId;
+    bool m_isRepeatIgnored; ///< for multi-selection, only repeat 1st selection
+
+protected:
+    bool m_bCacheComment;
+    mutable std::optional<OUString> maComment;
+
+    static void RemoveIdxFromSection( SwDoc&, SwNodeOffset nSttIdx, const SwNodeOffset* pEndIdx = nullptr );
+    static void RemoveIdxFromRange( SwPaM& rPam, bool bMoveNext );
+    static void RemoveIdxRel( SwNodeOffset, const SwPosition& );
+
+    static bool CanRedlineGroup( SwRedlineSaveDatas& rCurr,
+                                const SwRedlineSaveDatas& rCheck,
+                                bool bCurrIsEnd );
+
+    /**
+       Returns the rewriter for this object.
+
+       @return the rewriter for this object
+    */
+    virtual SwRewriter GetRewriter() const;
+
+    // the 4 methods that derived classes have to override
+    // base implementation does nothing
+    virtual void RepeatImpl( ::sw::RepeatContext & );
+public: // should not be public, but ran into trouble in untbl.cxx
+    virtual void UndoImpl( ::sw::UndoRedoContext & ) = 0;
+    virtual void RedoImpl( ::sw::UndoRedoContext & ) = 0;
+
+private:
+    /// Try to obtain the view shell ID of the current view.
+    static ViewShellId CreateViewShellId(const SwDoc* pDoc);
+    // SfxUndoAction
+    virtual void Undo() override;
+    virtual void Redo() override;
+    virtual void UndoWithContext(SfxUndoContext &) override;
+    virtual void RedoWithContext(SfxUndoContext &) override;
+    virtual void Repeat(SfxRepeatTarget &) override;
+    virtual bool CanRepeat(SfxRepeatTarget &) const override;
+
+public:
+    SwUndo(SwUndoId const nId, const SwDoc* pDoc);
+    virtual ~SwUndo() override;
+
+    SwUndoId GetId() const { return m_nId; }
+
+    /**
+       Returns textual comment for this undo object.
+
+       The textual comment is created from the resource string
+       corresponding to this object's ID. The rewriter of this object
+       is applied to the resource string to get the final comment.
+
+       @return textual comment for this undo object
+    */
+    virtual OUString GetComment() const override;
+
+    /// See SfxUndoAction::GetViewShellId().
+    ViewShellId GetViewShellId() const override;
+
+    // UndoObject remembers which mode was turned on.
+    // In Undo/Redo/Repeat this remembered mode is switched on.
+    RedlineFlags GetRedlineFlags() const { return m_nOrigRedlineFlags; }
+    void SetRedlineFlags( RedlineFlags eMode ) { m_nOrigRedlineFlags = eMode; }
+
+    bool IsDelBox() const;
+
+    // Save and set Redline data.
+    static bool FillSaveData( const SwPaM& rRange, SwRedlineSaveDatas& rSData,
+                              bool bDelRange = true, bool bCopyNext = true );
+    static bool FillSaveDataForFormat( const SwPaM& , SwRedlineSaveDatas& );
+    static void SetSaveData( SwDoc& rDoc, SwRedlineSaveDatas& rSData );
+    static bool HasHiddenRedlines( const SwRedlineSaveDatas& rSData );
+    void IgnoreRepeat() { m_isRepeatIgnored = true; }
+};
+
+enum class DelContentType : sal_uInt16
+{
+    Ftn          = 0x01,
+    Fly          = 0x02,
+    Bkm          = 0x08,
+    AllMask      = 0x0b,
+    Replace      = 0x10,
+    WriterfilterHack = 0x20,
+    ExcludeFlyAtStartEnd = 0x40,
+    CheckNoCntnt = 0x80,
+};
+namespace o3tl {
+    template<> struct typed_flags<DelContentType> : is_typed_flags<DelContentType, 0xfb> {};
+}
+
+/// will DelContentIndex destroy a frame anchored at character at rAnchorPos?
+bool IsDestroyFrameAnchoredAtChar(SwPosition const & rAnchorPos,
+        SwPosition const & rStart, SwPosition const & rEnd,
+        DelContentType const nDelContentType = DelContentType::AllMask);
+/// is a fly anchored at paragraph at rAnchorPos selected?
+bool IsSelectFrameAnchoredAtPara(SwPosition const & rAnchorPos,
+        SwPosition const & rStart, SwPosition const & rEnd,
+        DelContentType const nDelContentType = DelContentType::AllMask);
+/// check at-char and at-para flys in rDoc
+bool IsFlySelectedByCursor(SwDoc const & rDoc,
+        SwPosition const & rStart, SwPosition const & rEnd);
+
+// This class has to be inherited into an Undo-object if it saves content
+// for Redo/Undo...
+class SwUndoSaveContent
+{
+protected:
+
+    std::unique_ptr<SwHistory> m_pHistory;
+
+    // Needed for deletion of content. For Redo content is moved into the
+    // UndoNodesArray. These methods always create a new node to insert
+    // content. So the attributes do not get expanded.
+    // MoveTo:      moves from the NodesArray into the UndoNodesArray.
+    // MoveFrom:    moves from the UndoNodesArray into the NodesArray.
+    static void MoveToUndoNds( SwPaM& rPam,
+                        SwNodeIndex* pNodeIdx,
+                        SwNodeOffset* pEndNdIdx = nullptr );
+    static void MoveFromUndoNds( SwDoc& rDoc, SwNodeOffset nNodeIdx,
+                          SwPosition& rInsPos,
+                          const SwNodeOffset* pEndNdIdx = nullptr,
+                          bool bForceCreateFrames = false);
+
+    // These two methods save and restore the Point of PaM.
+    // If the point cannot be moved, a "backup" is created on the previous node.
+    // Either way, it will not be moved by inserting at its original position.
+    static ::std::optional<SwNodeIndex> MovePtBackward(SwPaM& rPam);
+    static void MovePtForward(SwPaM& rPam, ::std::optional<SwNodeIndex> && oMvBkwrd);
+
+    // Before moving stuff into UndoNodes-Array care has to be taken that
+    // the content-bearing attributes are removed from the nodes-array.
+    void DelContentIndex( const SwPosition& pMark, const SwPosition& pPoint,
+                        DelContentType nDelContentType = DelContentType::AllMask );
+
+public:
+    SwUndoSaveContent();
+    virtual ~SwUndoSaveContent() COVERITY_NOEXCEPT_FALSE;
+    virtual void dumpAsXml(xmlTextWriterPtr pWriter) const;
+};
+
+// Save a complete section in nodes-array.
+class SwUndoSaveSection : private SwUndoSaveContent
+{
+    std::optional<SwNodeIndex> m_oMovedStart;
+    std::unique_ptr<SwRedlineSaveDatas> m_pRedlineSaveData;
+    SwNodeOffset m_nMoveLen;           // Index into UndoNodes-Array.
+    SwNodeOffset m_nStartPos;
+
+protected:
+    const SwNodeIndex* GetMvSttIdx() const { return m_oMovedStart ? &*m_oMovedStart : nullptr; }
+    SwNodeOffset GetMvNodeCnt() const { return m_nMoveLen; }
+
+public:
+    SwUndoSaveSection();
+    ~SwUndoSaveSection();
+
+    void SaveSection( const SwNodeIndex& rSttIdx );
+    void SaveSection(const SwNodeRange& rRange, bool bExpandNodes = true);
+    void RestoreSection( SwDoc* pDoc, SwNodeIndex* pIdx, sal_uInt16 nSectType );
+    void RestoreSection(SwDoc* pDoc, const SwNode& rInsPos, bool bForceCreateFrames = false);
+
+    const SwHistory* GetHistory() const { return m_pHistory.get(); }
+          SwHistory* GetHistory()       { return m_pHistory.get(); }
+    virtual void dumpAsXml(xmlTextWriterPtr pWriter) const;
+};
+
+// This class saves the PaM as sal_uInt16's and is able to restore it
+// into a PaM.
+class SwUndRng
+{
+public:
+    SwNodeOffset m_nSttNode, m_nEndNode;
+    sal_Int32 m_nSttContent, m_nEndContent;
+
+    SwUndRng();
+    SwUndRng( const SwPaM& );
+
+    void SetValues( const SwPaM& rPam );
+    void SetPaM( SwPaM&, bool bCorrToContent = false ) const;
+    SwPaM & AddUndoRedoPaM(
+        ::sw::UndoRedoContext &, bool const bCorrToContent = false) const;
+};
+
+class SwUndoInsLayFormat;
+
+namespace sw {
+
+std::optional<std::vector<SwFrameFormat*>>
+GetFlysAnchoredAt(SwDoc & rDoc, SwNodeOffset nSttNode);
+
+}
+
+// base class for insertion of Document, Glossaries and Copy
+class SwUndoInserts : public SwUndo, public SwUndRng, private SwUndoSaveContent
+{
+    SwTextFormatColl *m_pTextFormatColl, *m_pLastNodeColl;
+    std::optional<std::vector<SwFrameFormat*>> m_pFrameFormats;
+    std::vector< std::shared_ptr<SwUndoInsLayFormat> > m_FlyUndos;
+    std::unique_ptr<SwRedlineData> m_pRedlineData;
+    SwNodeOffset m_nDeleteTextNodes;
+    SwNodeOffset m_nNodeDiff;
+    /// start of Content in UndoNodes for Redo
+    std::optional<SwNodeIndex> m_oUndoNodeIndex;
+    sal_uInt16 m_nSetPos;                 // Start in the history list.
+
+protected:
+    SwUndoInserts( SwUndoId nUndoId, const SwPaM& );
+public:
+    virtual ~SwUndoInserts() override;
+
+    virtual void UndoImpl( ::sw::UndoRedoContext & ) override;
+    virtual void RedoImpl( ::sw::UndoRedoContext & ) override;
+    virtual void RepeatImpl( ::sw::RepeatContext & ) override;
+
+    // Set destination range after reading.
+    void SetInsertRange( const SwPaM&, bool bScanFlys = true,
+                         SwNodeOffset nDeleteTextNodes = SwNodeOffset(1));
+
+    static bool IsCreateUndoForNewFly(SwFormatAnchor const& rAnchor,
+        SwNodeOffset const nStartNode, SwNodeOffset const nEndNode);
+    std::vector<SwFrameFormat*> * GetFlysAnchoredAt() { return m_pFrameFormats ? &*m_pFrameFormats : nullptr; }
+
+    void dumpAsXml(xmlTextWriterPtr pWriter) const override;
+};
+
+/// Undo for Insert -> Text from file.
+class SwUndoInsDoc final : public SwUndoInserts
+{
+public:
+    SwUndoInsDoc( const SwPaM& );
+};
+
+class SwUndoCpyDoc final : public SwUndoInserts
+{
+public:
+    SwUndoCpyDoc( const SwPaM& );
+};
+
+class SwUndoFlyBase : public SwUndo, private SwUndoSaveSection
+{
+protected:
+    SwFrameFormat* m_pFrameFormat;          // The saved FlyFormat.
+    SwNodeOffset m_nNodePagePos;
+    sal_Int32 m_nContentPos;         // Page at/in paragraph.
+    RndStdIds m_nRndId;
+    bool m_bDelFormat;           // Delete saved format.
+
+    void InsFly(::sw::UndoRedoContext & rContext, bool bShowSel = true);
+    void DelFly( SwDoc* );
+
+    SwUndoFlyBase( SwFrameFormat* pFormat, SwUndoId nUndoId );
+
+    const SwNodeIndex* GetMvSttIdx() const { return SwUndoSaveSection::GetMvSttIdx(); }
+    SwNodeOffset GetMvNodeCnt() const { return SwUndoSaveSection::GetMvNodeCnt(); }
+
+public:
+    virtual ~SwUndoFlyBase() override;
+    void dumpAsXml(xmlTextWriterPtr pWriter) const override;
+
+};
+
+class SwUndoInsLayFormat final : public SwUndoFlyBase
+{
+    SwNodeOffset mnCursorSaveIndexPara;        // Cursor position
+    sal_Int32 mnCursorSaveIndexPos;            // for undo
+public:
+    SwUndoInsLayFormat( SwFrameFormat* pFormat, SwNodeOffset nNodeIdx, sal_Int32 nCntIdx );
+
+    virtual ~SwUndoInsLayFormat() override;
+
+    virtual void UndoImpl( ::sw::UndoRedoContext & ) override;
+    virtual void RedoImpl( ::sw::UndoRedoContext & ) override;
+    virtual void RepeatImpl( ::sw::RepeatContext & ) override;
+
+    virtual OUString GetComment() const override;
+
+};
+
+class SwUndoDelLayFormat final : public SwUndoFlyBase
+{
+    bool m_bShowSelFrame;
+public:
+    SwUndoDelLayFormat( SwFrameFormat* pFormat );
+
+    virtual void UndoImpl( ::sw::UndoRedoContext & ) override;
+    virtual void RedoImpl( ::sw::UndoRedoContext & ) override;
+
+    void RedoForRollback();
+
+    void ChgShowSel( bool bNew ) { m_bShowSelFrame = bNew; }
+
+    virtual SwRewriter GetRewriter() const override;
+
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */