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diff --git a/sw/source/core/inc/flowfrm.hxx b/sw/source/core/inc/flowfrm.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_SOURCE_CORE_INC_FLOWFRM_HXX
+#define INCLUDED_SW_SOURCE_CORE_INC_FLOWFRM_HXX
+
+#include "frame.hxx"
+#include "layfrm.hxx"
+#include <swtypes.hxx>
+
+class SvxFormatKeepItem;
+class SvxFormatBreakItem;
+class SwPageFrame;
+class SwRect;
+class SwBorderAttrs;
+class SwDoc;
+class SwNodeIndex;
+
+/** Base class that provides the general functionalities for frames that are
+    allowed at page breaks (flow) and shall continue on the next page (can be
+    split), e.g. paragraphs (ContentFrame) or tables (TabFrame).
+
+    Some parts of these functionalities are implemented in FlowFrame while the
+    specific ones are done in the corresponding Frame classes. The FlowFrame has to
+    be seen as a base class. As such it is no Frame by itself and thus no direct
+    instances of FlowFrame can exist.
+
+    Actually it is not even a real Frame. The obvious implementation would be a
+    FlowFrame that is virtually inherited from SwFrame and that works with its own
+    member data. Further classes would need to inherit from FlowFrame and (via
+    multiple base classes since the class tree splits exactly at the branch
+    from SwFrame to SwContentFrame and SwLayoutFrame) also virtually from SwFrame as
+    well. Unfortunately, this leads - besides problems with compilers and
+    debugging programs - to high additional costs, that we IMHO are not able to
+    afford nowadays.
+
+    Hence, we use another technique: A FlowFrame keeps a reference to a SwFrame
+    - which it is actually itself - and they are friends. As a result, the
+    FlowFrame can work with the reference to the SwFrame instead of working with
+    its own this-pointer.
+ */
+class SwFlowFrame
+{
+    // PrepareMake is allowed to lock/unlock (robustness)
+    friend inline void PrepareLock  ( SwFlowFrame * );
+    friend inline void PrepareUnlock( SwFlowFrame * );
+    friend inline void TableSplitRecalcLock( SwFlowFrame * );
+    friend inline void TableSplitRecalcUnlock( SwFlowFrame * );
+    // #i44049#
+    friend class SwObjectFormatterTextFrame;
+    friend class FlowFrameJoinLockGuard;
+
+    // TableSel is allowed to reset the follow-bit
+    friend inline void UnsetFollow( SwFlowFrame *pFlow );
+
+    friend void MakeFrames( SwDoc *, const SwNodeIndex &, const SwNodeIndex & );
+
+    friend class SwNode2LayImpl;
+
+    SwFrame& m_rThis;
+
+    // helper methods for MoveSubTree()
+    static SwLayoutFrame *CutTree( SwFrame* );
+    static bool         PasteTree( SwFrame *, SwLayoutFrame *, SwFrame *, SwFrame* );
+
+    /** indicates that a backward move was done over multiple pages
+
+        Needed for the interaction of _GetPrevxxx and MoveBwd so that multiple
+        pages can be skipped at the same time. In addition, it is evaluated by
+        the MoveBwd() method in TabFrame.
+    */
+    static bool m_bMoveBwdJump;
+
+    /** helper method to determine previous frame for calculation of the
+        upper space
+
+        #i11860#
+
+        @param _pProposedPrevFrame
+        optional input parameter - pointer to frame, which should be used
+        instead of the direct previous frame.
+    */
+    const SwFrame* GetPrevFrameForUpperSpaceCalc_( const SwFrame* _pProposedPrevFrame = nullptr ) const;
+
+    /** method to determine the upper space amount, which is considered for
+        the previous frame
+
+        #i11860#
+    */
+    SwTwips GetUpperSpaceAmountConsideredForPrevFrame() const;
+
+    /** method to determine the upper space amount, which is considered for
+        the page grid
+
+        #i11860#
+    */
+    SwTwips GetUpperSpaceAmountConsideredForPageGrid_(
+                                const SwTwips _nUpperSpaceWithoutGrid ) const;
+
+protected:
+    SwFlowFrame *m_pFollow;
+    SwFlowFrame *m_pPrecede;
+
+    bool m_bLockJoin  :1; // if true than joins (and thus deletes) are prohibited!
+    bool m_bUndersized:1; // I am smaller than needed
+    bool m_bFlyLock   :1; // stop positioning of at-character flyframes
+
+    // checks if forward flow makes sense to prevent infinite moves
+    inline bool IsFwdMoveAllowed() const;
+    // #i44049# - method <CalcContent(..)> has to check this property.
+    friend void CalcContent( SwLayoutFrame *pLay, bool bNoColl );
+    bool IsKeepFwdMoveAllowed( bool bIgnoreMyOwnKeepValue = false );    // like above, forward flow for Keep.
+
+    /** method to determine overlapping of an object that requests floating
+
+        0: no overlapping
+        1: objects that are anchored at the FlowFrame overlap
+        2: objects that are anchored somewhere else overlap
+        3: both types of objects overlap
+    */
+    sal_uInt8 BwdMoveNecessary( const SwPageFrame *pPage, const SwRect &rRect );
+
+    void LockJoin()   { m_bLockJoin = true;  }
+    void UnlockJoin() { m_bLockJoin = false; }
+
+    bool CheckMoveFwd( bool& rbMakePage, bool bKeep, bool bIgnoreMyOwnKeepValue );
+    bool MoveFwd( bool bMakePage, bool bPageBreak, bool bMoveAlways = false );
+    bool MoveBwd( bool &rbReformat );
+    virtual bool ShouldBwdMoved( SwLayoutFrame *pNewUpper, bool &rReformat )=0;
+
+public:
+    SwFlowFrame( SwFrame &rFrame );
+    virtual ~SwFlowFrame();
+
+    const SwFrame& GetFrame() const { return m_rThis; }
+          SwFrame& GetFrame()       { return m_rThis; }
+
+    static bool IsMoveBwdJump() { return m_bMoveBwdJump; }
+    static void SetMoveBwdJump( bool bNew ){ m_bMoveBwdJump = bNew; }
+
+    void SetUndersized( const bool bNew ) { m_bUndersized = bNew; }
+    bool IsUndersized()  const { return m_bUndersized; }
+
+    bool IsPrevObjMove() const;
+
+    /** hook tree onto new parent with minimal operations and notifications */
+    void MoveSubTree( SwLayoutFrame* pParent, SwFrame* pSibling = nullptr );
+
+    bool HasFollow() const { return m_pFollow != nullptr; }
+    bool IsFollow() const { return nullptr != m_pPrecede; }
+    bool IsAnFollow( const SwFlowFrame *pFlow ) const;
+    const SwFlowFrame *GetFollow() const { return m_pFollow; }
+          SwFlowFrame *GetFollow()       { return m_pFollow; }
+    void SetFollow(SwFlowFrame *const pFollow);
+
+    const SwFlowFrame *GetPrecede() const { return m_pPrecede; }
+          SwFlowFrame *GetPrecede()       { return m_pPrecede; }
+
+    bool IsJoinLocked() const { return m_bLockJoin; }
+    bool IsAnyJoinLocked() const { return m_bLockJoin || HasLockedFollow(); }
+
+    bool IsPageBreak( bool bAct ) const;
+    bool IsColBreak( bool bAct ) const;
+
+    /** method to determine if a Keep needs to be considered (Breaks!) */
+    bool IsKeep(SvxFormatKeepItem const& rKeep,
+                SvxFormatBreakItem const& rBreak,
+                bool bBreakCheck = false ) const;
+
+    bool HasLockedFollow() const;
+
+    bool HasParaSpaceAtPages( bool bSct ) const;
+
+    /** method to determine the upper space hold by the frame
+
+        #i11860#
+
+        @param _bConsiderGrid
+        optional input parameter - consider the page grid while calculating?
+    */
+    SwTwips CalcUpperSpace( const SwBorderAttrs *pAttrs = nullptr,
+                            const SwFrame* pPr = nullptr,
+                            const bool _bConsiderGrid = true ) const;
+
+    /** method to determine the upper space amount, which is considered for
+        the previous frame and the page grid, if option 'Use former object
+        positioning' is OFF
+
+        #i11860#
+    */
+    SwTwips GetUpperSpaceAmountConsideredForPrevFrameAndPageGrid() const;
+
+    /** calculation of lower space */
+    SwTwips CalcLowerSpace( const SwBorderAttrs* _pAttrs = nullptr ) const;
+
+    /** calculation of the additional space to be considered, if flow frame
+        is the last inside a table cell
+
+        #i26250
+
+        @param _pAttrs
+        optional input parameter - border attributes of the flow frame.
+        Used for optimization, if caller has already determined the border
+        attributes.
+
+        @return SwTwips
+    */
+    SwTwips CalcAddLowerSpaceAsLastInTableCell(
+                                    const SwBorderAttrs* _pAttrs = nullptr ) const;
+
+    void CheckKeep();
+
+    void SetFlyLock( bool bNew ){ m_bFlyLock = bNew; }
+    bool IsFlyLock() const {    return m_bFlyLock; }
+
+    bool ForbiddenForFootnoteCntFwd() const;
+
+    // Casting of a Frame into a FlowFrame (if it is one, otherwise 0)
+    // These methods need to be customized in subclasses!
+    static       SwFlowFrame *CastFlowFrame( SwFrame *pFrame );
+    static const SwFlowFrame *CastFlowFrame( const SwFrame *pFrame );
+};
+
+inline bool SwFlowFrame::IsFwdMoveAllowed() const
+{
+    return m_rThis.GetIndPrev() != nullptr;
+}
+
+//use this to protect a SwLayoutFrame for a given scope from getting merged with
+//its neighbour and thus deleted
+class FlowFrameJoinLockGuard
+{
+private:
+    SwFlowFrame *m_pFlow;
+    bool m_bOldJoinLocked;
+public:
+    //JoinLock pParent for the lifetime of the Cut/Paste call, etc. to avoid
+    //SwSectionFrame::MergeNext removing the pParent we're trying to reparent
+    //into
+    FlowFrameJoinLockGuard(SwLayoutFrame* pFrame)
+    {
+        m_pFlow = SwFlowFrame::CastFlowFrame(pFrame);
+        if (m_pFlow)
+        {
+            m_bOldJoinLocked = m_pFlow->IsJoinLocked();
+            m_pFlow->LockJoin();
+        }
+        else
+        {
+            m_bOldJoinLocked = false;
+        }
+    }
+
+    ~FlowFrameJoinLockGuard()
+    {
+        if (m_pFlow && !m_bOldJoinLocked)
+            m_pFlow->UnlockJoin();
+    }
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */