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diff --git a/sw/inc/tblsel.hxx b/sw/inc/tblsel.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_TBLSEL_HXX
+#define INCLUDED_SW_INC_TBLSEL_HXX
+
+#include "swtable.hxx"
+#include "swrect.hxx"
+#include "swdllapi.h"
+
+#include <o3tl/sorted_vector.hxx>
+
+#include <memory>
+#include <deque>
+#include <vector>
+
+class SwCursorShell;
+class SwCursor;
+class SwTableCursor;
+class SwFrame;
+class SwTabFrame;
+class SwLayoutFrame;
+class SwPaM;
+class SwNode;
+class SwUndoTableMerge;
+class SwCellFrame;
+
+typedef std::deque< SwCellFrame* > SwCellFrames;
+
+struct CompareSwSelBoxes
+{
+    bool operator()(SwTableBox* const& lhs, SwTableBox* const& rhs) const
+    {
+        return lhs->GetSttIdx() < rhs->GetSttIdx();
+    }
+};
+class SwSelBoxes : public o3tl::sorted_vector<SwTableBox*, CompareSwSelBoxes> {};
+
+// Collects all boxes in table that are selected.
+// Selection gets extended in given direction according to enum-parameter.
+// Boxes are collected via the Layout; works correctly if tables are split.
+// (Cf. MakeSelUnions().)
+enum class SwTableSearchType : sal_uInt16
+{
+    NONE           = 0x01, // No extension.
+    Row            = 0x02, // Extend to rows.
+    Col            = 0x03, // Extend to columns.
+
+    // As flags to the other values!
+    Protect        = 0x08, // Collect protected boxes too.
+    NoUnionCorrect = 0x10, // Do not correct collected Union.
+};
+namespace o3tl {
+    template<> struct typed_flags<SwTableSearchType> : is_typed_flags<SwTableSearchType, 0x1b> {};
+}
+
+SW_DLLPUBLIC void GetTableSel( const SwCursorShell& rShell, SwSelBoxes& rBoxes,
+                const SwTableSearchType = SwTableSearchType::NONE );
+
+void GetTableSel( const SwCursor& rCursor, SwSelBoxes& rBoxes,
+                const SwTableSearchType = SwTableSearchType::NONE );
+
+// As before, but don't start from selection but from Start- EndFrames.
+void GetTableSel( const SwLayoutFrame* pStart, const SwLayoutFrame* pEnd,
+                SwSelBoxes& rBoxes, SwCellFrames* pCells,
+                const SwTableSearchType = SwTableSearchType::NONE );
+
+// As before but directly via PaMs.
+void GetTableSelCrs( const SwCursorShell& rShell, SwSelBoxes& rBoxes );
+void GetTableSelCrs( const SwTableCursor& rTableCursor, SwSelBoxes& rBoxes );
+
+// Collect boxes relevant for auto sum.
+bool GetAutoSumSel( const SwCursorShell&, SwCellFrames& );
+
+// Check if the SelBoxes contains protected Boxes.
+bool HasProtectedCells( const SwSelBoxes& rBoxes );
+
+// Check if selection is balanced.
+bool ChkChartSel( const SwNode& rSttNd, const SwNode& rEndNd);
+
+// Check if cell is part of SSelection.
+// (Became a function, in order to make sure that GetTableSel() and MakeTableCursor()
+// have always the same concept of the selection.
+bool IsFrameInTableSel( const SwRect& rUnion, const SwFrame* pCell );
+
+// Determine boxes to be merged.
+// In this process the rectangle gets "adapted" on the base of the layout,
+// i.e. boxes are added if some overlap at the sides.
+// Additionally a new box is created and filled with the relevant content.
+void GetMergeSel( const SwPaM& rPam, SwSelBoxes& rBoxes,
+                  SwTableBox** ppMergeBox, SwUndoTableMerge* pUndo );
+
+// Check if selected boxes allow for a valid merge.
+TableMergeErr CheckMergeSel( const SwPaM& rPam );
+TableMergeErr CheckMergeSel( const SwSelBoxes& rBoxes );
+
+bool IsEmptyBox( const SwTableBox& rBox, SwPaM& rPam );
+
+// Check if Split or InsertCol lead to a box becoming smaller than MINLAY.
+bool CheckSplitCells( const SwCursorShell& rShell, sal_uInt16 nDiv,
+                        const SwTableSearchType );
+bool CheckSplitCells( const SwCursor& rCursor, sal_uInt16 nDiv,
+                        const SwTableSearchType );
+
+// For working on tab selection also for split tables.
+class SwSelUnion
+{
+    SwRect   m_aUnion;        // The rectangle enclosing the selection.
+    SwTabFrame *m_pTable;       // The (Follow-)Table for the Union.
+
+public:
+    SwSelUnion( const SwRect &rRect, SwTabFrame *pTab ) :
+        m_aUnion( rRect ), m_pTable( pTab ) {}
+
+    const SwRect&   GetUnion() const { return m_aUnion; }
+          SwRect&   GetUnion()       { return m_aUnion; }
+    const SwTabFrame *GetTable() const { return m_pTable; }
+          SwTabFrame *GetTable()       { return m_pTable; }
+};
+
+// Determines tables affected by a table selection and union rectangles
+// of the selection (also for split tables)
+typedef std::vector<SwSelUnion> SwSelUnions;
+
+// Gets the tables involved in a table selection and the union-rectangles of the selections
+// - also for split tables.
+// If a parameter is passed that != SwTableSearchType::NONE
+// the selection is extended in the given direction.
+void MakeSelUnions( SwSelUnions&, const SwLayoutFrame *pStart,
+                    const SwLayoutFrame *pEnd,
+                    const SwTableSearchType = SwTableSearchType::NONE );
+
+// These classes copy the current table selections (rBoxes) into a
+// separate structure while keeping the table structure.
+
+class FndBox_;
+class FndLine_;
+
+typedef std::vector<std::unique_ptr<FndBox_>> FndBoxes_t;
+typedef std::vector<std::unique_ptr<FndLine_>> FndLines_t;
+
+class FndBox_
+{
+    SwTableBox* m_pBox;
+    FndLines_t m_Lines;
+    FndLine_* m_pUpper;
+
+    SwTableLine *m_pLineBefore; ///< For deleting/restoring the layout.
+    SwTableLine *m_pLineBehind; ///< For deleting/restoring the layout.
+
+    FndBox_(FndBox_ const&) = delete;
+    FndBox_& operator=(FndBox_ const&) = delete;
+
+public:
+    FndBox_( SwTableBox* pB, FndLine_* pFL ) :
+        m_pBox(pB), m_pUpper(pFL), m_pLineBefore( nullptr ), m_pLineBehind( nullptr ) {}
+
+    const FndLines_t&   GetLines() const    { return m_Lines; }
+        FndLines_t&     GetLines()          { return m_Lines; }
+    const SwTableBox*   GetBox() const      { return m_pBox; }
+        SwTableBox*     GetBox()            { return m_pBox; }
+    const FndLine_*     GetUpper() const    { return m_pUpper; }
+        FndLine_*       GetUpper()          { return m_pUpper; }
+
+    void SetTableLines( const SwSelBoxes &rBoxes, const SwTable &rTable );
+    void SetTableLines( const SwTable &rTable );
+    //Add an input param to identify if acc table should be disposed
+    void DelFrames ( SwTable &rTable );
+    void MakeFrames( SwTable &rTable );
+    void MakeNewFrames( SwTable &rTable, const sal_uInt16 nNumber,
+                                       const bool bBehind );
+    bool AreLinesToRestore( const SwTable &rTable ) const;
+
+    void ClearLineBehind() { m_pLineBehind = nullptr; }
+};
+
+class FndLine_
+{
+    SwTableLine* m_pLine;
+    FndBoxes_t m_Boxes;
+    FndBox_* m_pUpper;
+
+    FndLine_(FndLine_ const&) = delete;
+    FndLine_& operator=(FndLine_ const&) = delete;
+
+public:
+    FndLine_(SwTableLine* pL, FndBox_* pFB) : m_pLine(pL), m_pUpper(pFB) {}
+    const FndBoxes_t&   GetBoxes() const    { return m_Boxes; }
+        FndBoxes_t&     GetBoxes()          { return m_Boxes; }
+    const SwTableLine*  GetLine() const     { return m_pLine; }
+        SwTableLine*    GetLine()           { return m_pLine; }
+    const FndBox_*      GetUpper() const    { return m_pUpper; }
+        FndBox_*        GetUpper()          { return m_pUpper; }
+
+    void SetUpper( FndBox_* pUp ) { m_pUpper = pUp; }
+};
+
+struct FndPara
+{
+    const SwSelBoxes& rBoxes;
+    FndLine_* pFndLine;
+    FndBox_* pFndBox;
+
+    FndPara( const SwSelBoxes& rBxs, FndBox_* pFB )
+        : rBoxes(rBxs), pFndLine(nullptr), pFndBox(pFB) {}
+    FndPara( const FndPara& rPara, FndBox_* pFB )
+        : rBoxes(rPara.rBoxes), pFndLine(rPara.pFndLine), pFndBox(pFB) {}
+    FndPara( const FndPara& rPara, FndLine_* pFL )
+        : rBoxes(rPara.rBoxes), pFndLine(pFL), pFndBox(rPara.pFndBox) {}
+};
+
+/** This creates a structure mirroring the SwTable structure that contains all
+    rows and non-leaf boxes (as pointers to SwTableBox/SwTableLine, not copies),
+    plus the leaf boxes that are selected by pFndPara->rBoxes
+ */
+SW_DLLPUBLIC void ForEach_FndLineCopyCol(SwTableLines& rLines, FndPara* pFndPara );
+
+#endif // INCLUDED_SW_INC_TBLSEL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */