sectfrm.cxx

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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 .
 */

#include <config_wasm_strip.h>

#include <sal/config.h>
#include <sal/log.hxx>

#include <o3tl/safeint.hxx>
#include <osl/diagnose.h>
#include <svl/itemiter.hxx>
#include <txtftn.hxx>
#include <fmtftn.hxx>
#include <fmtclbl.hxx>
#include <sectfrm.hxx>
#include <cellfrm.hxx>
#include <section.hxx>
#include <IDocumentSettingAccess.hxx>
#include <rootfrm.hxx>
#include <pagefrm.hxx>
#include <txtfrm.hxx>
#include <fmtclds.hxx>
#include <colfrm.hxx>
#include <tabfrm.hxx>
#include <ftnfrm.hxx>
#include <layouter.hxx>
#include <dbg_lay.hxx>
#include <viewopt.hxx>
#include <viewimp.hxx>
#include <editeng/brushitem.hxx>
#include <fmtftntx.hxx>
#include <flyfrm.hxx>
#include <sortedobjs.hxx>
#include <hints.hxx>
#include <frmatr.hxx>
#include <frmtool.hxx>

namespace
{
void InvalidateFramePos(SwFrame* pFrame, bool bInCalcContent)
{
    if (bInCalcContent)
        pFrame->InvalidatePos_();
    else
        pFrame->InvalidatePos();
}
}

SwSectionFrame::SwSectionFrame( SwSection &rSect, SwFrame* pSib )
    : SwLayoutFrame( rSect.GetFormat(), pSib )
    , SwFlowFrame( static_cast<SwFrame&>(*this) )
    , m_pSection( &rSect )
    , m_bFootnoteAtEnd(false)
    , m_bEndnAtEnd(false)
    , m_bContentLock(false)
    , m_bOwnFootnoteNum(false)
    , m_bFootnoteLock(false)
{
    StartListening(rSect.GetFormat()->GetNotifier());

    mnFrameType = SwFrameType::Section;

    CalcFootnoteAtEndFlag();
    CalcEndAtEndFlag();
}

SwSectionFrame::SwSectionFrame( SwSectionFrame &rSect, bool bMaster ) :
    SwLayoutFrame( rSect.GetFormat(), rSect.getRootFrame() ),
    SwFlowFrame( static_cast<SwFrame&>(*this) ),
    m_pSection( rSect.GetSection() ),
    m_bFootnoteAtEnd( rSect.IsFootnoteAtEnd() ),
    m_bEndnAtEnd( rSect.IsEndnAtEnd() ),
    m_bContentLock( false ),
    m_bOwnFootnoteNum( false ),
    m_bFootnoteLock( false )
{
    StartListening(rSect.GetFormat()->GetNotifier());

    mnFrameType = SwFrameType::Section;

    PROTOCOL( this, PROT::Section, bMaster ? DbgAction::CreateMaster : DbgAction::CreateFollow, &rSect )

    if( bMaster )
    {
        SwSectionFrame* pMaster = rSect.IsFollow() ? rSect.FindMaster() : nullptr;
        if (pMaster)
            pMaster->SetFollow( this );
        SetFollow( &rSect );
    }
    else
    {
        SetFollow( rSect.GetFollow() );
        rSect.SetFollow( this );
        if( !GetFollow() )
            rSect.SimpleFormat();
        if( !rSect.IsColLocked() )
            rSect.InvalidateSize();
    }
}

// NOTE: call <SwSectionFrame::Init()> directly after creation of a new section
//       frame and its insert in the layout.
void SwSectionFrame::Init()
{
    assert(GetUpper() && "SwSectionFrame::Init before insertion?!");
    SwRectFnSet aRectFnSet(this);
    tools::Long nWidth = aRectFnSet.GetWidth(GetUpper()->getFramePrintArea());

    {
        SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
        aRectFnSet.SetWidth( aFrm, nWidth );
        aRectFnSet.SetHeight( aFrm, 0 );
    }

    // #109700# LRSpace for sections
    const SvxLRSpaceItem& rLRSpace = GetFormat()->GetLRSpace();

    {
        SwFrameAreaDefinition::FramePrintAreaWriteAccess aPrt(*this);
        aRectFnSet.SetLeft( aPrt, rLRSpace.GetLeft() );
        aRectFnSet.SetWidth( aPrt, nWidth - rLRSpace.GetLeft() - rLRSpace.GetRight() );
        aRectFnSet.SetHeight( aPrt, 0 );
    }

    const SwFormatCol &rCol = GetFormat()->GetCol();
    if( ( rCol.GetNumCols() > 1 || IsAnyNoteAtEnd() ) && !IsInFootnote() )
    {
        const SwFormatCol *pOld = Lower() ? &rCol : new SwFormatCol;
        ChgColumns( *pOld, rCol, IsAnyNoteAtEnd() );
        if( pOld != &rCol )
            delete pOld;
    }
}

void SwSectionFrame::DestroyImpl()
{
    if( GetFormat() && !GetFormat()->GetDoc()->IsInDtor() )
    {
        SwRootFrame *pRootFrame = getRootFrame();
        if( pRootFrame )
            pRootFrame->RemoveFromList( this );
        if( IsFollow() )
        {
            SwSectionFrame *pMaster = FindMaster();
            if( pMaster )
            {
                PROTOCOL( this, PROT::Section, DbgAction::DelFollow, pMaster )
                pMaster->SetFollow( GetFollow() );
                // A Master always grabs the space until the lower edge of his
                // Upper. If he doesn't have a Follow anymore, he can
                // release it, which is why the Size of the Master is
                // invalidated.
                if( !GetFollow() )
                    pMaster->InvalidateSize();
            }
        }
#if defined DBG_UTIL
        else if( HasFollow() )
        {
            PROTOCOL( this, PROT::Section, DbgAction::DelMaster, GetFollow() )
        }
#endif
    }

    SwLayoutFrame::DestroyImpl();
}

SwSectionFrame::~SwSectionFrame()
{
}

void SwSectionFrame::DelEmpty( bool bRemove )
{
    if( IsColLocked() )
    {
        OSL_ENSURE( !bRemove, "Don't delete locked SectionFrames" );
        return;
    }
    SwFrame* pUp = GetUpper();
    if( pUp )
    {
        // #i27138#
        // notify accessibility paragraphs objects about changed
        // CONTENT_FLOWS_FROM/_TO relation.
        // Relation CONTENT_FLOWS_FROM for current next paragraph will change
        // and relation CONTENT_FLOWS_TO for current previous paragraph will change.
#if !ENABLE_WASM_STRIP_ACCESSIBILITY
        {
            SwViewShell* pViewShell( getRootFrame()->GetCurrShell() );
            if ( pViewShell && pViewShell->GetLayout() &&
                 pViewShell->GetLayout()->IsAnyShellAccessible() )
            {
                auto pNext = FindNextCnt( true );
                auto pPrev = FindPrevCnt();
                pViewShell->InvalidateAccessibleParaFlowRelation(
                                pNext ? pNext->DynCastTextFrame() : nullptr,
                                pPrev ? pPrev->DynCastTextFrame() : nullptr );
            }
        }
#endif
        Cut_( bRemove );
    }
    SwSectionFrame *pMaster = IsFollow() ? FindMaster() : nullptr;
    if (pMaster)
    {
        pMaster->SetFollow( GetFollow() );
        // A Master always grabs the space until the lower edge of his
        // Upper. If he doesn't have a Follow anymore, he can
        // release it, which is why the Size of the Master is
        // invalidated.
        if( !GetFollow() && !pMaster->IsColLocked() )
            pMaster->InvalidateSize();
    }
    SetFollow(nullptr);
    if( !pUp )
        return;

    {
        SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
        aFrm.Height( 0 );
    }

    // If we are destroyed immediately anyway, we don't need
    // to put us into the list
    if( bRemove )
    {   // If we already were half dead before this DelEmpty,
        // we are likely in the list and have to remove us from
        // it
        if( !m_pSection && getRootFrame() )
            getRootFrame()->RemoveFromList( this );
    }
    else if( getRootFrame() )
    {
        getRootFrame()->InsertEmptySct( this );
    }

    m_pSection = nullptr;  // like this a reanimation is virtually impossible though
}

void SwSectionFrame::Cut()
{
    Cut_( true );
}

void SwSectionFrame::Cut_( bool bRemove )
{
    OSL_ENSURE( GetUpper(), "Cut without Upper()." );

    PROTOCOL( this, PROT::Cut, DbgAction::NONE, GetUpper() )

    SwPageFrame *pPage = FindPageFrame();
    InvalidatePage( pPage );
    SwFrame *pFrame = GetNext();
    SwFrame* pPrepFrame = nullptr;
    while( pFrame && pFrame->IsSctFrame() && !static_cast<SwSectionFrame*>(pFrame)->GetSection() )
        pFrame = pFrame->GetNext();
    if( pFrame )
    {   // The former successor might have calculated a gap to the predecessor
        // which is now obsolete since he becomes the first
        pFrame->InvalidatePrt_();
        pFrame->InvalidatePos_();
        if( pFrame->IsSctFrame() )
            pFrame = static_cast<SwSectionFrame*>(pFrame)->ContainsAny();
        if ( pFrame && pFrame->IsContentFrame() )
        {
            pFrame->InvalidatePage( pPage );
            if( IsInFootnote() && !GetIndPrev() )
                pPrepFrame = pFrame;
        }
    }
    else
    {
        InvalidateNextPos();
        // Someone has to take over the retouching: predecessor or Upper
        pFrame = GetPrev();
        if ( nullptr != pFrame )
        {
            pFrame->SetRetouche();
            pFrame->Prepare( PrepareHint::WidowsOrphans );
            if ( pFrame->IsContentFrame() )
                pFrame->InvalidatePage( pPage );
        }
        // If I am (was) the only FlowFrame in my Upper, then he has to take over
        // the retouching.
        // Furthermore a blank page could have emerged
        else
        {   SwRootFrame *pRoot = static_cast<SwRootFrame*>(pPage->GetUpper());
            pRoot->SetSuperfluous();
            GetUpper()->SetCompletePaint();
        }
    }
    // First remove, then shrink Upper
    SwLayoutFrame *pUp = GetUpper();
    if( bRemove )
    {
        RemoveFromLayout();
        if( pUp && !pUp->Lower() && pUp->IsFootnoteFrame() && !pUp->IsColLocked() &&
            pUp->GetUpper() )
        {
            pUp->Cut();
            SwFrame::DestroyFrame(pUp);
            pUp = nullptr;
        }
    }
    if( pPrepFrame )
        pPrepFrame->Prepare( PrepareHint::FootnoteInvalidation );
    if ( !pUp )
        return;

    SwRectFnSet aRectFnSet(this);
    SwTwips nFrameHeight = aRectFnSet.GetHeight(getFrameArea());
    if( nFrameHeight <= 0 )
        return;

    if( !bRemove )
    {
        SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
        aRectFnSet.SetHeight( aFrm, 0 );

        SwFrameAreaDefinition::FramePrintAreaWriteAccess aPrt(*this);
        aRectFnSet.SetHeight( aPrt, 0 );
    }

    pUp->Shrink( nFrameHeight );
}

void SwSectionFrame::Paste( SwFrame* pParent, SwFrame* pSibling )
{
    OSL_ENSURE( pParent, "No parent for Paste()." );
    OSL_ENSURE( pParent->IsLayoutFrame(), "Parent is ContentFrame." );
    OSL_ENSURE( pParent != this, "I'm my own parent." );
    OSL_ENSURE( pSibling != this, "I'm my own neighbour." );
    OSL_ENSURE( !GetPrev() && !GetUpper(),
            "I am still registered somewhere." );

    PROTOCOL( this, PROT::Paste, DbgAction::NONE, GetUpper() )

    // Add to the tree
    SwSectionFrame* pSect = pParent->FindSctFrame();
    // Assure that parent is not inside a table frame, which is inside the found section frame.
    if ( pSect )
    {
        SwTabFrame* pTableFrame = pParent->FindTabFrame();
        if ( pTableFrame &&
             pSect->IsAnLower( pTableFrame ) )
        {
            pSect = nullptr;
        }
    }

    SwRectFnSet aRectFnSet(pParent);
    if( pSect && HasToBreak( pSect ) )
    {
        if( pParent->IsColBodyFrame() ) // dealing with a single-column area
        {
            // If we are coincidentally at the end of a column, pSibling
            // has to point to the first frame of the next column in order
            // for the content of the next column to be moved correctly to the
            // newly created pSect by the InsertGroup
            SwColumnFrame *pCol = static_cast<SwColumnFrame*>(pParent->GetUpper());
            while( !pSibling && nullptr != ( pCol = static_cast<SwColumnFrame*>(pCol->GetNext()) ) )
                pSibling = static_cast<SwLayoutFrame*>(pCol->Lower())->Lower();
            if( pSibling )
            {
                // Even worse: every following column content has to
                // be attached to the pSibling-chain in order to be
                // taken along
                SwFrame *pTmp = pSibling;
                while ( nullptr != ( pCol = static_cast<SwColumnFrame*>(pCol->GetNext()) ) )
                {
                    while ( pTmp->GetNext() )
                        pTmp = pTmp->GetNext();
                    SwFrame* pSave = ::SaveContent( pCol );
                    if (pSave)
                        ::RestoreContent( pSave, pSibling->GetUpper(), pTmp );
                }
            }
        }
        pParent = pSect;
        pSect = new SwSectionFrame( *static_cast<SwSectionFrame*>(pParent)->GetSection(), pParent );
        // if pParent is decomposed into two parts, its Follow has to be attached
        // to the new second part
        pSect->SetFollow( static_cast<SwSectionFrame*>(pParent)->GetFollow() );
        static_cast<SwSectionFrame*>(pParent)->SetFollow( nullptr );
        if( pSect->GetFollow() )
            pParent->InvalidateSize_();

        const bool bInserted = InsertGroupBefore( pParent, pSibling, pSect );
        if (bInserted)
        {
            pSect->Init();
            aRectFnSet.MakePos( *pSect, pSect->GetUpper(), pSect->GetPrev(), true);
        }
        if( !static_cast<SwLayoutFrame*>(pParent)->Lower() )
        {
            SwSectionFrame::MoveContentAndDelete( static_cast<SwSectionFrame*>(pParent), false );
            pParent = this;
        }
    }
    else
        InsertGroupBefore( pParent, pSibling, nullptr );

    InvalidateAll_();
    SwPageFrame *pPage = FindPageFrame();
    InvalidatePage( pPage );

    if ( pSibling )
    {
        pSibling->InvalidatePos_();
        pSibling->InvalidatePrt_();
        if ( pSibling->IsContentFrame() )
            pSibling->InvalidatePage( pPage );
    }

    SwTwips nFrameHeight = aRectFnSet.GetHeight(getFrameArea());
    if( nFrameHeight )
        pParent->Grow( nFrameHeight );

    if ( GetPrev() && !IsFollow() )
    {
        GetPrev()->InvalidateSize();
        if ( GetPrev()->IsContentFrame() )
            GetPrev()->InvalidatePage( pPage );
    }
}

bool SwSectionFrame::HasToBreak( const SwFrame* pFrame ) const
{
    if( !pFrame->IsSctFrame() )
        return false;

    const SwSectionFormat *pTmp = static_cast<const SwSectionFormat*>(GetFormat());

    const SwFrameFormat *pOtherFormat = static_cast<const SwSectionFrame*>(pFrame)->GetFormat();
    do
    {
        pTmp = pTmp->GetParent();
        if( !pTmp )
            return false;
        if( pTmp == pOtherFormat )
            return true;
    } while( true ); // ( pTmp->GetSect().GetValue() );
}

void SwSectionFrame::MergeNext( SwSectionFrame* pNxt )
{
    if (pNxt->IsDeleteForbidden())
        return;

    if (pNxt->IsJoinLocked() || GetSection() != pNxt->GetSection())
        return;

    PROTOCOL( this, PROT::Section, DbgAction::Merge, pNxt )

    SwFrame* pTmp = ::SaveContent( pNxt );
    if( pTmp )
    {
        SwFrame* pLast = Lower();
        SwLayoutFrame* pLay = this;
        if( pLast )
        {
            while( pLast->GetNext() )
                pLast = pLast->GetNext();
            if( pLast->IsColumnFrame() )
            {   // Columns now with BodyFrame
                pLay = static_cast<SwLayoutFrame*>(static_cast<SwLayoutFrame*>(pLast)->Lower());
                pLast = pLay->Lower();
                if( pLast )
                    while( pLast->GetNext() )
                        pLast = pLast->GetNext();
            }
        }
        ::RestoreContent( pTmp, pLay, pLast );
    }
    SetFollow( pNxt->GetFollow() );
    pNxt->SetFollow( nullptr );
    pNxt->Cut();
    SwFrame::DestroyFrame(pNxt);
    InvalidateSize();
}

bool SwSectionFrame::SplitSect( SwFrame* pFrame, bool bApres )
{
    assert(pFrame && "SplitSect: Why?");
    SwFrame* pOther = bApres ? pFrame->FindNext() : pFrame->FindPrev();
    if( !pOther )
        return false;
    SwSectionFrame* pSect = pOther->FindSctFrame();
    if( pSect != this )
        return false;
    // Put the content aside
    SwFrame* pSav = ::SaveContent( this, bApres ? pOther : pFrame );
    OSL_ENSURE( pSav, "SplitSect: What's on?" );
    if( pSav ) // be robust
    {   // Create a new SctFrame, not as a Follower/master
        SwSectionFrame* pNew = new SwSectionFrame( *pSect->GetSection(), pSect );
        pNew->InsertBehind( pSect->GetUpper(), pSect );
        pNew->Init();
        SwRectFnSet aRectFnSet(this);
        aRectFnSet.MakePos( *pNew, nullptr, pSect, true );
        // OD 25.03.2003 #108339# - restore content:
        // determine layout frame for restoring content after the initialization
        // of the section frame. In the section initialization the columns are
        // created.
        {
            SwLayoutFrame* pLay = pNew;
            // Search for last layout frame, e.g. for columned sections.
            while( pLay->Lower() && pLay->Lower()->IsLayoutFrame() )
                pLay = static_cast<SwLayoutFrame*>(pLay->Lower());
            ::RestoreContent( pSav, pLay, nullptr );
        }
        InvalidateSize_();
        if( HasFollow() )
        {
            pNew->SetFollow( GetFollow() );
            SetFollow( nullptr );
        }
        return true;
    }
    return false;
}

// If a multi-column section is cancelled, the ContentFrames have to be
// invalidated
static void lcl_InvalidateInfFlags( SwFrame* pFrame, bool bInva )
{
    while ( pFrame )
    {
        pFrame->InvalidateInfFlags();
        if( bInva )
        {
            pFrame->InvalidatePos_();
            pFrame->InvalidateSize_();
            pFrame->InvalidatePrt_();
        }
        if( pFrame->IsLayoutFrame() )
            lcl_InvalidateInfFlags( static_cast<SwLayoutFrame*>(pFrame)->GetLower(), false );
        pFrame = pFrame->GetNext();
    }
}

// Works like SwContentFrame::ImplGetNextContentFrame, but starts with a LayoutFrame
static SwContentFrame* lcl_GetNextContentFrame( const SwLayoutFrame* pLay, bool bFwd )
{
    if ( bFwd )
    {
        if ( pLay->GetNext() && pLay->GetNext()->IsContentFrame() )
            return const_cast<SwContentFrame*>(static_cast<const SwContentFrame*>(pLay->GetNext()));
    }
    else
    {
        if ( pLay->GetPrev() && pLay->GetPrev()->IsContentFrame() )
            return const_cast<SwContentFrame*>(static_cast<const SwContentFrame*>(pLay->GetPrev()));
    }

    const SwFrame* pFrame = pLay;
    SwContentFrame *pContentFrame = nullptr;
    bool bGoingUp = true;
    do {
        const SwFrame *p = nullptr;
        bool bGoingFwdOrBwd = false;

        bool bGoingDown = !bGoingUp && pFrame->IsLayoutFrame();
        if (bGoingDown)
        {
            p = static_cast<const SwLayoutFrame*>(pFrame)->Lower();
            bGoingDown = nullptr != p;
        }
        if ( !bGoingDown )
        {
            p = pFrame->IsFlyFrame() ?
                ( bFwd ? static_cast<const SwFlyFrame*>(pFrame)->GetNextLink() : static_cast<const SwFlyFrame*>(pFrame)->GetPrevLink() ) :
                ( bFwd ? pFrame->GetNext() :pFrame->GetPrev() );
            bGoingFwdOrBwd = nullptr != p;
            if ( !bGoingFwdOrBwd )
            {
                p = pFrame->GetUpper();
                bGoingUp = nullptr != p;
                if ( !bGoingUp )
                    return nullptr;
            }
        }

        bGoingUp = !( bGoingFwdOrBwd || bGoingDown );
        assert(p);
        if (!bFwd && bGoingDown)
            while ( p->GetNext() )
                p = p->GetNext();

        pFrame = p;
    } while ( nullptr == (pContentFrame = (pFrame->IsContentFrame() ? const_cast<SwContentFrame*>(static_cast<const SwContentFrame*>(pFrame)) : nullptr) ));

    return pContentFrame;
}

namespace
{
    SwLayoutFrame* FirstLeaf(SwSectionFrame* pLayFrame)
    {
        if (pLayFrame->Lower() && pLayFrame->Lower()->IsColumnFrame())
            return pLayFrame->GetNextLayoutLeaf();
        return pLayFrame;
    }

    bool CanContainSplitSection(const SwFrame* pFrame)
    {
        if (!pFrame->IsInTab())
            return true;

        // The frame is in a table, see if the table is in a section.
        bool bRet = !pFrame->FindTabFrame()->IsInSct();

        if (bRet)
        {
            // Don't try to split if the frame itself is a section frame with
            // multiple columns.
            if (pFrame->IsSctFrame())
            {
                const SwFrame* pLower = pFrame->GetLower();
                if (pLower && pLower->IsColumnFrame())
                    bRet = false;
            }
        }

        return bRet;
    }
}

void SwSectionFrame::MoveContentAndDelete( SwSectionFrame* pDel, bool bSave )
{
    bool bSize = pDel->Lower() && pDel->Lower()->IsColumnFrame();
    SwFrame* pPrv = pDel->GetPrev();
    SwLayoutFrame* pUp = pDel->GetUpper();
    // OD 27.03.2003 #i12711# - initialize local pointer variables.
    SwSectionFrame* pPrvSct = nullptr;
    SwSectionFrame* pNxtSct = nullptr;
    SwSectionFormat* pParent = static_cast<SwSectionFormat*>(pDel->GetFormat())->GetParent();
    if( pDel->IsInTab() && pParent )
    {
        SwTabFrame *pTab = pDel->FindTabFrame();
        // If we are within a table, we can only have broken up sections that
        // are inside as well, but not a section that contains the whole table.
        if( pTab->IsInSct() && pParent == pTab->FindSctFrame()->GetFormat() )
            pParent = nullptr;
    }
    // If our Format has a parent, we have probably broken up another
    // SectionFrame, which has to be checked. To do so we first acquire the
    // succeeding and the preceding ContentFrame, let's see if they
    // lay in the SectionFrames.
    // OD 27.03.2003 #i12711# - check, if previous and next section belonging
    // together and can be joined, *not* only if deleted section contains content.
    if ( pParent )
    {
        SwFrame* pPrvContent = lcl_GetNextContentFrame( pDel, false );
        pPrvSct = pPrvContent ? pPrvContent->FindSctFrame() : nullptr;
        SwFrame* pNxtContent = lcl_GetNextContentFrame( pDel, true );
        pNxtSct = pNxtContent ? pNxtContent->FindSctFrame() : nullptr;
    }
    else
    {
        pParent = nullptr;
        pPrvSct = pNxtSct = nullptr;
    }

    // Now the content is put aside and the frame is destroyed
    SwFrame *pSave = bSave ? ::SaveContent( pDel ) : nullptr;
    bool bOldFootnote = true;
    if( pSave && pUp->IsFootnoteFrame() )
    {
        bOldFootnote = static_cast<SwFootnoteFrame*>(pUp)->IsColLocked();
        static_cast<SwFootnoteFrame*>(pUp)->ColLock();
    }
    pDel->DelEmpty( true );
    SwFrame::DestroyFrame(pDel);
    if( pParent )
    {   // Search for the appropriate insert position
        if( pNxtSct && pNxtSct->GetFormat() == pParent )
        {   // Here we can insert ourselves at the beginning
            pUp = FirstLeaf( pNxtSct );
            pPrv = nullptr;
            if( pPrvSct && ( pPrvSct->GetFormat() != pParent ) )
                pPrvSct = nullptr; // In order that nothing is merged
        }
        else if( pPrvSct && pPrvSct->GetFormat() == pParent )
        {   // Wonderful, here we can insert ourselves at the end
            pUp = pPrvSct;
            if( pUp->Lower() && pUp->Lower()->IsColumnFrame() )
            {
                pUp = static_cast<SwLayoutFrame*>(pUp->GetLastLower());
                // The body of the last column
                pUp = static_cast<SwLayoutFrame*>(pUp->Lower());
            }
            // In order to perform the insertion after the last one
            pPrv = pUp->GetLastLower();
            pPrvSct = nullptr; // Such that nothing is merged
        }
        else
        {
            if( pSave )
            {   // Following situations: before and after the section-to-be
                // deleted there is the section boundary of the enclosing
                // section, or another (sibling) section connects subsequently,
                // that derives from the same Parent.
                // In that case, there's not (yet) a part of our parent available
                // that can store the content, so we create it here.
                pPrvSct = new SwSectionFrame( *pParent->GetSection(), pUp );
                pPrvSct->InsertBehind( pUp, pPrv );
                pPrvSct->Init();
                SwRectFnSet aRectFnSet(pUp);
                aRectFnSet.MakePos( *pPrvSct, pUp, pPrv, true );
                pUp = FirstLeaf( pPrvSct );
                pPrv = nullptr;
            }
            pPrvSct = nullptr; // Such that nothing will be merged
        }
    }
    // The content is going to be inserted...
    if( pSave )
    {
        lcl_InvalidateInfFlags( pSave, bSize );
        ::RestoreContent( pSave, pUp, pPrv );
        pUp->FindPageFrame()->InvalidateContent();
        if( !bOldFootnote )
            static_cast<SwFootnoteFrame*>(pUp)->ColUnlock();
    }
    // Now two parts of the superior section could possibly be merged
    if( pPrvSct && !pPrvSct->IsJoinLocked() )
    {
        OSL_ENSURE( pNxtSct, "MoveContent: No Merge" );
        pPrvSct->MergeNext( pNxtSct );
    }
}

void SwSectionFrame::MakeAll(vcl::RenderContext* pRenderContext)
{
    if ( IsJoinLocked() || IsColLocked() || StackHack::IsLocked() || StackHack::Count() > 50 )
        return;
    if( !m_pSection ) // Via DelEmpty
    {
#ifdef DBG_UTIL
        OSL_ENSURE( getRootFrame()->IsInDelList( this ), "SectionFrame without Section" );
#endif
        if( !isFrameAreaPositionValid() )
        {
            if( GetUpper() )
            {
                SwRectFnSet aRectFnSet(GetUpper());
                aRectFnSet.MakePos( *this, GetUpper(), GetPrev(), false );
            }

            if (getFrameArea().Height() == 0)
            {
                // SwLayoutFrame::MakeAll() is not called for to-be-deleted
                // section frames (which would invalidate the position of the
                // next frame via the SwLayNotify dtor), so call it manually.
                if (SwFrame* pNext = GetNext())
                    pNext->InvalidatePos();
            }
        }

        setFrameAreaPositionValid(true);
        setFrameAreaSizeValid(true);
        setFramePrintAreaValid(true);
        return;
    }
    LockJoin(); // I don't let myself to be destroyed on the way

    while( GetNext() && GetNext() == GetFollow() )
    {
        const SwFrame* pFoll = GetFollow();
        MergeNext( static_cast<SwSectionFrame*>(GetNext()) );
        if( pFoll == GetFollow() )
            break;
    }

    // OD 2004-03-15 #116561# - In online layout join the follows, if section
    // can grow.
    const SwViewShell *pSh = getRootFrame()->GetCurrShell();

    // Split sections inside table cells: need to merge all follows of the
    // section here, as later we won't attempt doing so.
    bool bCanContainSplitSection = false;
    if (IsInTab() && GetUpper())
        bCanContainSplitSection = CanContainSplitSection(GetUpper());

    if( pSh && (pSh->GetViewOptions()->getBrowseMode() || bCanContainSplitSection) &&
         ( Grow( LONG_MAX, true ) > 0 ) )
    {
        while( GetFollow() )
        {
            const SwFrame* pFoll = GetFollow();
            MergeNext( GetFollow() );
            if( pFoll == GetFollow() )
                break;
        }
    }

    // A section with Follow uses all the space until the lower edge of the
    // Upper. If it moves, its size can grow or decrease...
    if( !isFrameAreaPositionValid() && ToMaximize( false ) )
    {
        setFrameAreaSizeValid(false);
    }

    SwLayoutFrame::MakeAll(getRootFrame()->GetCurrShell()->GetOut());

    if (IsInTab())
    {
        // In case the section is in a table, then calculate the lower right
        // now. Just setting the valid size flag of the lower to false may not
        // be enough, as lcl_RecalcRow() can call
        // SwFrame::ValidateThisAndAllLowers(), and then we don't attempt
        // calculating the proper position of the lower.
        SwFrame* pLower = Lower();
        if (pLower && !pLower->isFrameAreaPositionValid())
            pLower->Calc(pRenderContext);
    }

    UnlockJoin();
    if( m_pSection && IsSuperfluous() )
        DelEmpty( false );
}

bool SwSectionFrame::ShouldBwdMoved( SwLayoutFrame *, bool & )
{
    OSL_FAIL( "Oops, where is my tinfoil hat?" );
    return false;
}

const SwSectionFormat* SwSectionFrame::GetEndSectFormat_() const
{
    const SwSectionFormat *pFormat = m_pSection->GetFormat();
    while( !pFormat->GetEndAtTextEnd().IsAtEnd() )
    {
        if( auto pNewFormat = dynamic_cast< const SwSectionFormat *>( pFormat->GetRegisteredIn()) )
            pFormat = pNewFormat;
        else
            return nullptr;
    }
    return pFormat;
}

static void lcl_FindContentFrame( SwContentFrame* &rpContentFrame, SwFootnoteFrame* &rpFootnoteFrame,
    SwFrame* pFrame, bool &rbChkFootnote )
{
    if( !pFrame )
        return;

    while( pFrame->GetNext() )
        pFrame = pFrame->GetNext();
    while( !rpContentFrame && pFrame )
    {
        if( pFrame->IsContentFrame() )
            rpContentFrame = static_cast<SwContentFrame*>(pFrame);
        else if( pFrame->IsLayoutFrame() )
        {
            if( pFrame->IsFootnoteFrame() )
            {
                if( rbChkFootnote )
                {
                    rpFootnoteFrame = static_cast<SwFootnoteFrame*>(pFrame);
                    rbChkFootnote = rpFootnoteFrame->GetAttr()->GetFootnote().IsEndNote();
                }
            }
            else
                lcl_FindContentFrame( rpContentFrame, rpFootnoteFrame,
                    static_cast<SwLayoutFrame*>(pFrame)->Lower(), rbChkFootnote );
        }
        pFrame = pFrame->GetPrev();
    }
}

SwContentFrame *SwSectionFrame::FindLastContent( SwFindMode nMode )
{
    SwContentFrame *pRet = nullptr;
    SwFootnoteFrame *pFootnoteFrame = nullptr;
    SwSectionFrame *pSect = this;
    if( nMode != SwFindMode::None )
    {
        const SwSectionFormat *pFormat = IsEndnAtEnd() ? GetEndSectFormat() :
                                     m_pSection->GetFormat();
        do {
            while( pSect->HasFollow() )
                pSect = pSect->GetFollow();
            SwFrame* pTmp = pSect->FindNext();
            while( pTmp && pTmp->IsSctFrame() &&
                   !static_cast<SwSectionFrame*>(pTmp)->GetSection() )
                pTmp = pTmp->FindNext();
            if( pTmp && pTmp->IsSctFrame() &&
                static_cast<SwSectionFrame*>(pTmp)->IsDescendantFrom( pFormat ) )
                pSect = static_cast<SwSectionFrame*>(pTmp);
            else
                break;
        } while( true );
    }
    bool bFootnoteFound = nMode == SwFindMode::EndNote;
    do
    {
        lcl_FindContentFrame( pRet, pFootnoteFrame, pSect->Lower(), bFootnoteFound );
        if( pRet || !pSect->IsFollow() || nMode == SwFindMode::None ||
            ( SwFindMode::MyLast == nMode && this == pSect ) )
            break;
        pSect = pSect->FindMaster();
    } while( pSect );
    if( ( nMode == SwFindMode::EndNote ) && pFootnoteFrame )
        pRet = pFootnoteFrame->ContainsContent();
    return pRet;
}

bool SwSectionFrame::CalcMinDiff( SwTwips& rMinDiff ) const
{
    if( ToMaximize( true ) )
    {
        SwRectFnSet aRectFnSet(this);
        rMinDiff = aRectFnSet.GetPrtBottom(*GetUpper());
        rMinDiff = aRectFnSet.BottomDist( getFrameArea(), rMinDiff );
        return true;
    }
    return false;
}

static SwFootnoteFrame* lcl_FindEndnote( SwSectionFrame* &rpSect, bool &rbEmpty,
    SwLayouter *pLayouter )
{
    // if rEmpty is set, the rpSect is already searched
    SwSectionFrame* pSect = rbEmpty ? rpSect->GetFollow() : rpSect;
    while( pSect )
    {
        OSL_ENSURE( (pSect->Lower() && pSect->Lower()->IsColumnFrame()) || pSect->GetUpper()->IsFootnoteFrame(),
                "InsertEndnotes: Where's my column?" );

        // i73332: Columned section in endnote
        SwColumnFrame* pCol = nullptr;
        if(pSect->Lower() && pSect->Lower()->IsColumnFrame())
            pCol = static_cast<SwColumnFrame*>(pSect->Lower());

        while( pCol ) // check all columns
        {
            SwFootnoteContFrame* pFootnoteCont = pCol->FindFootnoteCont();
            if( pFootnoteCont )
            {
                SwFootnoteFrame* pRet = static_cast<SwFootnoteFrame*>(pFootnoteCont->Lower());
                while( pRet ) // look for endnotes
                {
                    /* CollectEndNode can destroy pRet so we need to get the
                       next early
                    */
                    SwFootnoteFrame* pRetNext = static_cast<SwFootnoteFrame*>(pRet->GetNext());
                    if( pRet->GetAttr()->GetFootnote().IsEndNote() )
                    {
                        if( pRet->GetMaster() )
                        {
                            if( pLayouter )
                                pLayouter->CollectEndnote( pRet );
                            else
                                return nullptr;
                        }
                        else
                            return pRet; // Found
                    }
                    pRet = pRetNext;
                }
            }
            pCol = static_cast<SwColumnFrame*>(pCol->GetNext());
        }
        rpSect = pSect;
        pSect = pLayouter ? pSect->GetFollow() : nullptr;
        rbEmpty = true;
    }
    return nullptr;
}

static void lcl_ColumnRefresh( SwSectionFrame* pSect, bool bFollow )
{
    vcl::RenderContext* pRenderContext = pSect->getRootFrame()->GetCurrShell()->GetOut();
    while( pSect )
    {
        bool bOldLock = pSect->IsColLocked();
        pSect->ColLock();
        if( pSect->Lower() && pSect->Lower()->IsColumnFrame() )
        {
            SwColumnFrame *pCol = static_cast<SwColumnFrame*>(pSect->Lower());
            do
            {   pCol->InvalidateSize_();
                pCol->InvalidatePos_();
                static_cast<SwLayoutFrame*>(pCol)->Lower()->InvalidateSize_();
                pCol->Calc(pRenderContext);   // calculation of column and
                static_cast<SwLayoutFrame*>(pCol)->Lower()->Calc(pRenderContext);  // body
                pCol = static_cast<SwColumnFrame*>(pCol->GetNext());
            } while ( pCol );
        }
        if( !bOldLock )
            pSect->ColUnlock();
        if( bFollow )
            pSect = pSect->GetFollow();
        else
            pSect = nullptr;
    }
}

void SwSectionFrame::CollectEndnotes( SwLayouter* pLayouter )
{
    OSL_ENSURE( IsColLocked(), "CollectEndnotes: You love the risk?" );
    // i73332: Section in footnode does not have columns!
    OSL_ENSURE( (Lower() && Lower()->IsColumnFrame()) || GetUpper()->IsFootnoteFrame(), "Where's my column?" );

    SwSectionFrame* pSect = this;
    SwFootnoteFrame* pFootnote;
    bool bEmpty = false;
    // pSect is the last sectionfrm without endnotes or the this-pointer
    // the first sectionfrm with endnotes may be destroyed, when the endnotes
    // is cutted
    while( nullptr != (pFootnote = lcl_FindEndnote( pSect, bEmpty, pLayouter )) )
        pLayouter->CollectEndnote( pFootnote );
    if( pLayouter->HasEndnotes() )
        lcl_ColumnRefresh( this, true );
}

void SwSectionFrame::CheckClipping( bool bGrow, bool bMaximize )
{
    SwRectFnSet aRectFnSet(this);
    tools::Long nDiff;
    SwTwips nDeadLine = aRectFnSet.GetPrtBottom(*GetUpper());
    if( bGrow && ( !IsInFly() || !GetUpper()->IsColBodyFrame() ||
                   !FindFlyFrame()->IsLocked() ) )
    {
        nDiff = -aRectFnSet.BottomDist( getFrameArea(), nDeadLine );
        if( !bMaximize )
            nDiff += Undersize();
        if( nDiff > 0 )
        {
            tools::Long nAdd = GetUpper()->Grow( nDiff );
            if( aRectFnSet.IsVert() )
                nDeadLine -= nAdd;
            else
                nDeadLine += nAdd;
        }
    }
    nDiff = -aRectFnSet.BottomDist( getFrameArea(), nDeadLine );
    SetUndersized( !bMaximize && nDiff >= 0 );
    const bool bCalc = ( IsUndersized() || bMaximize ) &&
                       ( nDiff ||
                         aRectFnSet.GetTop(getFramePrintArea()) > aRectFnSet.GetHeight(getFrameArea()) );
    // OD 03.11.2003 #i19737# - introduce local variable <bExtraCalc> to indicate
    // that a calculation has to be done beside the value of <bCalc>.
    bool bExtraCalc = false;
    if( !bCalc && !bGrow && IsAnyNoteAtEnd() && !IsInFootnote() )
    {
        SwSectionFrame *pSect = this;
        bool bEmpty = false;
        SwLayoutFrame* pFootnote = IsEndnAtEnd() ?
            lcl_FindEndnote( pSect, bEmpty, nullptr ) : nullptr;
        if( pFootnote )
        {
            pFootnote = pFootnote->FindFootnoteBossFrame();
            SwFrame* pTmp = FindLastContent( SwFindMode::LastCnt );
            // OD 08.11.2002 #104840# - use <SwLayoutFrame::IsBefore(..)>
            if ( pTmp && pFootnote->IsBefore( pTmp->FindFootnoteBossFrame() ) )
                bExtraCalc = true;
        }
        else if( GetFollow() && !GetFollow()->ContainsAny() )
            bExtraCalc = true;
    }
    if ( !(bCalc || bExtraCalc) )
        return;

    nDiff = aRectFnSet.YDiff( nDeadLine, aRectFnSet.GetTop(getFrameArea()) );
    if( nDiff < 0 )
        nDeadLine = aRectFnSet.GetTop(getFrameArea());
    const Size aOldSz( getFramePrintArea().SSize() );
    tools::Long nTop = aRectFnSet.GetTopMargin(*this);

    {
        SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
        aRectFnSet.SetBottom( aFrm, nDeadLine );
    }

    nDiff = aRectFnSet.GetHeight(getFrameArea());
    if( nTop > nDiff )
        nTop = nDiff;
    aRectFnSet.SetYMargins( *this, nTop, 0 );

    // OD 18.09.2002 #100522#
    // Determine, if height has changed.
    // Note: In vertical layout the height equals the width value.
    bool bHeightChanged = aRectFnSet.IsVert() ?
                        (aOldSz.Width() != getFramePrintArea().Width()) :
                        (aOldSz.Height() != getFramePrintArea().Height());
    // Last but not least we have changed the height again, thus the inner
    // layout (columns) is calculated and the content as well.
    // OD 18.09.2002 #100522#
    // calculate content, only if height has changed.
    // OD 03.11.2003 #i19737# - restriction of content calculation too strong.
    // If an endnote has an incorrect position or a follow section contains
    // no content except footnotes/endnotes, the content has also been calculated.
    if ( !(( bHeightChanged || bExtraCalc ) && Lower()) )
        return;

    if( Lower()->IsColumnFrame() )
    {
        lcl_ColumnRefresh( this, false );
        ::CalcContent( this );
    }
    else
    {
        ChgLowersProp( aOldSz );
        if( !bMaximize && !IsContentLocked() )
            ::CalcContent( this );
    }
}

void SwSectionFrame::SimpleFormat()
{
    if ( IsJoinLocked() || IsColLocked() )
        return;
    LockJoin();
    SwRectFnSet aRectFnSet(this);
    if( GetPrev() || GetUpper() )
    {
        // assure notifications on position changes.
        const SwLayNotify aNotify( this );
        aRectFnSet.MakePos( *this, GetUpper(), GetPrev(), false );
        setFrameAreaPositionValid(true);
    }
    SwTwips nDeadLine = aRectFnSet.GetPrtBottom(*GetUpper());
    // OD 22.10.2002 #97265# - call always method <lcl_ColumnRefresh(..)>, in
    // order to get calculated lowers, not only if there space left in its upper.
    if( aRectFnSet.BottomDist( getFrameArea(), nDeadLine ) >= 0 )
    {
        {
            SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
            aRectFnSet.SetBottom( aFrm, nDeadLine );
        }

        tools::Long nHeight = aRectFnSet.GetHeight(getFrameArea());
        tools::Long nTop = CalcUpperSpace();
        if( nTop > nHeight )
            nTop = nHeight;
        aRectFnSet.SetYMargins( *this, nTop, 0 );
    }
    lcl_ColumnRefresh( this, false );
    UnlockJoin();
}

namespace {

// #i40147# - helper class to perform extra section format
// to position anchored objects and to keep the position of whose objects locked.
class ExtraFormatToPositionObjs
{
    private:
        SwSectionFrame* mpSectFrame;
        bool mbExtraFormatPerformed;

    public:
        explicit ExtraFormatToPositionObjs( SwSectionFrame& _rSectFrame)
            : mpSectFrame( &_rSectFrame ),
              mbExtraFormatPerformed( false )
        {}

        ~ExtraFormatToPositionObjs()
        {
            if ( !mbExtraFormatPerformed )
                return;

            // release keep locked position of lower floating screen objects
            SwPageFrame* pPageFrame = mpSectFrame->FindPageFrame();
            SwSortedObjs* pObjs = pPageFrame ? pPageFrame->GetSortedObjs() : nullptr;
            if ( pObjs )
            {
                for (SwAnchoredObject* pAnchoredObj : *pObjs)
                {
                    if ( mpSectFrame->IsAnLower( pAnchoredObj->GetAnchorFrame() ) )
                    {
                        pAnchoredObj->SetKeepPosLocked( false );
                    }
                }
            }
        }

        // #i81555#
        void InitObjs( SwFrame& rFrame )
        {
            SwSortedObjs* pObjs = rFrame.GetDrawObjs();
            if ( pObjs )
            {
                for (SwAnchoredObject* pAnchoredObj : *pObjs)
                {
                    pAnchoredObj->UnlockPosition();
                    pAnchoredObj->SetClearedEnvironment( false );
                }
            }
            if ( rFrame.IsLayoutFrame() )
            {
                SwFrame* pLowerFrame = rFrame.GetLower();
                while ( pLowerFrame != nullptr )
                {
                    InitObjs( *pLowerFrame );

                    pLowerFrame = pLowerFrame->GetNext();
                }
            }
        }

        void FormatSectionToPositionObjs()
        {
            vcl::RenderContext* pRenderContext = mpSectFrame->getRootFrame()->GetCurrShell()->GetOut();
            // perform extra format for multi-columned section.
            if ( !(mpSectFrame->Lower() && mpSectFrame->Lower()->IsColumnFrame() &&
                 mpSectFrame->Lower()->GetNext()) )
                return;

            // grow section till bottom of printing area of upper frame
            SwRectFnSet aRectFnSet(mpSectFrame);
            SwTwips nTopMargin = aRectFnSet.GetTopMargin(*mpSectFrame);
            Size aOldSectPrtSize( mpSectFrame->getFramePrintArea().SSize() );
            SwTwips nDiff = aRectFnSet.BottomDist( mpSectFrame->getFrameArea(), aRectFnSet.GetPrtBottom(*mpSectFrame->GetUpper()) );

            {
                SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*mpSectFrame);
                aRectFnSet.AddBottom( aFrm, nDiff );
            }

            aRectFnSet.SetYMargins( *mpSectFrame, nTopMargin, 0 );
            // #i59789#
            // suppress formatting, if printing area of section is too narrow
            if ( aRectFnSet.GetHeight(mpSectFrame->getFramePrintArea()) <= 0 )
            {
                return;
            }
            mpSectFrame->ChgLowersProp( aOldSectPrtSize );

            // format column frames and its body and footnote container
            SwColumnFrame* pColFrame = static_cast<SwColumnFrame*>(mpSectFrame->Lower());
            while ( pColFrame )
            {
                pColFrame->Calc(pRenderContext);
                pColFrame->Lower()->Calc(pRenderContext);
                if ( pColFrame->Lower()->GetNext() )
                {
                    pColFrame->Lower()->GetNext()->Calc(pRenderContext);
                }

                pColFrame = static_cast<SwColumnFrame*>(pColFrame->GetNext());
            }

            // unlock position of lower floating screen objects for the extra format
            // #i81555#
            // Section frame can already have changed the page and its content
            // can still be on the former page.
            // Thus, initialize objects via lower-relationship
            InitObjs( *mpSectFrame );

            // format content - first with collecting its foot-/endnotes before content
            // format, second without collecting its foot-/endnotes.
            ::CalcContent( mpSectFrame );
            ::CalcContent( mpSectFrame, true );

            // keep locked position of lower floating screen objects
            SwPageFrame* pPageFrame = mpSectFrame->FindPageFrame();
            SwSortedObjs* pObjs = pPageFrame ? pPageFrame->GetSortedObjs() : nullptr;
            if ( pObjs )
            {
                for (SwAnchoredObject* pAnchoredObj : *pObjs)
                {
                    if ( mpSectFrame->IsAnLower( pAnchoredObj->GetAnchorFrame() ) )
                    {
                        pAnchoredObj->SetKeepPosLocked( true );
                    }
                }
            }

            mbExtraFormatPerformed = true;

        }
};

}

void SwSectionFrame::Format( vcl::RenderContext* pRenderContext, const SwBorderAttrs *pAttr )
{
    if( !m_pSection ) // via DelEmpty
    {
#ifdef DBG_UTIL
        OSL_ENSURE( getRootFrame()->IsInDelList( this ), "SectionFrame without Section" );
#endif
        setFrameAreaPositionValid(true);
        setFrameAreaSizeValid(true);
        setFramePrintAreaValid(true);
        return;
    }

    SwRectFnSet aRectFnSet(this);

    if ( !isFramePrintAreaValid() )
    {
        PROTOCOL( this, PROT::PrintArea, DbgAction::NONE, nullptr )
        setFramePrintAreaValid(true);
        SwTwips nUpper = CalcUpperSpace();

        // #109700# LRSpace for sections
        const SvxLRSpaceItem& rLRSpace = GetFormat()->GetLRSpace();
        aRectFnSet.SetXMargins( *this, rLRSpace.GetLeft(), rLRSpace.GetRight() );

        if( nUpper != aRectFnSet.GetTopMargin(*this) )
        {
            setFrameAreaSizeValid(false);
            SwFrame* pOwn = ContainsAny();
            if( pOwn )
                pOwn->InvalidatePos_();
        }
        aRectFnSet.SetYMargins( *this, nUpper, 0 );
    }

    if ( isFrameAreaSizeValid() )
        return;

    PROTOCOL_ENTER( this, PROT::Size, DbgAction::NONE, nullptr )
    const tools::Long nOldHeight = aRectFnSet.GetHeight(getFrameArea());
    bool bOldLock = IsColLocked();
    ColLock();

    setFrameAreaSizeValid(true);

    // The size is only determined by the content, if the SectFrame does not have a
    // Follow. Otherwise it fills (occupies) the Upper down to the lower edge.
    // It is not responsible for the text flow, but the content is.
    bool bMaximize = ToMaximize( false );

    // OD 2004-05-17 #i28701# - If the wrapping style has to be considered
    // on object positioning, an extra formatting has to be performed
    // to determine the correct positions the floating screen objects.
    // #i40147#
    // use new helper class <ExtraFormatToPositionObjs>.
    // This class additionally keep the locked position of the objects
    // and releases this position lock keeping on destruction.
    ExtraFormatToPositionObjs aExtraFormatToPosObjs( *this );
    if ( !bMaximize &&
         GetFormat()->getIDocumentSettingAccess().get(DocumentSettingId::CONSIDER_WRAP_ON_OBJECT_POSITION) &&
         !GetFormat()->GetBalancedColumns().GetValue() )
    {
        aExtraFormatToPosObjs.FormatSectionToPositionObjs();
    }

    // Column widths have to be adjusted before calling CheckClipping.
    // CheckClipping can cause the formatting of the lower frames
    // which still have a width of 0.
    const bool bHasColumns = Lower() && Lower()->IsColumnFrame();
    if ( bHasColumns && Lower()->GetNext() )
        AdjustColumns( nullptr, false );

    if( GetUpper() )
    {
        const tools::Long nWidth = aRectFnSet.GetWidth(GetUpper()->getFramePrintArea());

        {
            SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
            aRectFnSet.SetWidth( aFrm, nWidth );
        }

        // #109700# LRSpace for sections
        {
            const SvxLRSpaceItem& rLRSpace = GetFormat()->GetLRSpace();
            SwFrameAreaDefinition::FramePrintAreaWriteAccess aPrt(*this);
            aRectFnSet.SetWidth( aPrt, nWidth - rLRSpace.GetLeft() - rLRSpace.GetRight() );
        }

        // OD 15.10.2002 #103517# - allow grow in online layout
        // Thus, set <..IsBrowseMode()> as parameter <bGrow> on calling
        // method <CheckClipping(..)>.
        const SwViewShell *pSh = getRootFrame()->GetCurrShell();
        CheckClipping( pSh && pSh->GetViewOptions()->getBrowseMode(), bMaximize );
        bMaximize = ToMaximize( false );
        setFrameAreaSizeValid(true);
    }

    // Check the width of the columns and adjust if necessary
    if ( bHasColumns && ! Lower()->GetNext() && bMaximize )
        static_cast<SwColumnFrame*>(Lower())->Lower()->Calc(pRenderContext);

    if ( !bMaximize )
    {
        SwTwips nRemaining = aRectFnSet.GetTopMargin(*this);
        SwFrame *pFrame = m_pLower;
        if( pFrame )
        {
            if( pFrame->IsColumnFrame() && pFrame->GetNext() )
            {
                // #i61435#
                // suppress formatting, if upper frame has height <= 0
                if ( aRectFnSet.GetHeight(GetUpper()->getFrameArea()) > 0 )
                {
                    FormatWidthCols( *pAttr, nRemaining, MINLAY );
                }
                // #126020# - adjust check for empty section
                // #130797# - correct fix #126020#
                while( HasFollow() && !GetFollow()->ContainsContent() &&
                       !GetFollow()->ContainsAny( true ) )
                {
                    SwFrame* pOld = GetFollow();
                    GetFollow()->DelEmpty( false );
                    if( pOld == GetFollow() )
                        break;
                }
                bMaximize = ToMaximize( false );
                nRemaining += aRectFnSet.GetHeight(pFrame->getFrameArea());
            }
            else
            {
                if( pFrame->IsColumnFrame() )
                {
                    pFrame->Calc(pRenderContext);
                    pFrame = static_cast<SwColumnFrame*>(pFrame)->Lower();
                    pFrame->Calc(pRenderContext);
                    pFrame = static_cast<SwLayoutFrame*>(pFrame)->Lower();
                    CalcFootnoteContent();
                }
                // If we are in a columned frame which calls a CalcContent
                // in the FormatWidthCols, the content might need calculating
                if( pFrame && !pFrame->isFrameAreaDefinitionValid() && IsInFly() &&
                    FindFlyFrame()->IsColLocked() )
                    ::CalcContent( this );
                nRemaining += InnerHeight();
                bMaximize = HasFollow();
            }
        }

        SwTwips nDiff = aRectFnSet.GetHeight(getFrameArea()) - nRemaining;
        if( nDiff < 0)
        {
            SwTwips nDeadLine = aRectFnSet.GetPrtBottom(*GetUpper());
            {
                tools::Long nBottom = aRectFnSet.GetBottom(getFrameArea());
                nBottom = aRectFnSet.YInc( nBottom, -nDiff );
                tools::Long nTmpDiff = aRectFnSet.YDiff( nBottom, nDeadLine );
                if( nTmpDiff > 0 )
                {
                    nTmpDiff = GetUpper()->Grow( nTmpDiff, true );
                    nDeadLine = aRectFnSet.YInc( nDeadLine, nTmpDiff );
                    nTmpDiff = aRectFnSet.YDiff( nBottom, nDeadLine );
                    if( nTmpDiff > 0 )
                        nDiff += nTmpDiff;
                    if( nDiff > 0 )
                        nDiff = 0;
                }
            }
        }
        if( nDiff )
        {
            tools::Long nTmp = nRemaining - aRectFnSet.GetHeight(getFrameArea());
            tools::Long nTop = aRectFnSet.GetTopMargin(*this);

            {
                SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
                aRectFnSet.AddBottom( aFrm, nTmp );
            }

            aRectFnSet.SetYMargins( *this, nTop, 0 );
            InvalidateNextPos();

            if (m_pLower && (!m_pLower->IsColumnFrame() || !m_pLower->GetNext()))
            {
                // If a single-column section just created the space that
                // was requested by the "undersized" paragraphs, then they
                // have to be invalidated and calculated, so they fully cover it
                pFrame = m_pLower;
                if( pFrame->IsColumnFrame() )
                {
                    pFrame->InvalidateSize_();
                    pFrame->InvalidatePos_();
                    pFrame->Calc(pRenderContext);
                    pFrame = static_cast<SwColumnFrame*>(pFrame)->Lower();
                    pFrame->Calc(pRenderContext);
                    pFrame = static_cast<SwLayoutFrame*>(pFrame)->Lower();
                    CalcFootnoteContent();
                }
                bool bUnderSz = false;
                while( pFrame )
                {
                    if( pFrame->IsTextFrame() && static_cast<SwTextFrame*>(pFrame)->IsUndersized() )
                    {
                        pFrame->Prepare( PrepareHint::AdjustSizeWithoutFormatting );
                        bUnderSz = true;
                    }
                    pFrame = pFrame->GetNext();
                }
                if( bUnderSz && !IsContentLocked() )
                    ::CalcContent( this );
            }
        }
    }

    // Do not exceed the lower edge of the Upper.
    // Do not extend below the lower edge with Sections with Follows
    if ( GetUpper() )
        CheckClipping( true, bMaximize );
    if( !bOldLock )
        ColUnlock();
    tools::Long nDiff = nOldHeight - aRectFnSet.GetHeight(getFrameArea());

    if( nDiff > 0 )
    {
        if( !GetNext() )
            SetRetouche(); // Take over the retouching ourselves
        if( GetUpper() && !GetUpper()->IsFooterFrame() )
            GetUpper()->Shrink( nDiff );
    }

    if( IsUndersized() )
    {
        setFramePrintAreaValid(true);
    }

}

SwLayoutFrame *SwFrame::GetNextSctLeaf( MakePageType eMakePage )
{
    // Attention: Nested sections are currently not supported

    PROTOCOL_ENTER( this, PROT::Leaf, DbgAction::NextSect, GetUpper()->FindSctFrame() )

    // Shortcuts for "columned" sections, if we're not in the last column
    // Can we slide to the next column of the section?
    if( IsColBodyFrame() && GetUpper()->GetNext() )
        return static_cast<SwLayoutFrame*>(static_cast<SwLayoutFrame*>(GetUpper()->GetNext())->Lower());
    if( GetUpper()->IsColBodyFrame() && GetUpper()->GetUpper()->GetNext() )
        return static_cast<SwLayoutFrame*>(static_cast<SwLayoutFrame*>(GetUpper()->GetUpper()->GetNext())->Lower());
    // Inside a table-in-section, or sections of headers/footers, there can be only
    // one column shift be made, one of the above shortcuts should have applied!
    if( !CanContainSplitSection(GetUpper()) || FindFooterOrHeader() )
        return nullptr;

    SwSectionFrame *pSect = FindSctFrame();
    bool bWrongPage = false;
    assert(pSect && "GetNextSctLeaf: Missing SectionFrame");

    // Shortcut for sections with Follows. That's ok,
    // if no columns or pages (except dummy pages) lie in between.
    // In case of linked frames and in footnotes the shortcut would get
    // even more costly
    if( pSect->HasFollow() && pSect->IsInDocBody() && !pSect->IsInTab() )
    {
        if( pSect->GetFollow() == pSect->GetNext() )
        {
            SwPageFrame *pPg = pSect->GetFollow()->FindPageFrame();
            if( WrongPageDesc( pPg ) )
                bWrongPage = true;
            else
                return FirstLeaf( pSect->GetFollow() );
        }
        else
        {
            SwFrame* pTmp;
            if( !pSect->GetUpper()->IsColBodyFrame() ||
                nullptr == ( pTmp = pSect->GetUpper()->GetUpper()->GetNext() ) )
                pTmp = pSect->FindPageFrame()->GetNext();
            if( pTmp ) // is now the next column or page
            {
                SwFrame* pTmpX = pTmp;
                if( pTmp->IsPageFrame() && static_cast<SwPageFrame*>(pTmp)->IsEmptyPage() )
                    pTmp = pTmp->GetNext(); // skip dummy pages
                SwFrame *pUp = pSect->GetFollow()->GetUpper();
                // pUp becomes the next column if the Follow lies in a column
                // that is not a "not first" one, otherwise the page
                if( !pUp->IsColBodyFrame() ||
                    !( pUp = pUp->GetUpper() )->GetPrev() )
                    pUp = pUp->FindPageFrame();
                // Now pUp and pTmp have to be the same page/column, otherwise
                // pages or columns lie between Master and Follow
                if( pUp == pTmp || pUp->GetNext() == pTmpX )
                {
                    SwPageFrame* pNxtPg = pUp->IsPageFrame() ?
                                        static_cast<SwPageFrame*>(pUp) : pUp->FindPageFrame();
                    if( WrongPageDesc( pNxtPg ) )
                        bWrongPage = true;
                    else
                        return FirstLeaf( pSect->GetFollow() );
                }
            }
        }
    }

#ifndef NDEBUG
    std::vector<SwFrame *> parents;
    for (SwFrame * pTmp = GetUpper(); pTmp && !pTmp->IsPageFrame(); pTmp = pTmp->GetUpper())
    {
        parents.push_back(pTmp);
    }
#endif

    // Always end up in the same section: Body again inside Body etc.
    const bool bBody = IsInDocBody();
    const bool bFootnotePage = FindPageFrame()->IsFootnotePage();

    // The "pLayLeaf is in a table" case is rejected by default, so that it
    // can't happen that we try to move a table to one of its own cells.
    bool bLayLeafTableAllowed = false;
    SwLayoutFrame *pLayLeaf;

    SwLayoutFrame* pCellLeaf = nullptr;
    if (GetUpper()->IsInTab())
    {
        if (IsTabFrame())
        {
            return nullptr; // table in section in table: split disabled for now
        }
        // We are *in* a table (not an outermost SwTabFrame), see if there
        // is a follow cell frame created already.
        pCellLeaf = GetNextCellLeaf();
        if (!pCellLeaf)
        {
            SAL_WARN("sw.layout", "section is in table, but the table is not split");
            return nullptr;
        }
    }

    // A shortcut for TabFrames such that not all cells need to be visited
    if( bWrongPage )
        pLayLeaf = nullptr;
    else if( IsTabFrame() )
    {
        SwFrame *const pTmpCnt = static_cast<SwTabFrame*>(this)->FindLastContentOrTable();
        pLayLeaf = pTmpCnt ? pTmpCnt->GetUpper() : nullptr;
    }
    else if (pCellLeaf && CanContainSplitSection(this))
    {
        // This frame is in a table-not-in-section, its follow should be
        // inserted under the follow of the frame's cell.
        pLayLeaf = pCellLeaf;
        if (pLayLeaf->FindTabFrame() == FindTabFrame())
            SAL_WARN("sw.layout", "my table frame and my follow's table frame is the same");
        // In this case pLayLeaf pointing to an in-table frame is OK.
        bLayLeafTableAllowed = true;
    }
    else
    {
        pLayLeaf = GetNextLayoutLeaf();
        if( IsColumnFrame() )
        {
            while( pLayLeaf && static_cast<SwColumnFrame*>(this)->IsAnLower( pLayLeaf ) )
                pLayLeaf = pLayLeaf->GetNextLayoutLeaf();
        }
    }

    SwLayoutFrame *pOldLayLeaf = nullptr;           // Such that in case of newly
                                            // created pages, the search is
                                            // not started over at the beginning

    while( true )
    {
        if( pLayLeaf )
        {
            // A layout leaf was found, let's see whether it can store me or
            // another SectionFrame can be inserted here, or we have to continue
            // searching
            SwPageFrame* pNxtPg = pLayLeaf->FindPageFrame();
            if ( !bFootnotePage && pNxtPg->IsFootnotePage() )
            {   // If I reached the end note pages it's over
                pLayLeaf = nullptr;
                continue;
            }
            // Once inBody always inBody, don't step into tables-in-sections and not into other sections
            if ( (bBody && !pLayLeaf->IsInDocBody()) ||
                 (IsInFootnote() != pLayLeaf->IsInFootnote() ) ||
                 (pLayLeaf->IsInTab() && !bLayLeafTableAllowed) ||
                 ( pLayLeaf->IsInSct() && ( !pSect->HasFollow()
                   || pSect->GetFollow() != pLayLeaf->FindSctFrame() ) ) )
            {
                // Rejected - try again.
                pOldLayLeaf = pLayLeaf;
                pLayLeaf = pLayLeaf->GetNextLayoutLeaf();
                continue;
            }
            // Page desc is never wrong in case of sections-in-tables: in that
            // case pLayLeaf points to our section's cell's follow, which is
            // fine to be on the same page. New page creation is handled when
            // creating / moving the cell frame.
            if( WrongPageDesc( pNxtPg ) && !bLayLeafTableAllowed )
            {
                if( bWrongPage )
                    break; // there's a column between me and my right page
                pLayLeaf = nullptr;
                bWrongPage = true;
                pOldLayLeaf = nullptr;
                continue;
            }
        }
        // There is no further LayoutFrame that fits, so a new page
        // has to be created, although new pages are worthless within a frame
        else if( !pSect->IsInFly() &&
            ( eMakePage == MAKEPAGE_APPEND || eMakePage == MAKEPAGE_INSERT ) )
        {
            InsertPage(pOldLayLeaf ? pOldLayLeaf->FindPageFrame() : FindPageFrame(),
                       false );
            // and again the whole thing
            if (pCellLeaf && CanContainSplitSection(this))
                // GetNextLayoutLeaf() would refer to the next cell in the same
                // row, avoid that. pCellLeaf points to the correct cell in the
                // follow table, and in the next round it'll be used, as we now
                // have a next page.
                pLayLeaf = pCellLeaf;
            else
                pLayLeaf = pOldLayLeaf ? pOldLayLeaf : GetNextLayoutLeaf();
            continue;
        }
        break;
    }

    if( pLayLeaf )
    {
        // We have found the suitable layout sheet. If there (in the sheet) is
        // already a Follow of our section, we take its first layout sheet,
        // otherwise it is time to create a section follow
        SwSectionFrame* pNew = nullptr;

        // This can be omitted if existing Follows were cut short
        SwFrame* pFirst = pLayLeaf->Lower();
        // Here SectionFrames that are to be deleted must be ignored
        while( pFirst && pFirst->IsSctFrame() && !static_cast<SwSectionFrame*>(pFirst)->GetSection() )
            pFirst = pFirst->GetNext();
        if( pFirst && pFirst->IsSctFrame() && pSect->GetFollow() == pFirst )
            pNew = pSect->GetFollow();
        else if( MAKEPAGE_NOSECTION == eMakePage )
            return pLayLeaf;
        else if (pSect->GetSection())
        {
            pNew = new SwSectionFrame( *pSect, false );
            pNew->InsertBefore( pLayLeaf, pLayLeaf->Lower() );
            pNew->Init();
            SwRectFnSet aRectFnSet(pNew);
            aRectFnSet.MakePos( *pNew, pLayLeaf, nullptr, true );

#ifndef NDEBUG
            {   // sanity check the parents of the new frame vs. the old frame
                SwFrame * pTmp = pNew;
                auto iter(parents.begin());
                if (parents.size() >= 2 &&
                    parents[0]->IsBodyFrame() && parents[1]->IsColumnFrame())
                {   // this only inserts section frame - remove column
                    assert(parents[2]->IsSctFrame() || IsSctFrame());
                    if (parents[2]->IsSctFrame())
                        std::advance(iter, +2);
                    else
                        pTmp = pTmp->GetUpper();
                }
                else if (IsBodyFrame() && parents.size() >= 1
                         && parents[0]->IsColumnFrame())
                {   // same as above, special case: "this" is the body frame
                    assert(parents[1]->IsSctFrame());
                    std::advance(iter, +1);
                }
                else  if (IsSctFrame()) // special case: "this" is the section
                {
                    pTmp = pTmp->GetUpper();
                }

                for ( ; iter != parents.end(); ++iter)
                {
                    if (pTmp->IsPageFrame())
                    {
                        if ((*iter)->IsColumnFrame() &&
                            (iter + 1) != parents.end() && (*(iter + 1))->IsBodyFrame())
                        {   // page style has columns - evidently these are
                            break; // added later?
                        }
                        assert(!pTmp->IsPageFrame());
                    }
                    assert(pTmp->GetType() == (*iter)->GetType());
                    // for cell frames and table frames:
                    // 1) there may be multiple follow frames of the old one
                    // 2) the new frame may be identical to the old one
                    //    (not sure if this is allowed, but it happens now
                    //     for the outer table of a nested table)
                    if (pTmp->IsCellFrame())
                    {
                        SwCellFrame const*const pNewF(static_cast<SwCellFrame*>(pTmp));
                        SwCellFrame const*const pOldF(static_cast<SwCellFrame*>(*iter));
                        bool bFollowFound(false);
                        for (SwCellFrame const* pOldIter = pOldF;
                            pOldIter; pOldIter = pOldIter->GetFollowCell())
                        {
                            if (pOldIter == pNewF)
                            {
                                bFollowFound = true;
                                break;
                            }
                        }
                        assert(bFollowFound);
                    }
                    else if (pTmp->IsFlowFrame())
                    {
                        SwFlowFrame const*const pNewF(SwFlowFrame::CastFlowFrame(pTmp));
                        SwFlowFrame const*const pOldF(SwFlowFrame::CastFlowFrame(*iter));
                        bool bFollowFound(false);
                        for (SwFlowFrame const* pOldIter = pOldF;
                            pOldIter; pOldIter = pOldIter->GetFollow())
                        {
                            if (pOldIter == pNewF)
                            {
                                bFollowFound = true;
                                break;
                            }
                        }
                        assert(bFollowFound);
                    }
                    pTmp = pTmp->GetUpper();
                }
                assert(pTmp == nullptr /* SwFlyAtContentFrame case */
                    || pTmp->IsPageFrame() // usual case
                       // the new page has columns, but the old page did not
                    || (pTmp->IsColumnFrame() && pTmp->GetUpper()->IsBodyFrame()
                        && pTmp->GetUpper()->GetUpper()->IsPageFrame()));
            }
#endif

            // If our section frame has a successor then that has to be
            // moved behind the new Follow of the section frames
            SwFrame* pTmp = pSect->GetNext();
            if( pTmp && pTmp != pSect->GetFollow() )
            {
                SwFlowFrame* pNxt;
                SwContentFrame* pNxtContent = nullptr;
                if( pTmp->IsContentFrame() )
                {
                    pNxt = static_cast<SwContentFrame*>(pTmp);
                    pNxtContent = static_cast<SwContentFrame*>(pTmp);
                }
                else
                {
                    pNxtContent = static_cast<SwLayoutFrame*>(pTmp)->ContainsContent();
                    if( pTmp->IsSctFrame() )
                        pNxt = static_cast<SwSectionFrame*>(pTmp);
                    else
                    {
                        assert(pTmp->IsTabFrame());
                        pNxt = static_cast<SwTabFrame*>(pTmp);
                    }
                    while( !pNxtContent && nullptr != ( pTmp = pTmp->GetNext() ) )
                    {
                        if( pTmp->IsContentFrame() )
                            pNxtContent = static_cast<SwContentFrame*>(pTmp);
                        else
                            pNxtContent = static_cast<SwLayoutFrame*>(pTmp)->ContainsContent();
                    }
                }
                if( pNxtContent )
                {
                    SwFootnoteBossFrame* pOldBoss = pSect->FindFootnoteBossFrame( true );
                    if( pOldBoss == pNxtContent->FindFootnoteBossFrame( true ) )
                    {
                        SwSaveFootnoteHeight aHeight( pOldBoss,
                            pOldBoss->getFrameArea().Top() + pOldBoss->getFrameArea().Height() );
                        pSect->GetUpper()->MoveLowerFootnotes( pNxtContent, pOldBoss,
                                    pLayLeaf->FindFootnoteBossFrame( true ), false );
                    }
                }
                pNxt->MoveSubTree( pLayLeaf, pNew->GetNext() );
            }
            if( pNew->GetFollow() )
                pNew->SimpleFormat();
        }
        // The wanted layout sheet is now the first of the determined SctFrames:
        pLayLeaf = pNew ? FirstLeaf(pNew) : nullptr;
    }
    return pLayLeaf;
}

SwLayoutFrame *SwFrame::GetPrevSctLeaf()
{
    PROTOCOL_ENTER( this, PROT::Leaf, DbgAction::PrevSect, GetUpper()->FindSctFrame() )

    SwLayoutFrame* pCol;
    // ColumnFrame always contain a BodyFrame now
    if( IsColBodyFrame() )
        pCol = GetUpper();
    else if( GetUpper()->IsColBodyFrame() )
        pCol = GetUpper()->GetUpper();
    else
        pCol = nullptr;
    bool bJump = false;
    if( pCol )
    {
        if( pCol->GetPrev() )
        {
            do
            {
                pCol = static_cast<SwLayoutFrame*>(pCol->GetPrev());
                // Is there any content?
                if( static_cast<SwLayoutFrame*>(pCol->Lower())->Lower() )
                {
                    if( bJump )     // Did we skip a blank page?
                        SwFlowFrame::SetMoveBwdJump( true );
                    return static_cast<SwLayoutFrame*>(pCol->Lower());  // The columnm body
                }
                bJump = true;
            } while( pCol->GetPrev() );

            // We get here when all columns are empty, pCol is now the
            // first column, we need the body though
            pCol = static_cast<SwLayoutFrame*>(pCol->Lower());
        }
        else
            pCol = nullptr;
    }

    if( bJump )     // Did we skip a blank page?
        SwFlowFrame::SetMoveBwdJump( true );

    SwSectionFrame *pSect = FindSctFrame();
    if (!pCol && pSect && IsInTab() && CanContainSplitSection(this))
    {
        // We don't have a previous section yet, and we're in a
        // section-in-table.
        if (SwFlowFrame* pPrecede = pSect->GetPrecede())
        {
            // Our section has a precede, work with that.
            if (pPrecede->GetFrame().IsLayoutFrame())
                pCol = static_cast<SwLayoutFrame*>(&pPrecede->GetFrame());
        }
    }

    // Within sections in tables or section in headers/footers there can
    // be only one column change be made, one of the above shortcuts should
    // have applied, also when the section has a pPrev.
    // Now we even consider an empty column...
    OSL_ENSURE( pSect, "GetNextSctLeaf: Missing SectionFrame" );
    if (!pSect || (IsInTab() && !IsTabFrame()) || FindFooterOrHeader())
        return pCol;

    // === IMPORTANT ===
    // Precondition, which needs to be hold, is that the <this> frame can be
    // inside a table, but then the found section frame <pSect> is also inside
    // this table.

    // #i95698#
    // A table cell containing directly a section does not break - see lcl_FindSectionsInRow(..)
    // Thus, a table inside a section, which is inside another table can only
    // flow backward in the columns of its section.
    // Note: The table cell, which contains the section, can not have a master table cell.
    if ( IsTabFrame() && pSect->IsInTab() )
    {
        return pCol;
    }

    {
        if (SwFrame *pPrv = pSect->GetIndPrev())
        {
            // Mooching, half dead SectionFrames shouldn't confuse us
            while( pPrv && pPrv->IsSctFrame() && !static_cast<SwSectionFrame*>(pPrv)->GetSection() )
                pPrv = pPrv->GetPrev();
            if( pPrv )
                return pCol;
        }
    }

    const bool bBody = IsInDocBody();
    const bool bFly  = IsInFly();

    SwLayoutFrame *pLayLeaf = GetPrevLayoutLeaf();
    SwLayoutFrame *pPrevLeaf = nullptr;

    while ( pLayLeaf )
    {
        // Never step into tables or sections
        if ( pLayLeaf->IsInTab() || pLayLeaf->IsInSct() )
        {
            pLayLeaf = pLayLeaf->GetPrevLayoutLeaf();
        }
        else if ( bBody && pLayLeaf->IsInDocBody() )
        {
            // If there is a pLayLeaf has a lower pLayLeaf is the frame we are looking for.
            // Exception: pLayLeaf->Lower() is a zombie section frame
            const SwFrame* pTmp = pLayLeaf->Lower();
            // OD 11.04.2003 #108824# - consider, that the zombie section frame
            // can have frame below it in the found layout leaf.
            // Thus, skipping zombie section frame, if possible.
            while ( pTmp && pTmp->IsSctFrame() &&
                    !( static_cast<const SwSectionFrame*>(pTmp)->GetSection() ) &&
                    pTmp->GetNext()
                  )
            {
                pTmp = pTmp->GetNext();
            }
            if ( pTmp &&
                 ( !pTmp->IsSctFrame() ||
                   ( static_cast<const SwSectionFrame*>(pTmp)->GetSection() )
                 )
               )
            {
                break;
            }
            pPrevLeaf = pLayLeaf;
            pLayLeaf = pLayLeaf->GetPrevLayoutLeaf();
            if ( pLayLeaf )
                SwFlowFrame::SetMoveBwdJump( true );
        }
        else if ( bFly )
            break;  // Contents in Flys every layout sheet should be right. Why?
        else
            pLayLeaf = pLayLeaf->GetPrevLayoutLeaf();
    }
    if( !pLayLeaf )
    {
        if( !pPrevLeaf )
            return pCol;
        pLayLeaf = pPrevLeaf;
    }

    SwSectionFrame* pNew = nullptr;
    // At first go to the end of the layout sheet
    SwFrame *pTmp = pLayLeaf->Lower();
    if( pTmp )
    {
        while( pTmp->GetNext() )
            pTmp = pTmp->GetNext();
        if( pTmp->IsSctFrame() )
        {
            // Half dead ones only interfere here
            while( !static_cast<SwSectionFrame*>(pTmp)->GetSection() && pTmp->GetPrev() &&
                    pTmp->GetPrev()->IsSctFrame() )
                pTmp = pTmp->GetPrev();
            if( static_cast<SwSectionFrame*>(pTmp)->GetFollow() == pSect )
                pNew = static_cast<SwSectionFrame*>(pTmp);
        }
    }
    if( !pNew )
    {
        pNew = new SwSectionFrame( *pSect, true );
        pNew->InsertBefore( pLayLeaf, nullptr );
        pNew->Init();
        SwRectFnSet aRectFnSet(pNew);
        aRectFnSet.MakePos( *pNew, pLayLeaf, pNew->GetPrev(), true );

        pLayLeaf = FirstLeaf( pNew );
        if( !pNew->Lower() )    // Format single column sections
        {
            pNew->MakePos();
            pLayLeaf->Format(getRootFrame()->GetCurrShell()->GetOut()); // In order that the PrtArea is correct for the MoveBwd
        }
        else
            pNew->SimpleFormat();
    }
    else
    {
        pLayLeaf = FirstLeaf( pNew );
        if( pLayLeaf->IsColBodyFrame() )
        {
            // In existent section columns we're looking for the last not empty
            // column.
            SwLayoutFrame *pTmpLay = pLayLeaf;
            while( pLayLeaf->GetUpper()->GetNext() )
            {
                pLayLeaf = static_cast<SwLayoutFrame*>(static_cast<SwLayoutFrame*>(pLayLeaf->GetUpper()->GetNext())->Lower());
                if( pLayLeaf->Lower() )
                    pTmpLay = pLayLeaf;
            }
            // If we skipped an empty column, we've to set the jump-flag
            if( pLayLeaf != pTmpLay )
            {
                pLayLeaf = pTmpLay;
                SwFlowFrame::SetMoveBwdJump( true );
            }
        }
    }
    return pLayLeaf;
}

static SwTwips lcl_DeadLine( const SwFrame* pFrame )
{
    const SwLayoutFrame* pUp = pFrame->GetUpper();
    while( pUp && pUp->IsInSct() )
    {
        if( pUp->IsSctFrame() )
            pUp = pUp->GetUpper();
        // Columns now with BodyFrame
        else if( pUp->IsColBodyFrame() && pUp->GetUpper()->GetUpper()->IsSctFrame() )
            pUp = pUp->GetUpper()->GetUpper();
        else
            break;
    }
    SwRectFnSet aRectFnSet(pFrame);
    return pUp ? aRectFnSet.GetPrtBottom(*pUp) :
                 aRectFnSet.GetBottom(pFrame->getFrameArea());
}

bool SwSectionFrame::Growable() const
{
    SwRectFnSet aRectFnSet(this);
    if( aRectFnSet.YDiff( lcl_DeadLine( this ),
        aRectFnSet.GetBottom(getFrameArea()) ) > 0 )
        return true;

    return ( GetUpper() && const_cast<SwFrame*>(static_cast<SwFrame const *>(GetUpper()))->Grow( LONG_MAX, true ) );
}

SwTwips SwSectionFrame::Grow_( SwTwips nDist, bool bTst )
{
    if ( !IsColLocked() && !HasFixSize() )
    {
        SwRectFnSet aRectFnSet(this);
        tools::Long nFrameHeight = aRectFnSet.GetHeight(getFrameArea());
        if( nFrameHeight > 0 && nDist > (LONG_MAX - nFrameHeight) )
            nDist = LONG_MAX - nFrameHeight;

        if ( nDist <= 0 )
            return 0;

        bool bInCalcContent = GetUpper() && IsInFly() && FindFlyFrame()->IsLocked();
        // OD 2004-03-15 #116561# - allow grow in online layout
        bool bGrow = !Lower() || !Lower()->IsColumnFrame() || !Lower()->GetNext();
        if (!bGrow)
        {
            SwSection* pSection = GetSection();
            bGrow = pSection && pSection->GetFormat()->GetBalancedColumns().GetValue();
        }
        if( !bGrow )
        {
             const SwViewShell *pSh = getRootFrame()->GetCurrShell();
             bGrow = pSh && pSh->GetViewOptions()->getBrowseMode();
        }
        if( bGrow )
        {
            SwTwips nGrow;
            if( IsInFootnote() )
                nGrow = 0;
            else
            {
                nGrow = lcl_DeadLine( this );
                nGrow = aRectFnSet.YDiff( nGrow, aRectFnSet.GetBottom(getFrameArea()) );
            }
            SwTwips nSpace = nGrow;
            if( !bInCalcContent && nGrow < nDist && GetUpper() )
                nGrow = o3tl::saturating_add(
                    nGrow, GetUpper()->Grow( LONG_MAX, true ));

            if( nGrow > nDist )
                nGrow = nDist;
            if( nGrow <= 0 )
            {
                nGrow = 0;
                if (!bTst)
                {
                    if( bInCalcContent )
                        InvalidateSize_();
                    else
                        InvalidateSize();
                }
            }
            else if( !bTst )
            {
                if( bInCalcContent )
                    InvalidateSize_();
                else if( nSpace < nGrow &&  nDist != nSpace + GetUpper()->
                         Grow( nGrow - nSpace ) )
                    InvalidateSize();
                else
                {
                    const SvxGraphicPosition ePos =
                        GetAttrSet()->GetBackground().GetGraphicPos();
                    if ( GPOS_RT < ePos && GPOS_TILED != ePos )
                    {
                        SetCompletePaint();
                        InvalidatePage();
                    }
                    if( GetUpper() && GetUpper()->IsHeaderFrame() )
                        GetUpper()->InvalidateSize();
                }

                {
                    SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
                    aRectFnSet.AddBottom( aFrm, nGrow );
                }

                {
                    const tools::Long nPrtHeight = aRectFnSet.GetHeight(getFramePrintArea()) + nGrow;
                    SwFrameAreaDefinition::FramePrintAreaWriteAccess aPrt(*this);
                    aRectFnSet.SetHeight( aPrt, nPrtHeight );
                }

                if( Lower() && Lower()->IsColumnFrame() && Lower()->GetNext() )
                {
                    SwFrame* pTmp = Lower();
                    do
                    {
                        pTmp->InvalidateSize_();
                        pTmp = pTmp->GetNext();
                    } while ( pTmp );
                    InvalidateSize_();
                }
                if( GetNext() )
                {
                    // Own height changed, need to invalidate the position of
                    // next frames.
                    SwFrame *pFrame = GetNext();
                    while( pFrame && pFrame->IsSctFrame() && !static_cast<SwSectionFrame*>(pFrame)->GetSection() )
                    {
                        // Invalidate all in-between frames, otherwise position
                        // calculation (which only looks back to one relative
                        // frame) will have an incorrect result.
                        InvalidateFramePos(pFrame, bInCalcContent);
                        pFrame = pFrame->GetNext();
                    }
                    if( pFrame )
                    {
                        InvalidateFramePos(pFrame, bInCalcContent);
                    }
                }
                // #i28701# - Due to the new object positioning
                // the frame on the next page/column can flow backward (e.g. it
                // was moved forward due to the positioning of its objects ).
                // Thus, invalivate this next frame, if document compatibility
                // option 'Consider wrapping style influence on object positioning' is ON.
                else if ( GetFormat()->getIDocumentSettingAccess().get(DocumentSettingId::CONSIDER_WRAP_ON_OBJECT_POSITION) )
                {
                    InvalidateNextPos();
                }
            }
            return nGrow;
        }
        if ( !bTst )
        {
            if( bInCalcContent )
                InvalidateSize_();
            else
                InvalidateSize();
        }
    }
    return 0;
}

SwTwips SwSectionFrame::Shrink_( SwTwips nDist, bool bTst )
{
    if ( Lower() && !IsColLocked() && !HasFixSize() )
    {
        if( ToMaximize( false ) )
        {
            if( !bTst )
                InvalidateSize();
        }
        else
        {
            SwRectFnSet aRectFnSet(this);
            tools::Long nFrameHeight = aRectFnSet.GetHeight(getFrameArea());
            if ( nDist > nFrameHeight )
                nDist = nFrameHeight;

            if ( Lower()->IsColumnFrame() && Lower()->GetNext() && // FootnoteAtEnd
                 !GetSection()->GetFormat()->GetBalancedColumns().GetValue() )
            {   // With column bases the format takes over the control of the
                // growth (because of the balance)
                if ( !bTst )
                    InvalidateSize();
                return nDist;
            }
            else if( !bTst )
            {
                const SvxGraphicPosition ePos =
                    GetAttrSet()->GetBackground().GetGraphicPos();
                if ( GPOS_RT < ePos && GPOS_TILED != ePos )
                {
                    SetCompletePaint();
                    InvalidatePage();
                }

                {
                    SwFrameAreaDefinition::FrameAreaWriteAccess aFrm(*this);
                    aRectFnSet.AddBottom( aFrm, -nDist );
                }

                {
                    const tools::Long nPrtHeight = aRectFnSet.GetHeight(getFramePrintArea()) - nDist;
                    SwFrameAreaDefinition::FramePrintAreaWriteAccess aPrt(*this);
                    aRectFnSet.SetHeight( aPrt, nPrtHeight );
                }

                // We do not allow a section frame to shrink the its upper
                // footer frame. This is because in the calculation of a
                // footer frame, the content of the section frame is _not_
                // calculated. If there is a fly frame overlapping with the
                // footer frame, the section frame is not affected by this
                // during the calculation of the footer frame size.
                // The footer frame does not grow in its FormatSize function
                // but during the calculation of the content of the section
                // frame. The section frame grows until some of its text is
                // located on top of the fly frame. The next call of CalcContent
                // tries to shrink the section and here it would also shrink
                // the footer. This may not happen, because shrinking the footer
                // would cause the top of the section frame to overlap with the
                // fly frame again, this would result in a perfect loop.
                if( GetUpper() && !GetUpper()->IsFooterFrame() )
                    GetUpper()->Shrink( nDist, bTst );

                if( Lower() && Lower()->IsColumnFrame() && Lower()->GetNext() )
                {
                    SwFrame* pTmp = Lower();
                    do
                    {
                        pTmp->InvalidateSize_();
                        pTmp = pTmp->GetNext();
                    } while ( pTmp );
                }
                if( GetNext() )
                {
                    SwFrame* pFrame = GetNext();
                    while( pFrame && pFrame->IsSctFrame() && !static_cast<SwSectionFrame*>(pFrame)->GetSection() )
                        pFrame = pFrame->GetNext();
                    if( pFrame )
                        pFrame->InvalidatePos();
                    else
                        SetRetouche();
                }
                else
                    SetRetouche();
                return nDist;
            }
        }
    }
    return 0;
}

/*
|*  When are Frames within a SectionFrames moveable?
|*  If they are not in the last column of a SectionFrames yet,
|*  if there is no Follow,
|*  if the SectionFrame cannot grow anymore, then it gets more complicated,
|*  in that case it depends on whether the SectionFrame can find a next
|*  layout sheet. In (column based/chained) Flys this is checked via
|*  GetNextLayout, in tables and headers/footers there is none, however in the
|*  DocBody and in foot notes there is always one.
|*
|*  This routine is used in the TextFormatter to decided whether it's allowed to
|*  create a (paragraph-)Follow or whether the paragraph has to stick together
|*/
bool SwSectionFrame::MoveAllowed( const SwFrame* pFrame) const
{
    // Is there a Follow or is the Frame not in the last column?
    if( HasFollow() || ( pFrame->GetUpper()->IsColBodyFrame() &&
        pFrame->GetUpper()->GetUpper()->GetNext() ) )
        return true;
    if( pFrame->IsInFootnote() )
    {
        if( IsInFootnote() )
        {
            if( GetUpper()->IsInSct() )
            {
                if( Growable() )
                    return false;
                return GetUpper()->FindSctFrame()->MoveAllowed( this );
            }
            else
                return true;
        }
        // The content of footnote inside a columned sectionfrm is moveable
        // except in the last column
        const SwLayoutFrame *pLay = pFrame->FindFootnoteFrame()->GetUpper()->GetUpper();
        if( pLay->IsColumnFrame() && pLay->GetNext() )
        {
            // The first paragraph in the first footnote in the first column
            // in the sectionfrm at the top of the page is not moveable,
            // if the columnbody is empty.
            bool bRet = false;
            if( pLay->GetIndPrev() || pFrame->GetIndPrev() ||
                pFrame->FindFootnoteFrame()->GetPrev() )
                bRet = true;
            else
            {
                const SwLayoutFrame* pBody = static_cast<const SwColumnFrame*>(pLay)->FindBodyCont();
                if( pBody && pBody->Lower() )
                    bRet = true;
            }
            if( bRet && ( IsFootnoteAtEnd() || !Growable() ) )
                return true;
        }
    }
    // Or can the section still grow?
    if( !IsColLocked() && Growable() )
        return false;
    // Now it has to be examined whether there is a layout sheet wherein
    // a section Follow can be created
    if( !CanContainSplitSection(this) || ( !IsInDocBody() && FindFooterOrHeader() ) )
        return false; // It doesn't work in table-in-sections/nested tables/headers/footers
    if( IsInFly() ) // In column based or chained frames
        return nullptr != const_cast<SwFrame*>(static_cast<SwFrame const *>(GetUpper()))->GetNextLeaf( MAKEPAGE_NONE );
    return true;
}

SwFrame* SwFrame::GetIndPrev_() const
{
    SwFrame *pRet = nullptr;
    // #i79774#
    // Do not assert, if the frame has a direct previous frame, because it
    // could be an empty section frame. The caller has to assure, that the
    // frame has no direct previous frame or only empty section frames as
    // previous frames.
    OSL_ENSURE(  IsInSct(), "Why?" );
    const SwFrame* pSct = GetUpper();
    if( !pSct )
        return nullptr;
    if( pSct->IsSctFrame() )
        pRet = pSct->GetIndPrev();
    else if( pSct->IsColBodyFrame() && (pSct = pSct->GetUpper()->GetUpper())->IsSctFrame() )
    {
        // Do not return the previous frame of the outer section, if in one
        // of the previous columns is content.
        const SwFrame* pCol = GetUpper()->GetUpper()->GetPrev();
        while( pCol )
        {
            assert(pCol->IsColumnFrame());
            assert(pCol->GetLower() && pCol->GetLower()->IsBodyFrame());
            if( static_cast<const SwLayoutFrame*>(static_cast<const SwLayoutFrame*>(pCol)->Lower())->Lower() )
                return nullptr;
            pCol = pCol->GetPrev();
        }
        pRet = pSct->GetIndPrev();
    }

    // skip empty section frames
    while( pRet && pRet->IsSctFrame() && !static_cast<SwSectionFrame*>(pRet)->GetSection() )
        pRet = pRet->GetIndPrev();
    return pRet;
}

SwFrame* SwFrame::GetIndNext_()
{
    OSL_ENSURE( !mpNext && IsInSct(), "Why?" );
    SwFrame* pSct = GetUpper();
    if( !pSct )
        return nullptr;
    if( pSct->IsSctFrame() )
        return pSct->GetIndNext();
    if( pSct->IsColBodyFrame() && (pSct = pSct->GetUpper()->GetUpper())->IsSctFrame() )
    {   // We can only return the successor of the SectionFrames if there is no
        // content in the successive columns
        SwFrame* pCol = GetUpper()->GetUpper()->GetNext();
        while( pCol )
        {
            assert(pCol->IsColumnFrame());
            assert(pCol->GetLower() && pCol->GetLower()->IsBodyFrame());
            if( static_cast<SwLayoutFrame*>(static_cast<SwLayoutFrame*>(pCol)->Lower())->Lower() )
                return nullptr;
            pCol = pCol->GetNext();
        }
        return pSct->GetIndNext();
    }
    return nullptr;
}

bool SwSectionFrame::IsDescendantFrom( const SwSectionFormat* pFormat ) const
{
    if( !m_pSection || !pFormat )
        return false;
    const SwSectionFormat *pMyFormat = m_pSection->GetFormat();
    while( pFormat != pMyFormat )
    {
        if( auto pNewFormat = dynamic_cast< const SwSectionFormat *>( pMyFormat->GetRegisteredIn()) )
            pMyFormat = pNewFormat;
        else
            return false;
    }
    return true;
}

void SwSectionFrame::CalcFootnoteAtEndFlag()
{
    SwSectionFormat *pFormat = GetSection()->GetFormat();
    sal_uInt16 nVal = pFormat->GetFootnoteAtTextEnd( false ).GetValue();
    m_bFootnoteAtEnd = FTNEND_ATPGORDOCEND != nVal;
    m_bOwnFootnoteNum = FTNEND_ATTXTEND_OWNNUMSEQ == nVal ||
                 FTNEND_ATTXTEND_OWNNUMANDFMT == nVal;
    while( !m_bFootnoteAtEnd && !m_bOwnFootnoteNum )
    {
        if( auto pNewFormat = dynamic_cast<SwSectionFormat *>( pFormat->GetRegisteredIn()) )
            pFormat = pNewFormat;
        else
            break;
        nVal = pFormat->GetFootnoteAtTextEnd( false ).GetValue();
        if( FTNEND_ATPGORDOCEND != nVal )
        {
            m_bFootnoteAtEnd = true;
            m_bOwnFootnoteNum = m_bOwnFootnoteNum ||FTNEND_ATTXTEND_OWNNUMSEQ == nVal ||
                         FTNEND_ATTXTEND_OWNNUMANDFMT == nVal;
        }
    }
}

bool SwSectionFrame::IsEndnoteAtMyEnd() const
{
    return m_pSection->GetFormat()->GetEndAtTextEnd( false ).IsAtEnd();
}

void SwSectionFrame::CalcEndAtEndFlag()
{
    SwSectionFormat *pFormat = GetSection()->GetFormat();
    m_bEndnAtEnd = pFormat->GetEndAtTextEnd( false ).IsAtEnd();
    while( !m_bEndnAtEnd )
    {
        if( auto pNewFormat = dynamic_cast<SwSectionFormat *>( pFormat->GetRegisteredIn()) )
            pFormat = pNewFormat;
        else
            break;
        m_bEndnAtEnd = pFormat->GetEndAtTextEnd( false ).IsAtEnd();
    }
}

void SwSectionFrame::Notify(SfxHint const& rHint)
{
    SwSectionFormat *const pFormat(GetSection()->GetFormat());
    assert(pFormat);
    SwClientNotify(*pFormat, rHint);
}

void SwSectionFrame::SwClientNotify(const SwModify& rMod, const SfxHint& rHint)
{
    if (rHint.GetId() == SfxHintId::SwLegacyModify)
    {
        auto pLegacy = static_cast<const sw::LegacyModifyHint*>(&rHint);
        SwSectionFrameInvFlags eInvFlags = SwSectionFrameInvFlags::NONE;
        if(pLegacy->m_pNew && RES_ATTRSET_CHG == pLegacy->m_pNew->Which())
        {
            auto& rOldSetChg = *static_cast<const SwAttrSetChg*>(pLegacy->m_pOld);
            auto& rNewSetChg = *static_cast<const SwAttrSetChg*>(pLegacy->m_pNew);
            SfxItemIter aOIter(*rOldSetChg.GetChgSet());
            SfxItemIter aNIter(*rNewSetChg.GetChgSet());
            const SfxPoolItem* pOItem = aOIter.GetCurItem();
            const SfxPoolItem* pNItem = aNIter.GetCurItem();
            SwAttrSetChg aOldSet(rOldSetChg);
            SwAttrSetChg aNewSet(rNewSetChg);
            do
            {
                UpdateAttr_(pOItem, pNItem, eInvFlags, &aOldSet, &aNewSet);
                pNItem = aNIter.NextItem();
                pOItem = aOIter.NextItem();
            } while (pNItem);
            if(aOldSet.Count() || aNewSet.Count())
                SwLayoutFrame::SwClientNotify(rMod, sw::LegacyModifyHint(&aOldSet, &aNewSet));
        }
        else
            UpdateAttr_(pLegacy->m_pOld, pLegacy->m_pNew, eInvFlags);

        if (eInvFlags != SwSectionFrameInvFlags::NONE)
        {
            if(eInvFlags & SwSectionFrameInvFlags::InvalidateSize)
                InvalidateSize();
            if(eInvFlags & SwSectionFrameInvFlags::SetCompletePaint)
                SetCompletePaint();
        }
    }
    else if(const auto pHint = dynamic_cast<const SwSectionFrameMoveAndDeleteHint*>(&rHint))
    {
        // #i117863#
        if(&rMod != GetDep())
            return;
        SwSectionFrame::MoveContentAndDelete(this, pHint->IsSaveContent());
    }
    else
        SwFrame::SwClientNotify(rMod, rHint);
}

void SwSectionFrame::UpdateAttr_( const SfxPoolItem *pOld, const SfxPoolItem *pNew,
                            SwSectionFrameInvFlags &rInvFlags,
                            SwAttrSetChg *pOldSet, SwAttrSetChg *pNewSet )
{
    bool bClear = true;
    const sal_uInt16 nWhich = pOld ? pOld->Which() : pNew ? pNew->Which() : 0;
    switch( nWhich )
    {   // Suppress multi columns in foot notes
        case RES_FMT_CHG:
        {
            const SwFormatCol& rNewCol = GetFormat()->GetCol();
            if( !IsInFootnote() )
            {
                // Nasty case. When allocating a template we can not count
                // on the old column attribute. We're left with creating a
                // temporary attribute here.
                SwFormatCol aCol;
                if ( Lower() && Lower()->IsColumnFrame() )
                {
                    sal_uInt16 nCol = 0;
                    SwFrame *pTmp = Lower();
                    do
                    {   ++nCol;
                        pTmp = pTmp->GetNext();
                    } while ( pTmp );
                    aCol.Init( nCol, 0, 1000 );
                }
                bool bChgFootnote = IsFootnoteAtEnd();
                bool const bChgEndn = IsEndnAtEnd();
                bool const bChgMyEndn = IsEndnoteAtMyEnd();
                CalcFootnoteAtEndFlag();
                CalcEndAtEndFlag();
                bChgFootnote = ( bChgFootnote != IsFootnoteAtEnd() ) ||
                          ( bChgEndn != IsEndnAtEnd() ) ||
                          ( bChgMyEndn != IsEndnoteAtMyEnd() );
                ChgColumns( aCol, rNewCol, bChgFootnote );
                rInvFlags |= SwSectionFrameInvFlags::SetCompletePaint;
            }
            rInvFlags |= SwSectionFrameInvFlags::InvalidateSize;
            bClear = false;
        }
            break;

        case RES_COL:
            if( !IsInFootnote() )
            {
                assert(pOld && pNew);
                if (pOld && pNew)
                {
                    ChgColumns( *static_cast<const SwFormatCol*>(pOld), *static_cast<const SwFormatCol*>(pNew) );
                    rInvFlags |= SwSectionFrameInvFlags::InvalidateSize | SwSectionFrameInvFlags::SetCompletePaint;
                }
            }
            break;

        case RES_FTN_AT_TXTEND:
            if( !IsInFootnote() )
            {
                bool const bOld = IsFootnoteAtEnd();
                CalcFootnoteAtEndFlag();
                if (bOld != IsFootnoteAtEnd())
                {
                    const SwFormatCol& rNewCol = GetFormat()->GetCol();
                    ChgColumns( rNewCol, rNewCol, true );
                    rInvFlags |= SwSectionFrameInvFlags::InvalidateSize;
                }
            }
            break;

        case RES_END_AT_TXTEND:
            if( !IsInFootnote() )
            {
                bool const bOld = IsEndnAtEnd();
                bool const bMyOld = IsEndnoteAtMyEnd();
                CalcEndAtEndFlag();
                if (bOld != IsEndnAtEnd() || bMyOld != IsEndnoteAtMyEnd())
                {
                    const SwFormatCol& rNewCol = GetFormat()->GetCol();
                    ChgColumns( rNewCol, rNewCol, true );
                    rInvFlags |= SwSectionFrameInvFlags::InvalidateSize;
                }
            }
            break;
        case RES_COLUMNBALANCE:
            rInvFlags |= SwSectionFrameInvFlags::InvalidateSize;
            break;

        case RES_FRAMEDIR :
            SetDerivedR2L( false );
            CheckDirChange();
            break;

        case RES_PROTECT:
#if !ENABLE_WASM_STRIP_ACCESSIBILITY
            {
                SwViewShell *pSh = getRootFrame()->GetCurrShell();
                if( pSh && pSh->GetLayout()->IsAnyShellAccessible() )
                    pSh->Imp()->InvalidateAccessibleEditableState( true, this );
            }
#endif
            break;

        default:
            bClear = false;
    }
    if ( !bClear )
        return;

    if ( pOldSet || pNewSet )
    {
        if ( pOldSet )
            pOldSet->ClearItem( nWhich );
        if ( pNewSet )
            pNewSet->ClearItem( nWhich );
    }
    else
    {
        SwModify aMod;
        SwLayoutFrame::SwClientNotify(aMod, sw::LegacyModifyHint(pOld, pNew));
    }
}

bool SwSectionFrame::ToMaximize( bool bCheckFollow ) const
{
    if( HasFollow() )
    {
        if( !bCheckFollow ) // Don't check superfluous follows
            return true;
        const SwSectionFrame* pFoll = GetFollow();
        while( pFoll && pFoll->IsSuperfluous() )
            pFoll = pFoll->GetFollow();
        if( pFoll )
            return true;
    }
    if( IsFootnoteAtEnd() )
        return false;
    const SwFootnoteContFrame* pCont = ContainsFootnoteCont();
    if( !IsEndnAtEnd() )
        return nullptr != pCont;
    bool bRet = false;
    while( pCont && !bRet )
    {
        if( pCont->FindFootNote() )
            bRet = true;
        else
            pCont = ContainsFootnoteCont( pCont );
    }
    return bRet;
}

SwFootnoteContFrame* SwSectionFrame::ContainsFootnoteCont( const SwFootnoteContFrame* pCont ) const
{
    SwFootnoteContFrame* pRet = nullptr;
    const SwLayoutFrame* pLay;
    if( pCont )
    {
        pLay = pCont->FindFootnoteBossFrame();
        OSL_ENSURE( IsAnLower( pLay ), "ContainsFootnoteCont: Wrong FootnoteContainer" );
        pLay = static_cast<const SwLayoutFrame*>(pLay->GetNext());
    }
    else if( Lower() && Lower()->IsColumnFrame() )
        pLay = static_cast<const SwLayoutFrame*>(Lower());
    else
        pLay = nullptr;
    while ( !pRet && pLay )
    {
        if( pLay->Lower() && pLay->Lower()->GetNext() )
        {
            OSL_ENSURE( pLay->Lower()->GetNext()->IsFootnoteContFrame(),
                    "ToMaximize: Unexpected Frame" );
            pRet = const_cast<SwFootnoteContFrame*>(static_cast<const SwFootnoteContFrame*>(pLay->Lower()->GetNext()));
        }
        OSL_ENSURE( !pLay->GetNext() || pLay->GetNext()->IsLayoutFrame(),
                "ToMaximize: ColFrame expected" );
        pLay = static_cast<const SwLayoutFrame*>(pLay->GetNext());
    }
    return pRet;
}

void SwSectionFrame::InvalidateFootnotePos()
{
    SwFootnoteContFrame* pCont = ContainsFootnoteCont();
    if( pCont )
    {
        SwFrame *pTmp = pCont->ContainsContent();
        if( pTmp )
            pTmp->InvalidatePos_();
    }
}

SwTwips SwSectionFrame::CalcUndersize() const
{
    SwRectFnSet aRectFnSet(this);
    return InnerHeight() - aRectFnSet.GetHeight(getFramePrintArea());
}

SwTwips SwSectionFrame::Undersize()
{
    const auto nRet = CalcUndersize();
    m_bUndersized = (nRet > 0);
    return nRet <= 0 ? 0 : nRet;
}

void SwSectionFrame::CalcFootnoteContent()
{
    vcl::RenderContext* pRenderContext = getRootFrame()->GetCurrShell()->GetOut();
    SwFootnoteContFrame* pCont = ContainsFootnoteCont();
    if( !pCont )
        return;

    SwFrame* pFrame = pCont->ContainsAny();
    if( pFrame )
        pCont->Calc(pRenderContext);
    while( pFrame && IsAnLower( pFrame ) )
    {
        SwFootnoteFrame* pFootnote = pFrame->FindFootnoteFrame();
        if( pFootnote )
            pFootnote->Calc(pRenderContext);
        pFrame->Calc(pRenderContext);
        if( pFrame->IsSctFrame() )
        {
            SwFrame *pTmp = static_cast<SwSectionFrame*>(pFrame)->ContainsAny();
            if( pTmp )
            {
                pFrame = pTmp;
                continue;
            }
        }
        pFrame = pFrame->FindNext();
    }
}

/*
 * If a SectionFrame gets empty, e.g. because its content changes the page/column,
 * it is not destroyed immediately (there could be a pointer left to it on the
 * stack), instead it puts itself in a list at the RootFrame, which is processed
 * later on (in Layaction::Action among others). Its size is set to Null and
 * the pointer to its page as well. Such SectionFrames that are to be deleted
 * must be ignored by the layout/during formatting.
 *
 * With InsertEmptySct the RootFrame stores a SectionFrame in the list,
 * with RemoveFromList it can be removed from the list (Dtor),
 * with DeleteEmptySct the list is processed and the SectionFrames are destroyed.
 */
void SwRootFrame::InsertEmptySct( SwSectionFrame* pDel )
{
    if( !mpDestroy )
        mpDestroy.reset( new SwDestroyList );
    mpDestroy->insert( pDel );
}

void SwRootFrame::DeleteEmptySct_()
{
    assert(mpDestroy);
    while( !mpDestroy->empty() )
    {
        SwSectionFrame* pSect = *mpDestroy->begin();
        mpDestroy->erase( mpDestroy->begin() );
        OSL_ENSURE( !pSect->IsColLocked() && !pSect->IsJoinLocked(),
                "DeleteEmptySct: Locked SectionFrame" );
        SAL_WARN_IF(pSect->IsDeleteForbidden(), "sw.layout", "not allowed delete SwFrame");
        if( !pSect->getFrameArea().HasArea() && !pSect->ContainsContent() && !pSect->IsDeleteForbidden() )
        {
            SwLayoutFrame* pUp = pSect->GetUpper();
            pSect->RemoveFromLayout();
            SwFrame::DestroyFrame(pSect);
            if( pUp && !pUp->Lower() )
            {
                if( pUp->IsPageBodyFrame() )
                    pUp->getRootFrame()->SetSuperfluous();
                else if( pUp->IsFootnoteFrame() && !pUp->IsColLocked() &&
                    pUp->GetUpper() )
                {
                    pUp->Cut();
                    SwFrame::DestroyFrame(pUp);
                }
            }
        }
        else {
            OSL_ENSURE( pSect->GetSection(), "DeleteEmptySct: Half-dead SectionFrame?!" );
        }
    }
}

void SwRootFrame::RemoveFromList_( SwSectionFrame* pSct )
{
    assert(mpDestroy && "Where's my list?");
    mpDestroy->erase( pSct );
}

#ifdef DBG_UTIL
bool SwRootFrame::IsInDelList( SwSectionFrame* pSct ) const
{
    return mpDestroy && mpDestroy->find( pSct ) != mpDestroy->end();
}
#endif

bool SwSectionFrame::IsBalancedSection() const
{
    bool bRet = false;
    if ( GetSection() && Lower() && Lower()->IsColumnFrame() && Lower()->GetNext() )
    {
        bRet = !GetSection()->GetFormat()->GetBalancedColumns().GetValue();
    }
    return bRet;
}

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