path: root/sw/source/core/layout/layact.cxx

/* -*- 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_feature_desktop.h>
#include <config_wasm_strip.h>

#include <ctime>
#include <rootfrm.hxx>
#include <pagefrm.hxx>
#include <viewimp.hxx>
#include <crsrsh.hxx>
#include <dflyobj.hxx>
#include <frmatr.hxx>
#include <frmtool.hxx>
#include <viewopt.hxx>
#include <dbg_lay.hxx>
#include <layouter.hxx>
#include <docstat.hxx>
#include <swevent.hxx>
#include <IDocumentDrawModelAccess.hxx>
#include <IDocumentStatistics.hxx>
#include <IDocumentLayoutAccess.hxx>

#include <sfx2/event.hxx>

#include <ftnidx.hxx>
#include <vcl/svapp.hxx>
#include <editeng/opaqitem.hxx>
#include <SwSmartTagMgr.hxx>
#include <sal/log.hxx>

#include <layact.hxx>
#include <swwait.hxx>
#include <fmtsrnd.hxx>
#include <docsh.hxx>

#include <anchoreddrawobject.hxx>
#include <ndtxt.hxx>
#include <tabfrm.hxx>
#include <ftnfrm.hxx>
#include <txtfrm.hxx>
#include <notxtfrm.hxx>
#include <flyfrms.hxx>
#include <mdiexp.hxx>
#include <sectfrm.hxx>
#include <acmplwrd.hxx>
#include <deletelistener.hxx>
#include <sortedobjs.hxx>
#include <objectformatter.hxx>
#include <fntcache.hxx>
#include <fmtanchr.hxx>
#include <comphelper/scopeguard.hxx>
#include <vector>
#include <tools/diagnose_ex.h>

void SwLayAction::CheckWaitCursor()
{
    if (IsReschedule())
    {
        ::RescheduleProgress(m_pImp->GetShell()->GetDoc()->GetDocShell());
    }
    if ( !m_pWait && IsWaitAllowed() && IsPaint() &&
         ((std::clock() - m_nStartTicks) * 1000 / CLOCKS_PER_SEC >= CLOCKS_PER_SEC/2) )
    {
        m_pWait.reset( new SwWait( *m_pRoot->GetFormat()->GetDoc()->GetDocShell(), true ) );
    }
}

// Time over already?
inline void SwLayAction::CheckIdleEnd()
{
    if (!IsInterrupt())
        m_bInterrupt = bool(GetInputType()) && Application::AnyInput(GetInputType());
}

void SwLayAction::SetStatBar( bool bNew )
{
    if ( bNew )
    {
        m_nEndPage = m_pRoot->GetPageNum();
        m_nEndPage += m_nEndPage * 10 / 100;
    }
    else
        m_nEndPage = USHRT_MAX;
}

bool SwLayAction::PaintWithoutFlys( const SwRect &rRect, const SwContentFrame *pCnt,
                                    const SwPageFrame *pPage )
{
    SwRegionRects aTmp( rRect );
    const SwSortedObjs &rObjs = *pPage->GetSortedObjs();
    const SwFlyFrame *pSelfFly = pCnt->FindFlyFrame();

    for ( size_t i = 0; i < rObjs.size() && !aTmp.empty(); ++i )
    {
        SwVirtFlyDrawObj *pVirtFly = dynamic_cast<SwVirtFlyDrawObj*>(rObjs[i]->DrawObj());
        if ( !pVirtFly )
            continue;

        // do not consider invisible objects
        const IDocumentDrawModelAccess& rIDDMA = pPage->GetFormat()->getIDocumentDrawModelAccess();
        if ( !rIDDMA.IsVisibleLayerId( pVirtFly->GetLayer() ) )
        {
            continue;
        }

        SwFlyFrame *pFly = pVirtFly->GetFlyFrame();

        if ( pFly == pSelfFly || !rRect.Overlaps( pFly->getFrameArea() ) )
            continue;

        if ( pSelfFly && pSelfFly->IsLowerOf( pFly ) )
            continue;

        if ( pFly->GetVirtDrawObj()->GetLayer() == rIDDMA.GetHellId() )
            continue;

        if ( pSelfFly )
        {
            const SdrObject *pTmp = pSelfFly->GetVirtDrawObj();
            if ( pVirtFly->GetLayer() == pTmp->GetLayer() )
            {
                if ( pVirtFly->GetOrdNumDirect() < pTmp->GetOrdNumDirect() )
                    // Only look at things above us, if inside the same layer
                    continue;
            }
            else
            {
                const bool bLowerOfSelf = pFly->IsLowerOf( pSelfFly );
                if ( !bLowerOfSelf && !pFly->GetFormat()->GetOpaque().GetValue() )
                    // Things from other layers are only interesting to us if
                    // they're not transparent or lie inwards
                    continue;
            }
        }

        //     Fly frame without a lower have to be subtracted from paint region.
        //     For checking, if fly frame contains transparent graphic or
        //     has surrounded contour, assure that fly frame has a lower
        if ( pFly->Lower() &&
             pFly->Lower()->IsNoTextFrame() &&
             ( static_cast<SwNoTextFrame*>(pFly->Lower())->IsTransparent() ||
               pFly->GetFormat()->GetSurround().IsContour() )
           )
        {
            continue;
        }

        //     vcl::Region of a fly frame with transparent background or a transparent
        //     shadow have not to be subtracted from paint region
        if ( pFly->IsBackgroundTransparent() )
        {
            continue;
        }

        aTmp -= pFly->getFrameArea();
    }

    bool bRetPaint = false;
    for ( const auto& rRegionRect : aTmp )
        bRetPaint |= m_pImp->GetShell()->AddPaintRect( rRegionRect );
    return bRetPaint;
}

inline bool SwLayAction::PaintContent_( const SwContentFrame *pContent,
                                      const SwPageFrame *pPage,
                                      const SwRect &rRect )
{
    if ( rRect.HasArea() )
    {
        if ( pPage->GetSortedObjs() )
            return PaintWithoutFlys( rRect, pContent, pPage );
        else
            return m_pImp->GetShell()->AddPaintRect( rRect );
    }
    return false;
}

/**
 * Depending of the type, the Content is output according to its changes, or the area
 * to be outputted is registered with the region, respectively.
 */
void SwLayAction::PaintContent( const SwContentFrame *pCnt,
                              const SwPageFrame *pPage,
                              const SwRect &rOldRect,
                              tools::Long nOldBottom )
{
    SwRectFnSet aRectFnSet(pCnt);

    if ( pCnt->IsCompletePaint() || !pCnt->IsTextFrame() )
    {
        SwRect aPaint( pCnt->GetPaintArea() );
        if ( !PaintContent_( pCnt, pPage, aPaint ) )
            pCnt->ResetCompletePaint();
    }
    else
    {
        // paint the area between printing bottom and frame bottom and
        // the area left and right beside the frame, if its height changed.
        tools::Long nOldHeight = aRectFnSet.GetHeight(rOldRect);
        tools::Long nNewHeight = aRectFnSet.GetHeight(pCnt->getFrameArea());
        const bool bHeightDiff = nOldHeight != nNewHeight;
        if( bHeightDiff )
        {
            // consider whole potential paint area.
            SwRect aDrawRect( pCnt->GetPaintArea() );
            if( nOldHeight > nNewHeight )
                nOldBottom = aRectFnSet.GetPrtBottom(*pCnt);
            aRectFnSet.SetTop( aDrawRect, nOldBottom );
            PaintContent_( pCnt, pPage, aDrawRect );
        }
        // paint content area
        SwRect aPaintRect = static_cast<SwTextFrame*>(const_cast<SwContentFrame*>(pCnt))->GetPaintSwRect();
        PaintContent_( pCnt, pPage, aPaintRect );
    }

    if ( !pCnt->IsRetouche() || pCnt->GetNext() )
        return;

    const SwFrame *pTmp = pCnt;
    if( pCnt->IsInSct() )
    {
        const SwSectionFrame* pSct = pCnt->FindSctFrame();
        if( pSct->IsRetouche() && !pSct->GetNext() )
            pTmp = pSct;
    }
    SwRect aRect( pTmp->GetUpper()->GetPaintArea() );
    aRectFnSet.SetTop( aRect, aRectFnSet.GetPrtBottom(*pTmp) );
    if ( !PaintContent_( pCnt, pPage, aRect ) )
        pCnt->ResetRetouche();
}

SwLayAction::SwLayAction( SwRootFrame *pRt, SwViewShellImp *pI ) :
    m_pRoot( pRt ),
    m_pImp( pI ),
    m_pOptTab( nullptr ),
    m_nPreInvaPage( USHRT_MAX ),
    m_nStartTicks( std::clock() ),
    m_nInputType( VclInputFlags::NONE ),
    m_nEndPage( USHRT_MAX ),
    m_nCheckPageNum( USHRT_MAX )
{
    m_bPaintExtraData = ::IsExtraData( m_pImp->GetShell()->GetDoc() );
    m_bPaint = m_bComplete = m_bWaitAllowed = m_bCheckPages = true;
    m_bInterrupt = m_bAgain = m_bNextCycle = m_bCalcLayout = m_bIdle = m_bReschedule =
    m_bUpdateExpFields = m_bBrowseActionStop = m_bActionInProgress = false;
    // init new flag <mbFormatContentOnInterrupt>.
    mbFormatContentOnInterrupt = false;

    assert(!m_pImp->m_pLayAction); // there can be only one SwLayAction
    m_pImp->m_pLayAction = this;   // register there
}

SwLayAction::~SwLayAction()
{
    OSL_ENSURE( !m_pWait, "Wait object not destroyed" );
    m_pImp->m_pLayAction = nullptr;      // unregister
}

void SwLayAction::Reset()
{
    SetAgain(false);
    m_pOptTab = nullptr;
    m_nStartTicks = std::clock();
    m_nInputType = VclInputFlags::NONE;
    m_nEndPage = m_nPreInvaPage = m_nCheckPageNum = USHRT_MAX;
    m_bPaint = m_bComplete = m_bWaitAllowed = m_bCheckPages = true;
    m_bInterrupt = m_bNextCycle = m_bCalcLayout = m_bIdle = m_bReschedule =
    m_bUpdateExpFields = m_bBrowseActionStop = false;
}

bool SwLayAction::RemoveEmptyBrowserPages()
{
    // switching from the normal to the browser mode, empty pages may be
    // retained for an annoyingly long time, so delete them here
    bool bRet = false;
    const SwViewShell *pSh = m_pRoot->GetCurrShell();
    if( pSh && pSh->GetViewOptions()->getBrowseMode() )
    {
        SwPageFrame *pPage = static_cast<SwPageFrame*>(m_pRoot->Lower());
        do
        {
            if ( (pPage->GetSortedObjs() && pPage->GetSortedObjs()->size()) ||
                 pPage->ContainsContent() ||
                 pPage->FindFootnoteCont() )
                pPage = static_cast<SwPageFrame*>(pPage->GetNext());
            else
            {
                bRet = true;
                SwPageFrame *pDel = pPage;
                pPage = static_cast<SwPageFrame*>(pPage->GetNext());
                pDel->Cut();
                SwFrame::DestroyFrame(pDel);
            }
        } while ( pPage );
    }
    return bRet;
}

void SwLayAction::SetAgain(bool bAgain)
{
    if (bAgain == m_bAgain)
        return;

    m_bAgain = bAgain;

    assert(m_aFrameStack.size() == m_aFrameDeleteGuards.size());
    size_t nCount = m_aFrameStack.size();
    if (m_bAgain)
    {
        // LayAction::FormatLayout is now flagged to exit early and will avoid
        // dereferencing any SwFrames in the stack of FormatLayouts so allow
        // their deletion
        for (size_t i = 0; i < nCount; ++i)
            m_aFrameDeleteGuards[i].reset();
    }
    else
    {
        // LayAction::FormatLayout is now continue normally and will
        // dereference the top SwFrame in the stack of m_aFrameStack as each
        // FormatLevel returns so disallow their deletion
        for (size_t i = 0; i < nCount; ++i)
            m_aFrameDeleteGuards[i] = std::make_unique<SwFrameDeleteGuard>(m_aFrameStack[i]);
    }
}

void SwLayAction::PushFormatLayout(SwFrame* pLow)
{
    /* Workaround crash seen in crashtesting with fdo53985-1.docx

       Lock pLow against getting deleted when it will be dereferenced
       after FormatLayout

       If SetAgain is called to make SwLayAction exit early to avoid that
       dereference, then it clears these guards
    */
    m_aFrameStack.push_back(pLow);
    m_aFrameDeleteGuards.push_back(std::make_unique<SwFrameDeleteGuard>(pLow));
}

void SwLayAction::PopFormatLayout()
{
    m_aFrameDeleteGuards.pop_back();
    m_aFrameStack.pop_back();
}

void SwLayAction::Action(OutputDevice* pRenderContext)
{
    m_bActionInProgress = true;

    //TurboMode? Hands-off during idle-format
    if ( IsPaint() && !IsIdle() && TurboAction() )
    {
        m_pWait.reset();
        m_pRoot->ResetTurboFlag();
        m_bActionInProgress = false;
        m_pRoot->DeleteEmptySct();
        return;
    }
    else if ( m_pRoot->GetTurbo() )
    {
        m_pRoot->DisallowTurbo();
        const SwFrame *pFrame = m_pRoot->GetTurbo();
        m_pRoot->ResetTurbo();
        pFrame->InvalidatePage();
    }
    m_pRoot->DisallowTurbo();

    if ( IsCalcLayout() )
        SetCheckPages( false );

    InternalAction(pRenderContext);
    if (RemoveEmptyBrowserPages())
        SetAgain(true);
    while ( IsAgain() )
    {
        SetAgain(false);
        m_bNextCycle = false;
        InternalAction(pRenderContext);
        if (RemoveEmptyBrowserPages())
            SetAgain(true);
    }
    m_pRoot->DeleteEmptySct();

    m_pWait.reset();

    //Turbo-Action permitted again for all cases.
    m_pRoot->ResetTurboFlag();
    m_pRoot->ResetTurbo();

    SetCheckPages( true );

    m_bActionInProgress = false;
}

SwPageFrame* SwLayAction::CheckFirstVisPage( SwPageFrame *pPage )
{
    SwContentFrame *pCnt = pPage->FindFirstBodyContent();
    SwContentFrame *pChk = pCnt;
    bool bPageChgd = false;
    while ( pCnt && pCnt->IsFollow() )
        pCnt = pCnt->FindMaster();
    if ( pCnt && pChk != pCnt )
    {   bPageChgd = true;
        pPage = pCnt->FindPageFrame();
    }

    if ( !pPage->GetFormat()->GetDoc()->GetFootnoteIdxs().empty() )
    {
        SwFootnoteContFrame *pCont = pPage->FindFootnoteCont();
        if ( pCont )
        {
            pCnt = pCont->ContainsContent();
            pChk = pCnt;
            while ( pCnt && pCnt->IsFollow() )
                pCnt = static_cast<SwContentFrame*>(pCnt->FindPrev());
            if ( pCnt && pCnt != pChk )
            {
                if ( bPageChgd )
                {
                    // Use the 'topmost' page
                    SwPageFrame *pTmp = pCnt->FindPageFrame();
                    if ( pPage->GetPhyPageNum() > pTmp->GetPhyPageNum() )
                        pPage = pTmp;
                }
                else
                    pPage = pCnt->FindPageFrame();
            }
        }
    }
    return pPage;
}

// unlock position on start and end of page
// layout process.
static void unlockPositionOfObjects( SwPageFrame *pPageFrame )
{
    assert( pPageFrame );

    SwSortedObjs* pObjs = pPageFrame->GetSortedObjs();
    if ( pObjs )
    {
        for (SwAnchoredObject* pObj : *pObjs)
        {
            pObj->UnlockPosition();
        }
    }
}

void SwLayAction::InternalAction(OutputDevice* pRenderContext)
{
    OSL_ENSURE( m_pRoot->Lower()->IsPageFrame(), ":-( No page below the root.");

    m_pRoot->Calc(pRenderContext);

    // Figure out the first invalid page or the first one to be formatted,
    // respectively. A complete-action means the first invalid page.
    // However, the first page to be formatted might be the one having the
    // number 1.  If we're doing a fake formatting, the number of the first
    // page is the number of the first visible page.
    SwPageFrame *pPage = IsComplete() ? static_cast<SwPageFrame*>(m_pRoot->Lower()) :
                m_pImp->GetFirstVisPage(pRenderContext);
    if ( !pPage )
        pPage = static_cast<SwPageFrame*>(m_pRoot->Lower());

    // If there's a first-flow-Content in the first visible page that's also a Follow,
    // we switch the page back to the original master of that Content.
    if ( !IsComplete() )
        pPage = CheckFirstVisPage( pPage );
    sal_uInt16 nFirstPageNum = pPage->GetPhyPageNum();

    while ( pPage && !pPage->IsInvalid() && !pPage->IsInvalidFly() )
        pPage = static_cast<SwPageFrame*>(pPage->GetNext());

    IDocumentLayoutAccess& rLayoutAccess = m_pRoot->GetFormat()->getIDocumentLayoutAccess();
    const bool bNoLoop = pPage && SwLayouter::StartLoopControl(m_pRoot->GetFormat()->GetDoc(), pPage);
    sal_uInt16 nPercentPageNum = 0;

    auto lcl_isLayoutLooping = [&]()
    {
        const bool bAgain = this->IsAgain();
        if (bAgain && bNoLoop)
            rLayoutAccess.GetLayouter()->EndLoopControl();
        return bAgain;
    };

    while ( (pPage && !IsInterrupt()) || m_nCheckPageNum != USHRT_MAX )
    {
        // note: this is the only place that consumes and resets m_nCheckPageNum
        if ((IsInterrupt() || !pPage) && m_nCheckPageNum != USHRT_MAX)
        {
            if (!pPage || m_nCheckPageNum < pPage->GetPhyPageNum())
            {
                SwPageFrame *pPg = static_cast<SwPageFrame*>(m_pRoot->Lower());
                while (pPg && pPg->GetPhyPageNum() < m_nCheckPageNum)
                    pPg = static_cast<SwPageFrame*>(pPg->GetNext());
                if (pPg)
                    pPage = pPg;
                if (!pPage)
                    break;
            }

            SwPageFrame *pTmp = pPage->GetPrev() ?
                                        static_cast<SwPageFrame*>(pPage->GetPrev()) : pPage;
            SetCheckPages( true );
            SwFrame::CheckPageDescs( pPage, true, &pTmp );
            SetCheckPages( false );
            m_nCheckPageNum = USHRT_MAX;
            pPage = pTmp;
            continue;
        }

        if ( m_nEndPage != USHRT_MAX && pPage->GetPhyPageNum() > nPercentPageNum )
        {
            nPercentPageNum = pPage->GetPhyPageNum();
            ::SetProgressState( nPercentPageNum, m_pImp->GetShell()->GetDoc()->GetDocShell());
        }
        m_pOptTab = nullptr;

        // No Shortcut for Idle or CalcLayout
        const bool bTakeShortcut = !IsIdle() && !IsComplete() && IsShortCut(pPage);

        m_pRoot->DeleteEmptySct();
        if (lcl_isLayoutLooping()) return;

        if (!bTakeShortcut)
        {
            while ( !IsInterrupt() && !IsNextCycle() &&
                    ((pPage->GetSortedObjs() && pPage->IsInvalidFly()) || pPage->IsInvalid()) )
            {
                unlockPositionOfObjects( pPage );

                SwObjectFormatter::FormatObjsAtFrame( *pPage, *pPage, this );
                if ( !pPage->GetSortedObjs() )
                {
                    // If there are no (more) Flys, the flags are superfluous.
                    pPage->ValidateFlyLayout();
                    pPage->ValidateFlyContent();
                }
                // change condition
                while ( !IsInterrupt() && !IsNextCycle() &&
                        ( pPage->IsInvalid() ||
                          (pPage->GetSortedObjs() && pPage->IsInvalidFly()) ) )
                {
                    PROTOCOL( pPage, PROT::FileInit, DbgAction::NONE, nullptr)
                    if (lcl_isLayoutLooping()) return;

                    // new loop control
                    int nLoopControlRuns_1 = 0;
                    const int nLoopControlMax = 20;

                    while ( !IsNextCycle() && pPage->IsInvalidLayout() )
                    {
                        pPage->ValidateLayout();

                        if ( ++nLoopControlRuns_1 > nLoopControlMax )
                        {
                            OSL_FAIL( "LoopControl_1 in SwLayAction::InternalAction" );
                            break;
                        }

                        FormatLayout( pRenderContext, pPage );
                        if (lcl_isLayoutLooping()) return;
                    }
                    // change condition
                    if ( !IsNextCycle() &&
                         ( pPage->IsInvalidContent() ||
                           (pPage->GetSortedObjs() && pPage->IsInvalidFly()) ) )
                    {
                        pPage->ValidateFlyInCnt();
                        pPage->ValidateContent();
                        pPage->ValidateFlyLayout();
                        pPage->ValidateFlyContent();
                        if ( !FormatContent( pPage ) )
                        {
                            if (lcl_isLayoutLooping()) return;
                            pPage->InvalidateContent();
                            pPage->InvalidateFlyInCnt();
                            pPage->InvalidateFlyLayout();
                            pPage->InvalidateFlyContent();
                            if ( IsBrowseActionStop() )
                                m_bInterrupt = true;
                        }
                    }
                    if( bNoLoop )
                        rLayoutAccess.GetLayouter()->LoopControl( pPage );
                }

                unlockPositionOfObjects( pPage );
            }

            // A previous page may be invalid again.
            if (lcl_isLayoutLooping()) return;
            if ( !pPage->GetSortedObjs() )
            {
                // If there are no (more) Flys, the flags are superfluous.
                pPage->ValidateFlyLayout();
                pPage->ValidateFlyContent();
            }
            if ( !IsInterrupt() )
            {
                SetNextCycle( false );

                if ( m_nPreInvaPage != USHRT_MAX )
                {
                    if( !IsComplete() && m_nPreInvaPage + 2 < nFirstPageNum )
                    {
                        m_pImp->SetFirstVisPageInvalid();
                        SwPageFrame *pTmpPage = m_pImp->GetFirstVisPage(pRenderContext);
                        nFirstPageNum = pTmpPage->GetPhyPageNum();
                        if( m_nPreInvaPage < nFirstPageNum )
                        {
                            m_nPreInvaPage = nFirstPageNum;
                            pPage = pTmpPage;
                        }
                    }
                    while ( pPage->GetPrev() && pPage->GetPhyPageNum() > m_nPreInvaPage )
                        pPage = static_cast<SwPageFrame*>(pPage->GetPrev());
                    m_nPreInvaPage = USHRT_MAX;
                }

                while ( pPage->GetPrev() &&
                        ( static_cast<SwPageFrame*>(pPage->GetPrev())->IsInvalid() ||
                          ( static_cast<SwPageFrame*>(pPage->GetPrev())->GetSortedObjs() &&
                            static_cast<SwPageFrame*>(pPage->GetPrev())->IsInvalidFly())) &&
                        (static_cast<SwPageFrame*>(pPage->GetPrev())->GetPhyPageNum() >=
                            nFirstPageNum) )
                {
                    pPage = static_cast<SwPageFrame*>(pPage->GetPrev());
                }

                // Continue to the next invalid page
                while ( pPage && !pPage->IsInvalid() &&
                        (!pPage->GetSortedObjs() || !pPage->IsInvalidFly()) )
                {
                    pPage = static_cast<SwPageFrame*>(pPage->GetNext());
                }
                if( bNoLoop )
                    rLayoutAccess.GetLayouter()->LoopControl( pPage );
            }
            CheckIdleEnd();
        }

        if ((bTakeShortcut || !pPage) && !IsInterrupt() &&
             (m_pRoot->IsSuperfluous() || m_pRoot->IsAssertFlyPages()) )
        {
            // tdf#139426 allow suppression of AssertFlyPages
            if ( m_pRoot->IsAssertFlyPages() && !m_pRoot->IsTableUpdateInProgress())
            {
                m_pRoot->AssertFlyPages();
            }
            if ( m_pRoot->IsSuperfluous() )
            {
                bool bOld = IsAgain();
                m_pRoot->RemoveSuperfluous();
                SetAgain(bOld);
            }
            if (lcl_isLayoutLooping()) return;
            pPage = static_cast<SwPageFrame*>(m_pRoot->Lower());
            while ( pPage && !pPage->IsInvalid() && !pPage->IsInvalidFly() )
                pPage = static_cast<SwPageFrame*>(pPage->GetNext());
            while ( pPage && pPage->GetNext() &&
                    pPage->GetPhyPageNum() < nFirstPageNum )
                pPage = static_cast<SwPageFrame*>(pPage->GetNext());
        }
        else if (bTakeShortcut)
            break;
    }
    if ( IsInterrupt() && pPage )
    {
        // If we have input, we don't want to format content anymore, but
        // we still should clean the layout.
        // Otherwise, the following situation might arise:
        // The user enters some text at the end of the paragraph of the last
        // page, causing the paragraph to create a Follow for the next page.
        // Meanwhile the user continues typing, so we have input while
        // still formatting.
        // The paragraph on the new page has already been partially formatted,
        // and the new page has been fully formatted and is set to CompletePaint,
        // but hasn't added itself to the area to be output. Then we paint,
        // the CompletePaint of the page is reset because the new paragraph
        // already added itself, but the borders of the page haven't been painted
        // yet.
        // Oh well, with the inevitable following LayAction, the page doesn't
        // register itself, because it's (LayoutFrame) flags have been reset
        // already - the border of the page will never be painted.
        SwPageFrame *pPg = pPage;
        if (lcl_isLayoutLooping()) return;
        const SwRect &rVis = m_pImp->GetShell()->VisArea();

        while( pPg && pPg->getFrameArea().Bottom() < rVis.Top() )
            pPg = static_cast<SwPageFrame*>(pPg->GetNext());
        if( pPg != pPage )
            pPg = pPg ? static_cast<SwPageFrame*>(pPg->GetPrev()) : pPage;

        // set flag for interrupt content formatting
        mbFormatContentOnInterrupt = true;
        tools::Long nBottom = rVis.Bottom();
        // #i42586# - format current page, if idle action is active
        // This is an optimization for the case that the interrupt is created by
        // the move of a form control object, which is represented by a window.
        while ( pPg && ( pPg->getFrameArea().Top() < nBottom ||
                         ( IsIdle() && pPg == pPage ) ) )
        {
            unlockPositionOfObjects( pPg );

            if (lcl_isLayoutLooping()) return;

            // new loop control
            int nLoopControlRuns_2 = 0;
            const int nLoopControlMax = 20;

            // special case: interrupt content formatting
            // conditions are incorrect and are too strict.
            // adjust interrupt formatting to normal page formatting - see above.
            while ( ( mbFormatContentOnInterrupt &&
                      ( pPg->IsInvalid() ||
                        ( pPg->GetSortedObjs() && pPg->IsInvalidFly() ) ) ) ||
                    ( !mbFormatContentOnInterrupt && pPg->IsInvalidLayout() ) )
            {
                if (lcl_isLayoutLooping()) return;
                // format also at-page anchored objects
                SwObjectFormatter::FormatObjsAtFrame( *pPg, *pPg, this );
                if ( !pPg->GetSortedObjs() )
                {
                    pPg->ValidateFlyLayout();
                    pPg->ValidateFlyContent();
                }

                // new loop control
                int nLoopControlRuns_3 = 0;

                while ( pPg->IsInvalidLayout() )
                {
                    pPg->ValidateLayout();

                    if ( ++nLoopControlRuns_3 > nLoopControlMax )
                    {
                        OSL_FAIL( "LoopControl_3 in Interrupt formatting in SwLayAction::InternalAction" );
                        break;
                    }

                    FormatLayout( pRenderContext, pPg );
                    if (lcl_isLayoutLooping()) return;
                }

                if ( mbFormatContentOnInterrupt &&
                     ( pPg->IsInvalidContent() ||
                       ( pPg->GetSortedObjs() && pPg->IsInvalidFly() ) ) )
                {
                    pPg->ValidateFlyInCnt();
                    pPg->ValidateContent();
                    pPg->ValidateFlyLayout();
                    pPg->ValidateFlyContent();

                    if ( ++nLoopControlRuns_2 > nLoopControlMax )
                    {
                        OSL_FAIL( "LoopControl_2 in Interrupt formatting in SwLayAction::InternalAction" );
                        break;
                    }

                    if ( !FormatContent( pPg ) )
                    {
                        if (lcl_isLayoutLooping()) return;
                        pPg->InvalidateContent();
                        pPg->InvalidateFlyInCnt();
                        pPg->InvalidateFlyLayout();
                        pPg->InvalidateFlyContent();
                    }
                    // we are satisfied if the content is formatted once complete.
                    else
                    {
                        break;
                    }
                }
            }

            unlockPositionOfObjects( pPg );
            pPg = static_cast<SwPageFrame*>(pPg->GetNext());
        }
        // reset flag for special interrupt content formatting.
        mbFormatContentOnInterrupt = false;
    }
    m_pOptTab = nullptr;
    if( bNoLoop )
        rLayoutAccess.GetLayouter()->EndLoopControl();
}

bool SwLayAction::TurboAction_( const SwContentFrame *pCnt )
{

    const SwPageFrame *pPage = nullptr;
    if ( !pCnt->isFrameAreaDefinitionValid() || pCnt->IsCompletePaint() || pCnt->IsRetouche() )
    {
        const SwRect aOldRect( pCnt->UnionFrame( true ) );
        const tools::Long   nOldBottom = pCnt->getFrameArea().Top() + pCnt->getFramePrintArea().Bottom();
        pCnt->Calc(m_pImp->GetShell()->GetOut());
        if ( pCnt->getFrameArea().Bottom() < aOldRect.Bottom() )
            pCnt->SetRetouche();

        pPage = pCnt->FindPageFrame();
        PaintContent( pCnt, pPage, aOldRect, nOldBottom );

        if ( !pCnt->GetValidLineNumFlag() && pCnt->IsTextFrame() )
        {
            const sal_uLong nAllLines = static_cast<const SwTextFrame*>(pCnt)->GetAllLines();
            const_cast<SwTextFrame*>(static_cast<const SwTextFrame*>(pCnt))->RecalcAllLines();
            if ( nAllLines != static_cast<const SwTextFrame*>(pCnt)->GetAllLines() )
            {
                if ( IsPaintExtraData() )
                    m_pImp->GetShell()->AddPaintRect( pCnt->getFrameArea() );
                // This is to calculate the remaining LineNums on the page,
                // and we don't stop processing here. To perform this inside RecalcAllLines
                // would be expensive, because we would have to notify the page even
                // in unnecessary cases (normal actions).
                const SwContentFrame *pNxt = pCnt->GetNextContentFrame();
                while ( pNxt &&
                        (pNxt->IsInTab() || pNxt->IsInDocBody() != pCnt->IsInDocBody()) )
                    pNxt = pNxt->GetNextContentFrame();
                if ( pNxt )
                    pNxt->InvalidatePage();
            }
            return false;
        }

        if ( pPage->IsInvalidLayout() || (pPage->GetSortedObjs() && pPage->IsInvalidFly()) )
            return false;
    }
    if ( !pPage )
        pPage = pCnt->FindPageFrame();

    // format floating screen objects at content frame.
    if ( pCnt->IsTextFrame() &&
         !SwObjectFormatter::FormatObjsAtFrame( *const_cast<SwContentFrame*>(pCnt),
                                              *pPage, this ) )
    {
        return false;
    }

    if ( pPage->IsInvalidContent() )
        return false;
    return true;
}

bool SwLayAction::TurboAction()
{
    bool bRet = true;

    if ( m_pRoot->GetTurbo() )
    {
        if ( !TurboAction_( m_pRoot->GetTurbo() ) )
        {
            CheckIdleEnd();
            bRet = false;
        }
        m_pRoot->ResetTurbo();
    }
    else
        bRet = false;
    return bRet;
}

static bool lcl_IsInvaLay( const SwFrame *pFrame, tools::Long nBottom )
{
    return !pFrame->isFrameAreaDefinitionValid() ||
         (pFrame->IsCompletePaint() && ( pFrame->getFrameArea().Top() < nBottom ) );
}

static const SwFrame *lcl_FindFirstInvaLay( const SwFrame *pFrame, tools::Long nBottom )
{
    OSL_ENSURE( pFrame->IsLayoutFrame(), "FindFirstInvaLay, no LayFrame" );

    if (lcl_IsInvaLay(pFrame, nBottom))
        return pFrame;
    pFrame = static_cast<const SwLayoutFrame*>(pFrame)->Lower();
    while ( pFrame )
    {
        if ( pFrame->IsLayoutFrame() )
        {
            if (lcl_IsInvaLay(pFrame, nBottom))
                return pFrame;
            const SwFrame *pTmp = lcl_FindFirstInvaLay( pFrame, nBottom );
            if ( nullptr != pTmp )
                return pTmp;
        }
        pFrame = pFrame->GetNext();
    }
    return nullptr;
}

static const SwFrame *lcl_FindFirstInvaContent( const SwLayoutFrame *pLay, tools::Long nBottom,
                                     const SwContentFrame *pFirst )
{
    const SwContentFrame *pCnt = pFirst ? pFirst->GetNextContentFrame() :
                                      pLay->ContainsContent();
    while ( pCnt )
    {
        if ( !pCnt->isFrameAreaDefinitionValid() || pCnt->IsCompletePaint() )
        {
            if ( pCnt->getFrameArea().Top() <= nBottom )
                return pCnt;
        }

        if ( pCnt->GetDrawObjs() )
        {
            const SwSortedObjs &rObjs = *pCnt->GetDrawObjs();
            for (SwAnchoredObject* pObj : rObjs)
            {
                if ( auto pFly = pObj->DynCastFlyFrame() )
                {
                    if ( pFly->IsFlyInContentFrame() )
                    {
                        if ( static_cast<const SwFlyInContentFrame*>(pFly)->IsInvalid() ||
                             pFly->IsCompletePaint() )
                        {
                            if ( pFly->getFrameArea().Top() <= nBottom )
                                return pFly;
                        }
                        const SwFrame *pFrame = lcl_FindFirstInvaContent( pFly, nBottom, nullptr );
                        if ( pFrame && pFrame->getFrameArea().Bottom() <= nBottom )
                            return pFrame;
                    }
                }
            }
        }
        if ( pCnt->getFrameArea().Top() > nBottom && !pCnt->IsInTab() )
            return nullptr;
        pCnt = pCnt->GetNextContentFrame();
        if ( !pLay->IsAnLower( pCnt ) )
            break;
    }
    return nullptr;
}

// consider drawing objects
static const SwAnchoredObject* lcl_FindFirstInvaObj( const SwPageFrame* _pPage,
                                              tools::Long _nBottom )
{
    OSL_ENSURE( _pPage->GetSortedObjs(), "FindFirstInvaObj, no Objs" );

    for (SwAnchoredObject* pObj : *_pPage->GetSortedObjs())
    {
        if ( auto pFly = pObj->DynCastFlyFrame()  )
        {
            if ( pFly->getFrameArea().Top() <= _nBottom )
            {
                if ( pFly->IsInvalid() || pFly->IsCompletePaint() )
                    return pFly;

                const SwFrame* pTmp;
                if ( nullptr != (pTmp = lcl_FindFirstInvaContent( pFly, _nBottom, nullptr )) &&
                     pTmp->getFrameArea().Top() <= _nBottom )
                    return pFly;
            }
        }
        else if ( auto pDrawObject = dynamic_cast< const SwAnchoredDrawObject *>( pObj ) )
        {
            if ( !pDrawObject->IsValidPos() )
            {
                return pObj;
            }
        }
    }
    return nullptr;
}

/* Returns True if the page lies directly below or right of the visible area.
 *
 * It's possible for things to change in such a way that the processing
 * (of the caller!) has to continue with the predecessor of the passed page.
 * The parameter might therefore get modified!
 * For BrowseMode, you may even activate the ShortCut if the invalid content
 * of the page lies below the visible area.
 */
bool SwLayAction::IsShortCut( SwPageFrame *&prPage )
{
    vcl::RenderContext* pRenderContext = m_pImp->GetShell()->GetOut();
    bool bRet = false;
    const SwViewShell *pSh = m_pRoot->GetCurrShell();
    const bool bBrowse = pSh && pSh->GetViewOptions()->getBrowseMode();

    // If the page is not valid, we quickly format it, otherwise
    // there's gonna be no end of trouble
    if ( !prPage->isFrameAreaDefinitionValid() )
    {
        if ( bBrowse )
        {
            // format complete page
            // Thus, loop on all lowers of the page <prPage>, instead of only
            // format its first lower.
            // NOTE: In online layout (bBrowse == true) a page can contain
            //     a header frame and/or a footer frame beside the body frame.
            prPage->Calc(pRenderContext);
            SwFrame* pPageLowerFrame = prPage->Lower();
            while ( pPageLowerFrame )
            {
                pPageLowerFrame->Calc(pRenderContext);
                pPageLowerFrame = pPageLowerFrame->GetNext();
            }
        }
        else
            FormatLayout( pSh ? pSh->GetOut() : nullptr, prPage );
        if ( IsAgain() )
            return false;
    }

    const SwRect &rVis = m_pImp->GetShell()->VisArea();
    if ( (prPage->getFrameArea().Top() >= rVis.Bottom()) ||
         (prPage->getFrameArea().Left()>= rVis.Right()) )
    {
        bRet = true;

        // This is going to be a bit nasty: The first ContentFrame of this
        // page in the Body text needs formatting; if it changes the page during
        // that process, I need to start over a page further back, because we
        // have been processing a PageBreak.
        // Even more uncomfortable: The next ContentFrame must be formatted,
        // because it's possible for empty pages to exist temporarily (for example
        // a paragraph across multiple pages gets deleted or reduced in size).

        // This is irrelevant for the browser, if the last Cnt above it
        // isn't visible anymore.

        const SwPageFrame *p2ndPage = prPage;
        const SwContentFrame *pContent;
        const SwLayoutFrame* pBody = p2ndPage->FindBodyCont();
        if( p2ndPage->IsFootnotePage() && pBody )
            pBody = static_cast<const SwLayoutFrame*>(pBody->GetNext());
        pContent = pBody ? pBody->ContainsContent() : nullptr;
        while ( p2ndPage && !pContent )
        {
            p2ndPage = static_cast<const SwPageFrame*>(p2ndPage->GetNext());
            if( p2ndPage )
            {
                pBody = p2ndPage->FindBodyCont();
                if( p2ndPage->IsFootnotePage() && pBody )
                    pBody = static_cast<const SwLayoutFrame*>(pBody->GetNext());
                pContent = pBody ? pBody->ContainsContent() : nullptr;
            }
        }
        if ( pContent )
        {
            bool bTstCnt = true;
            if ( bBrowse )
            {
                // Is the Cnt before already invisible?
                const SwFrame *pLst = pContent;
                if ( pLst->IsInTab() )
                    pLst = pContent->FindTabFrame();
                if ( pLst->IsInSct() )
                    pLst = pContent->FindSctFrame();
                pLst = pLst->FindPrev();
                if ( pLst &&
                     (pLst->getFrameArea().Top() >= rVis.Bottom() ||
                      pLst->getFrameArea().Left()>= rVis.Right()) )
                {
                    bTstCnt = false;
                }
            }

            if ( bTstCnt )
            {
                // check after each frame calculation,
                // if the content frame has changed the page. If yes, no other
                // frame calculation is performed
                bool bPageChg = false;

                if ( pContent->IsInSct() )
                {
                    const SwSectionFrame *pSct = const_cast<SwFrame*>(static_cast<SwFrame const *>(pContent))->ImplFindSctFrame();
                    if ( !pSct->isFrameAreaDefinitionValid() )
                    {
                        pSct->Calc(pRenderContext);
                        pSct->SetCompletePaint();
                        if ( IsAgain() )
                            return false;

                        bPageChg = pContent->FindPageFrame() != p2ndPage &&
                                   prPage->GetPrev();
                    }
                }

                if ( !bPageChg && !pContent->isFrameAreaDefinitionValid() )
                {
                    pContent->Calc(pRenderContext);
                    pContent->SetCompletePaint();
                    if ( IsAgain() )
                        return false;

                    bPageChg = pContent->FindPageFrame() != p2ndPage &&
                               prPage->GetPrev();
                }

                if ( !bPageChg && pContent->IsInTab() )
                {
                    const SwTabFrame *pTab = const_cast<SwFrame*>(static_cast<SwFrame const *>(pContent))->ImplFindTabFrame();
                    if ( !pTab->isFrameAreaDefinitionValid() )
                    {
                        pTab->Calc(pRenderContext);
                        pTab->SetCompletePaint();
                        if ( IsAgain() )
                            return false;

                        bPageChg = pContent->FindPageFrame() != p2ndPage &&
                                   prPage->GetPrev();
                    }
                }

                if ( !bPageChg && pContent->IsInSct() )
                {
                    const SwSectionFrame *pSct = const_cast<SwFrame*>(static_cast<SwFrame const *>(pContent))->ImplFindSctFrame();
                    if ( !pSct->isFrameAreaDefinitionValid() )
                    {
                        pSct->Calc(pRenderContext);
                        pSct->SetCompletePaint();
                        if ( IsAgain() )
                            return false;

                        bPageChg = pContent->FindPageFrame() != p2ndPage &&
                                   prPage->GetPrev();
                    }
                }

                if ( bPageChg )
                {
                    bRet = false;
                    const SwPageFrame* pTmp = pContent->FindPageFrame();
                    if ( pTmp->GetPhyPageNum() < prPage->GetPhyPageNum() &&
                         pTmp->IsInvalid() )
                    {
                        prPage = const_cast<SwPageFrame*>(pTmp);
                    }
                    else
                    {
                        prPage = static_cast<SwPageFrame*>(prPage->GetPrev());
                    }
                }
                // no shortcut, if at previous page
                // an anchored object is registered, whose anchor is <pContent>.
                else if ( prPage->GetPrev() )
                {
                    SwSortedObjs* pObjs =
                        static_cast<SwPageFrame*>(prPage->GetPrev())->GetSortedObjs();
                    if ( pObjs )
                    {
                        for (SwAnchoredObject* pObj : *pObjs)
                        {
                            if ( pObj->GetAnchorFrameContainingAnchPos() == pContent )
                            {
                                bRet = false;
                                break;
                            }
                        }
                    }
                }
            }
        }
    }

    if ( !bRet && bBrowse )
    {
        const tools::Long nBottom = rVis.Bottom();
        const SwAnchoredObject* pObj( nullptr );
        if ( prPage->GetSortedObjs() &&
             (prPage->IsInvalidFlyLayout() || prPage->IsInvalidFlyContent()) &&
             nullptr != (pObj = lcl_FindFirstInvaObj( prPage, nBottom )) &&
             pObj->GetObjRect().Top() <= nBottom )
        {
            return false;
        }
        const SwFrame* pFrame( nullptr );
        if ( prPage->IsInvalidLayout() &&
             nullptr != (pFrame = lcl_FindFirstInvaLay( prPage, nBottom )) &&
             pFrame->getFrameArea().Top() <= nBottom )
        {
            return false;
        }
        if ( (prPage->IsInvalidContent() || prPage->IsInvalidFlyInCnt()) &&
             nullptr != (pFrame = lcl_FindFirstInvaContent( prPage, nBottom, nullptr )) &&
             pFrame->getFrameArea().Top() <= nBottom )
        {
            return false;
        }
        bRet = true;
    }
    return bRet;
}

// introduce support for vertical layout
bool SwLayAction::FormatLayout( OutputDevice *pRenderContext, SwLayoutFrame *pLay, bool bAddRect )
{
    OSL_ENSURE( !IsAgain(), "Attention to the invalid page." );
    if ( IsAgain() )
        return false;

    bool bChanged = false;
    bool bAlreadyPainted = false;
    // remember frame at complete paint
    SwRect aFrameAtCompletePaint;

    if ( !pLay->isFrameAreaDefinitionValid() || pLay->IsCompletePaint() )
    {
        if ( pLay->GetPrev() && !pLay->GetPrev()->isFrameAreaDefinitionValid() )
            pLay->GetPrev()->SetCompletePaint();

        SwRect aOldFrame( pLay->getFrameArea() );
        SwRect aOldRect( aOldFrame );
        if( pLay->IsPageFrame() )
        {
            aOldRect = static_cast<SwPageFrame*>(pLay)->GetBoundRect(pRenderContext);
        }

        {
            SwFrameDeleteGuard aDeleteGuard(pLay);
            pLay->Calc(pRenderContext);
        }

        if ( aOldFrame != pLay->getFrameArea() )
            bChanged = true;

        bool bNoPaint = false;
        if ( pLay->IsPageBodyFrame() &&
             pLay->getFrameArea().Pos() == aOldRect.Pos() &&
             pLay->Lower() )
        {
            const SwViewShell *pSh = pLay->getRootFrame()->GetCurrShell();
            // Limitations because of headers / footers
            if( pSh && pSh->GetViewOptions()->getBrowseMode() &&
                !( pLay->IsCompletePaint() && pLay->FindPageFrame()->FindFootnoteCont() ) )
                bNoPaint = true;
        }

        if ( !bNoPaint && IsPaint() && bAddRect && (pLay->IsCompletePaint() || bChanged) )
        {
            SwRect aPaint( pLay->getFrameArea() );
            // consider border and shadow for
            // page frames -> enlarge paint rectangle correspondingly.
            if ( pLay->IsPageFrame() )
            {
                SwPageFrame* pPageFrame = static_cast<SwPageFrame*>(pLay);
                aPaint = pPageFrame->GetBoundRect(pRenderContext);
            }

            bool bPageInBrowseMode = pLay->IsPageFrame();
            if( bPageInBrowseMode )
            {
                const SwViewShell *pSh = pLay->getRootFrame()->GetCurrShell();
                if( !pSh || !pSh->GetViewOptions()->getBrowseMode() )
                    bPageInBrowseMode = false;
            }
            if( bPageInBrowseMode )
            {
                // NOTE: no vertical layout in online layout
                // Is the change even visible?
                if ( pLay->IsCompletePaint() )
                {
                    m_pImp->GetShell()->AddPaintRect( aPaint );
                    bAddRect = false;
                }
                else
                {
                    SwRegionRects aRegion( aOldRect );
                    aRegion -= aPaint;
                    for ( size_t i = 0; i < aRegion.size(); ++i )
                        m_pImp->GetShell()->AddPaintRect( aRegion[i] );
                    aRegion.ChangeOrigin( aPaint );
                    aRegion.clear();
                    aRegion.push_back( aPaint );
                    aRegion -= aOldRect;
                    for ( size_t i = 0; i < aRegion.size(); ++i )
                        m_pImp->GetShell()->AddPaintRect( aRegion[i] );
                }
            }
            else
            {
                m_pImp->GetShell()->AddPaintRect( aPaint );
                bAlreadyPainted = true;
                // remember frame at complete paint
                aFrameAtCompletePaint = pLay->getFrameArea();
            }

            // provide paint of spacing
            // between pages (not only for in online mode).
            if ( pLay->IsPageFrame() )
            {
                const SwViewShell *pSh = pLay->getRootFrame()->GetCurrShell();
                const SwTwips nHalfDocBorder = pSh ? pSh->GetViewOptions()->GetGapBetweenPages()
                                                   : SwViewOption::defGapBetweenPages;
                const bool bLeftToRightViewLayout = m_pRoot->IsLeftToRightViewLayout();
                const bool bPrev = bLeftToRightViewLayout ? pLay->GetPrev() : pLay->GetNext();
                const bool bNext = bLeftToRightViewLayout ? pLay->GetNext() : pLay->GetPrev();
                SwPageFrame* pPageFrame = static_cast<SwPageFrame*>(pLay);
                SwRect aPageRect( pLay->getFrameArea() );

                if(pSh)
                {
                    SwPageFrame::GetBorderAndShadowBoundRect(aPageRect, pSh,
                        pRenderContext,
                        aPageRect, pPageFrame->IsLeftShadowNeeded(), pPageFrame->IsRightShadowNeeded(),
                        pPageFrame->SidebarPosition() == sw::sidebarwindows::SidebarPosition::RIGHT);
                }

                if ( bPrev )
                {
                    // top
                    SwRect aSpaceToPrevPage( aPageRect );
                    aSpaceToPrevPage.Top( aSpaceToPrevPage.Top() - nHalfDocBorder );
                    aSpaceToPrevPage.Bottom( pLay->getFrameArea().Top() );
                    if(!aSpaceToPrevPage.IsEmpty())
                        m_pImp->GetShell()->AddPaintRect( aSpaceToPrevPage );

                    // left
                    aSpaceToPrevPage = aPageRect;
                    aSpaceToPrevPage.Left( aSpaceToPrevPage.Left() - nHalfDocBorder );
                    aSpaceToPrevPage.Right( pLay->getFrameArea().Left() );
                    if(!aSpaceToPrevPage.IsEmpty())
                        m_pImp->GetShell()->AddPaintRect( aSpaceToPrevPage );
                }
                if ( bNext )
                {
                    // bottom
                    SwRect aSpaceToNextPage( aPageRect );
                    aSpaceToNextPage.Bottom( aSpaceToNextPage.Bottom() + nHalfDocBorder );
                    aSpaceToNextPage.Top( pLay->getFrameArea().Bottom() );
                    if(!aSpaceToNextPage.IsEmpty())
                        m_pImp->GetShell()->AddPaintRect( aSpaceToNextPage );

                    // right
                    aSpaceToNextPage = aPageRect;
                    aSpaceToNextPage.Right( aSpaceToNextPage.Right() + nHalfDocBorder );
                    aSpaceToNextPage.Left( pLay->getFrameArea().Right() );
                    if(!aSpaceToNextPage.IsEmpty())
                        m_pImp->GetShell()->AddPaintRect( aSpaceToNextPage );
                }
            }
        }
        pLay->ResetCompletePaint();
    }

    if ( IsPaint() && bAddRect &&
         !pLay->GetNext() && pLay->IsRetoucheFrame() && pLay->IsRetouche() )
    {
        // vertical layout support
        SwRectFnSet aRectFnSet(pLay);
        SwRect aRect( pLay->GetUpper()->GetPaintArea() );
        aRectFnSet.SetTop( aRect, aRectFnSet.GetPrtBottom(*pLay) );
        if ( !m_pImp->GetShell()->AddPaintRect( aRect ) )
            pLay->ResetRetouche();
    }

    if( bAlreadyPainted )
        bAddRect = false;

    CheckWaitCursor();

    if ( IsAgain() )
        return false;

    // Now, deal with the lowers that are LayoutFrames

    if ( pLay->IsFootnoteFrame() ) // no LayFrames as Lower
        return bChanged;

    SwFrame *pLow = pLay->Lower();
    bool bTabChanged = false;
    while ( pLow && pLow->GetUpper() == pLay )
    {
        SwFrame* pNext = nullptr;
        if ( pLow->IsLayoutFrame() )
        {
            if ( pLow->IsTabFrame() )
            {
                // Remember what was the next of the lower. Formatting may move it to the previous
                // page, in which case it looses its next.
                pNext = pLow->GetNext();

                if (pNext && pNext->IsTabFrame())
                {
                    auto pTab = static_cast<SwTabFrame*>(pNext);
                    if (pTab->IsFollow())
                    {
                        // The next frame is a follow of the previous frame, SwTabFrame::Join() will
                        // delete this one as part of formatting, so forget about it.
                        pNext = nullptr;
                    }
                }

                bTabChanged |= FormatLayoutTab( static_cast<SwTabFrame*>(pLow), bAddRect );
            }
            // Skip the ones already registered for deletion
            else if( !pLow->IsSctFrame() || static_cast<SwSectionFrame*>(pLow)->GetSection() )
            {
                PushFormatLayout(pLow);
                bChanged |= FormatLayout( pRenderContext, static_cast<SwLayoutFrame*>(pLow), bAddRect );
                PopFormatLayout();
            }
        }
        else if ( m_pImp->GetShell()->IsPaintLocked() )
            // Shortcut to minimize the cycles. With Lock, the
            // paint is coming either way (primarily for browse)
            pLow->OptCalc();

        if ( IsAgain() )
            return false;
        if (!pNext)
        {
            pNext = pLow->GetNext();
        }
        pLow = pNext;
    }
    // add complete frame area as paint area, if frame
    // area has been already added and after formatting its lowers the frame area
    // is enlarged.
    SwRect aBoundRect(pLay->IsPageFrame() ? static_cast<SwPageFrame*>(pLay)->GetBoundRect(pRenderContext) : pLay->getFrameArea() );

    if ( bAlreadyPainted &&
         ( aBoundRect.Width() > aFrameAtCompletePaint.Width() ||
           aBoundRect.Height() > aFrameAtCompletePaint.Height() )
       )
    {
        m_pImp->GetShell()->AddPaintRect( aBoundRect );
    }
    return bChanged || bTabChanged;
}

void SwLayAction::FormatLayoutFly( SwFlyFrame* pFly )
{
    vcl::RenderContext* pRenderContext = m_pImp->GetShell()->GetOut();
    OSL_ENSURE( !IsAgain(), "Attention to the invalid page." );
    if ( IsAgain() )
        return;

    bool bChanged = false;
    bool bAddRect = true;

    if ( !pFly->isFrameAreaDefinitionValid() || pFly->IsCompletePaint() || pFly->IsInvalid() )
    {
        // The Frame has changed, now it's getting formatted.
        const SwRect aOldRect( pFly->getFrameArea() );
        pFly->Calc(pRenderContext);
        bChanged = aOldRect != pFly->getFrameArea();

        if ( IsPaint() && (pFly->IsCompletePaint() || bChanged) &&
                    pFly->getFrameArea().Top() > 0 && pFly->getFrameArea().Left() > 0 )
            m_pImp->GetShell()->AddPaintRect( pFly->getFrameArea() );

        if ( bChanged )
            pFly->Invalidate();
        else
            pFly->Validate();

        bAddRect = false;
        pFly->ResetCompletePaint();
    }

    if ( IsAgain() )
        return;

    // Now, deal with the lowers that are LayoutFrames
    SwFrame *pLow = pFly->Lower();
    while ( pLow )
    {
        if ( pLow->IsLayoutFrame() )
        {
            if ( pLow->IsTabFrame() )
                FormatLayoutTab( static_cast<SwTabFrame*>(pLow), bAddRect );
            else
                FormatLayout( m_pImp->GetShell()->GetOut(), static_cast<SwLayoutFrame*>(pLow), bAddRect );
        }
        pLow = pLow->GetNext();
    }
}

// Implement vertical layout support
bool SwLayAction::FormatLayoutTab( SwTabFrame *pTab, bool bAddRect )
{
    OSL_ENSURE( !IsAgain(), "8-) Attention to the invalid page." );
    if ( IsAgain() || !pTab->Lower() )
        return false;

    vcl::RenderContext* pRenderContext = m_pImp->GetShell()->GetOut();
    IDocumentTimerAccess& rTimerAccess = m_pRoot->GetFormat()->getIDocumentTimerAccess();
    rTimerAccess.BlockIdling();

    bool bChanged = false;
    bool bPainted = false;

    const SwPageFrame *pOldPage = pTab->FindPageFrame();

    // vertical layout support
    SwRectFnSet aRectFnSet(pTab);

    if ( !pTab->isFrameAreaDefinitionValid() || pTab->IsCompletePaint() || pTab->IsComplete() )
    {
        if ( pTab->GetPrev() && !pTab->GetPrev()->isFrameAreaDefinitionValid() )
        {
            pTab->GetPrev()->SetCompletePaint();
        }

        const SwRect aOldRect( pTab->getFrameArea() );
        pTab->SetLowersFormatted( false );
        pTab->Calc(pRenderContext);
        if ( aOldRect != pTab->getFrameArea() )
        {
            bChanged = true;
        }
        const SwRect aPaintFrame = pTab->GetPaintArea();

        if ( IsPaint() && bAddRect )
        {
            // add condition <pTab->getFrameArea().HasArea()>
            if ( !pTab->IsCompletePaint() &&
                 pTab->IsComplete() &&
                 ( pTab->getFrameArea().SSize() != pTab->getFramePrintArea().SSize() ||
                   // vertical layout support
                   aRectFnSet.GetLeftMargin(*pTab) ) &&
                 pTab->getFrameArea().HasArea()
               )
            {
                // re-implement calculation of margin rectangles.
                SwRect aMarginRect;

                SwTwips nLeftMargin = aRectFnSet.GetLeftMargin(*pTab);
                if ( nLeftMargin > 0)
                {
                    aMarginRect = pTab->getFrameArea();
                    aRectFnSet.SetWidth( aMarginRect, nLeftMargin );
                    m_pImp->GetShell()->AddPaintRect( aMarginRect );
                }

                if ( aRectFnSet.GetRightMargin(*pTab) > 0)
                {
                    aMarginRect = pTab->getFrameArea();
                    aRectFnSet.SetLeft( aMarginRect, aRectFnSet.GetPrtRight(*pTab) );
                    m_pImp->GetShell()->AddPaintRect( aMarginRect );
                }

                SwTwips nTopMargin = aRectFnSet.GetTopMargin(*pTab);
                if ( nTopMargin > 0)
                {
                    aMarginRect = pTab->getFrameArea();
                    aRectFnSet.SetHeight( aMarginRect, nTopMargin );
                    m_pImp->GetShell()->AddPaintRect( aMarginRect );
                }

                if ( aRectFnSet.GetBottomMargin(*pTab) > 0)
                {
                    aMarginRect = pTab->getFrameArea();
                    aRectFnSet.SetTop( aMarginRect, aRectFnSet.GetPrtBottom(*pTab) );
                    m_pImp->GetShell()->AddPaintRect( aMarginRect );
                }
            }
            else if ( pTab->IsCompletePaint() )
            {
                m_pImp->GetShell()->AddPaintRect( aPaintFrame );
                bAddRect = false;
                bPainted = true;
            }

            if ( pTab->IsRetouche() && !pTab->GetNext() )
            {
                SwRect aRect( pTab->GetUpper()->GetPaintArea() );
                // vertical layout support
                aRectFnSet.SetTop( aRect, aRectFnSet.GetPrtBottom(*pTab) );
                if ( !m_pImp->GetShell()->AddPaintRect( aRect ) )
                    pTab->ResetRetouche();
            }
        }
        else
            bAddRect = false;

        if ( pTab->IsCompletePaint() && !m_pOptTab )
            m_pOptTab = pTab;
        pTab->ResetCompletePaint();
    }
    if ( IsPaint() && bAddRect && pTab->IsRetouche() && !pTab->GetNext() )
    {
        // set correct rectangle for retouche: area between bottom of table frame
        // and bottom of paint area of the upper frame.
        SwRect aRect( pTab->GetUpper()->GetPaintArea() );
        // vertical layout support
        aRectFnSet.SetTop( aRect, aRectFnSet.GetPrtBottom(*pTab) );
        if ( !m_pImp->GetShell()->AddPaintRect( aRect ) )
            pTab->ResetRetouche();
    }

    CheckWaitCursor();

    rTimerAccess.UnblockIdling();

    // Ugly shortcut!
    if ( pTab->IsLowersFormatted() &&
         (bPainted || !m_pImp->GetShell()->VisArea().Overlaps( pTab->getFrameArea())) )
        return false;

    // Now, deal with the lowers
    if ( IsAgain() )
        return false;

    // for safety reasons:
    // check page number before formatting lowers.
    if ( pOldPage->GetPhyPageNum() > (pTab->FindPageFrame()->GetPhyPageNum() + 1) )
        SetNextCycle( true );

    // format lowers, only if table frame is valid
    if ( pTab->isFrameAreaDefinitionValid() )
    {
        FlowFrameJoinLockGuard tabG(pTab); // tdf#124675 prevent Join() if pTab becomes empty
        SwLayoutFrame *pLow = static_cast<SwLayoutFrame*>(pTab->Lower());
        while ( pLow )
        {
            SwFrameDeleteGuard rowG(pLow); // tdf#124675 prevent RemoveFollowFlowLine()
            bChanged |= FormatLayout( m_pImp->GetShell()->GetOut(), pLow, bAddRect );
            if ( IsAgain() )
                return false;
            pLow = static_cast<SwLayoutFrame*>(pLow->GetNext());
        }
    }

    return bChanged;
}

bool SwLayAction::FormatContent(SwPageFrame *const pPage)
{
    ::comphelper::ScopeGuard g([this, pPage]() {
        if (IsAgain())
        {
            return; // pPage probably deleted
        }
        if (auto const* pObjs = pPage->GetSortedObjs())
        {
            std::vector<std::pair<SwAnchoredObject*, SwPageFrame*>> moved;
            for (auto const pObj : *pObjs)
            {
                assert(!pObj->AnchorFrame()->IsTextFrame()
                    || !static_cast<SwTextFrame const*>(pObj->AnchorFrame())->IsFollow());
                SwPageFrame *const pAnchorPage(pObj->AnchorFrame()->FindPageFrame());
                assert(pAnchorPage);
                if (pAnchorPage != pPage
                    && pPage->GetPhyPageNum() < pAnchorPage->GetPhyPageNum()
                    && pObj->GetFrameFormat().GetAnchor().GetAnchorId()
                        != RndStdIds::FLY_AS_CHAR)
                {
                    moved.emplace_back(pObj, pAnchorPage);
                }
            }
            for (auto const& [pObj, pAnchorPage] : moved)
            {
                SAL_INFO("sw.layout", "SwLayAction::FormatContent: move anchored " << pObj << " from " << pPage->GetPhyPageNum() << " to " << pAnchorPage->GetPhyPageNum());
                pObj->RegisterAtPage(*pAnchorPage);
                // tdf#143239 if the position remains valid, it may not be
                // positioned again so would remain on the wrong page!
                pObj->InvalidateObjPos();
                ::Notify_Background(pObj->GetDrawObj(), pPage,
                    pObj->GetObjRect(), PrepareHint::FlyFrameLeave, false);
            }
            if (!moved.empty())
            {
                pPage->InvalidateFlyLayout();
                if (auto *const pContent = pPage->FindLastBodyContent())
                {
                    pContent->InvalidateSize();
                }
            }
        }
    });

    const SwContentFrame *pContent = pPage->ContainsContent();
    const SwViewShell *pSh = m_pRoot->GetCurrShell();
    const bool bBrowse = pSh && pSh->GetViewOptions()->getBrowseMode();

    while ( pContent && pPage->IsAnLower( pContent ) )
    {
        // If the content didn't change, we can use a few shortcuts.
        const bool bFull = !pContent->isFrameAreaDefinitionValid() || pContent->IsCompletePaint() ||
                           pContent->IsRetouche() || pContent->GetDrawObjs();
        if ( bFull )
        {
            // We do this so we don't have to search later on.
            const bool bNxtCnt = IsCalcLayout() && !pContent->GetFollow();
            const SwContentFrame *pContentNext = bNxtCnt ? pContent->GetNextContentFrame() : nullptr;
            SwContentFrame* const pContentPrev = pContent->GetPrev() ? pContent->GetPrevContentFrame() : nullptr;
            std::optional<SfxDeleteListener> oPrevDeleteListener;
            if (pContentPrev)
                oPrevDeleteListener.emplace(*pContentPrev);

            const SwLayoutFrame*pOldUpper  = pContent->GetUpper();
            const SwTabFrame *pTab = pContent->FindTabFrame();
            const bool bInValid = !pContent->isFrameAreaDefinitionValid() || pContent->IsCompletePaint();
            const bool bOldPaint = IsPaint();
            m_bPaint = bOldPaint && !(pTab && pTab == m_pOptTab);
            FormatContent_( pContent, pPage );
            // reset <bPaint> before format objects
            m_bPaint = bOldPaint;

            // format floating screen object at content frame.
            // No format, if action flag <bAgain> is set or action is interrupted.
            // allow format on interruption of action, if
            // it's the format for this interrupt
            // pass correct page frame
            // to the object formatter.
            if ( !IsAgain() &&
                 ( !IsInterrupt() || mbFormatContentOnInterrupt ) &&
                 pContent->IsTextFrame() &&
                 !SwObjectFormatter::FormatObjsAtFrame( *const_cast<SwContentFrame*>(pContent),
                                                      *(pContent->FindPageFrame()), this ) )
            {
                return false;
            }

            if ( !pContent->GetValidLineNumFlag() && pContent->IsTextFrame() )
            {
                const sal_uLong nAllLines = static_cast<const SwTextFrame*>(pContent)->GetAllLines();
                const_cast<SwTextFrame*>(static_cast<const SwTextFrame*>(pContent))->RecalcAllLines();
                if ( IsPaintExtraData() && IsPaint() &&
                     nAllLines != static_cast<const SwTextFrame*>(pContent)->GetAllLines() )
                    m_pImp->GetShell()->AddPaintRect( pContent->getFrameArea() );
            }

            if ( IsAgain() )
                return false;

            // Temporarily interrupt processing if layout or Flys become invalid again.
            // However not for the BrowseView: The layout is getting invalid
            // all the time because the page height gets adjusted.
            // The same applies if the user wants to continue working and at least one
            // paragraph has been processed.
            if (!pTab || !bInValid)
            {
                CheckIdleEnd();
                // consider interrupt formatting.
                if ( ( IsInterrupt() && !mbFormatContentOnInterrupt ) ||
                     ( !bBrowse && pPage->IsInvalidLayout() ) ||
                     // consider interrupt formatting
                     ( pPage->GetSortedObjs() && pPage->IsInvalidFly() && !mbFormatContentOnInterrupt )
                   )
                    return false;
            }
            if ( pOldUpper != pContent->GetUpper() )
            {
                const sal_uInt16 nCurNum = pContent->FindPageFrame()->GetPhyPageNum();
                if (  nCurNum < pPage->GetPhyPageNum() )
                    m_nPreInvaPage = nCurNum;

                // If the frame flowed backwards more than one page, we need to
                // start over again from the beginning, so nothing gets left out.
                if ( !IsCalcLayout() && pPage->GetPhyPageNum() > nCurNum+1 )
                {
                    SetNextCycle( true );
                    // consider interrupt formatting
                    if ( !mbFormatContentOnInterrupt )
                    {
                        return false;
                    }
                }
            }
            // If the frame moved forwards to the next page, we re-run through
            // the predecessor.
            // This way, we catch predecessors which are now responsible for
            // retouching, but the footers will be touched also.
            bool bSetContent = true;
            if ( pContentPrev )
            {
                if (oPrevDeleteListener->WasDeleted())
                {
                    SAL_WARN("sw", "ContentPrev was deleted");
                    return false;
                }

                if ( !pContentPrev->isFrameAreaDefinitionValid() && pPage->IsAnLower( pContentPrev ) )
                {
                    pPage->InvalidateContent();
                }

                if ( pOldUpper != pContent->GetUpper() &&
                     pPage->GetPhyPageNum() < pContent->FindPageFrame()->GetPhyPageNum() )
                {
                    pContent = pContentPrev;
                    bSetContent = false;
                }
            }
            if ( bSetContent )
            {
                if ( bBrowse && !IsIdle() && !IsCalcLayout() && !IsComplete() &&
                     pContent->getFrameArea().Top() > m_pImp->GetShell()->VisArea().Bottom())
                {
                    const tools::Long nBottom = m_pImp->GetShell()->VisArea().Bottom();
                    const SwFrame *pTmp = lcl_FindFirstInvaContent( pPage,
                                                            nBottom, pContent );
                    if ( !pTmp )
                    {
                        if ( (!(pPage->GetSortedObjs() && pPage->IsInvalidFly()) ||
                              !lcl_FindFirstInvaObj( pPage, nBottom )) &&
                              (!pPage->IsInvalidLayout() ||
                               !lcl_FindFirstInvaLay( pPage, nBottom )))
                            SetBrowseActionStop( true );
                        // consider interrupt formatting.
                        if ( !mbFormatContentOnInterrupt )
                        {
                            return false;
                        }
                    }
                }
                pContent = bNxtCnt ? pContentNext : pContent->GetNextContentFrame();
            }

            if (IsReschedule())
            {
                ::RescheduleProgress(m_pImp->GetShell()->GetDoc()->GetDocShell());
            }
        }
        else
        {
            if ( !pContent->GetValidLineNumFlag() && pContent->IsTextFrame() )
            {
                const sal_uLong nAllLines = static_cast<const SwTextFrame*>(pContent)->GetAllLines();
                const_cast<SwTextFrame*>(static_cast<const SwTextFrame*>(pContent))->RecalcAllLines();
                if ( IsPaintExtraData() && IsPaint() &&
                     nAllLines != static_cast<const SwTextFrame*>(pContent)->GetAllLines() )
                    m_pImp->GetShell()->AddPaintRect( pContent->getFrameArea() );
            }

            // Do this if the frame has been formatted before.
            if ( pContent->IsTextFrame() && static_cast<const SwTextFrame*>(pContent)->HasRepaint() &&
                  IsPaint() )
                PaintContent( pContent, pPage, pContent->getFrameArea(), pContent->getFrameArea().Bottom());
            if ( IsIdle() )
            {
                CheckIdleEnd();
                // consider interrupt formatting.
                if ( IsInterrupt() && !mbFormatContentOnInterrupt )
                    return false;
            }
            if ( bBrowse && !IsIdle() && !IsCalcLayout() && !IsComplete() &&
                 pContent->getFrameArea().Top() > m_pImp->GetShell()->VisArea().Bottom())
            {
                const tools::Long nBottom = m_pImp->GetShell()->VisArea().Bottom();
                const SwFrame *pTmp = lcl_FindFirstInvaContent( pPage,
                                                    nBottom, pContent );
                if ( !pTmp )
                {
                    if ( (!(pPage->GetSortedObjs() && pPage->IsInvalidFly()) ||
                            !lcl_FindFirstInvaObj( pPage, nBottom )) &&
                            (!pPage->IsInvalidLayout() ||
                            !lcl_FindFirstInvaLay( pPage, nBottom )))
                        SetBrowseActionStop( true );
                    // consider interrupt formatting.
                    if ( !mbFormatContentOnInterrupt )
                    {
                        return false;
                    }
                }
            }
            pContent = pContent->GetNextContentFrame();
        }
    }
    CheckWaitCursor();
    // consider interrupt formatting.
    return !IsInterrupt() || mbFormatContentOnInterrupt;
}

void SwLayAction::FormatContent_( const SwContentFrame *pContent, const SwPageFrame  *pPage )
{
    // We probably only ended up here because the Content holds DrawObjects.
    const bool bDrawObjsOnly = pContent->isFrameAreaDefinitionValid() && !pContent->IsCompletePaint() && !pContent->IsRetouche();
    SwRectFnSet aRectFnSet(pContent);
    if ( !bDrawObjsOnly && IsPaint() )
    {
        const SwRect aOldRect( pContent->UnionFrame() );
        const tools::Long nOldBottom = aRectFnSet.GetPrtBottom(*pContent);
        pContent->OptCalc();
        if( IsAgain() )
            return;
        if( aRectFnSet.YDiff( aRectFnSet.GetBottom(pContent->getFrameArea()),
                                aRectFnSet.GetBottom(aOldRect) ) < 0 )
        {
            pContent->SetRetouche();
        }
        PaintContent( pContent, pContent->FindPageFrame(), aOldRect, nOldBottom);
    }
    else
    {
        if ( IsPaint() && pContent->IsTextFrame() && static_cast<const SwTextFrame*>(pContent)->HasRepaint() )
            PaintContent( pContent, pPage, pContent->getFrameArea(),
                        aRectFnSet.GetBottom(pContent->getFrameArea()) );
        pContent->OptCalc();
    }
}

void SwLayAction::FormatFlyContent( const SwFlyFrame *pFly )
{
    const SwContentFrame *pContent = pFly->ContainsContent();

    while ( pContent )
    {
        FormatContent_( pContent, pContent->FindPageFrame() );

        // format floating screen objects at content text frame
        // pass correct page frame to the object formatter.
        if ( pContent->IsTextFrame() &&
             !SwObjectFormatter::FormatObjsAtFrame(
                                            *const_cast<SwContentFrame*>(pContent),
                                            *(pContent->FindPageFrame()), this ) )
        {
            // restart format with first content
            pContent = pFly->ContainsContent();
            continue;
        }

        if ( !pContent->GetValidLineNumFlag() && pContent->IsTextFrame() )
        {
            const sal_uLong nAllLines = static_cast<const SwTextFrame*>(pContent)->GetAllLines();
            const_cast<SwTextFrame*>(static_cast<const SwTextFrame*>(pContent))->RecalcAllLines();
            if ( IsPaintExtraData() && IsPaint() &&
                 nAllLines != static_cast<const SwTextFrame*>(pContent)->GetAllLines() )
                m_pImp->GetShell()->AddPaintRect( pContent->getFrameArea() );
        }

        if ( IsAgain() )
            return;

        // If there's input, we interrupt processing.
        if ( !pFly->IsFlyInContentFrame() )
        {
            CheckIdleEnd();
            // consider interrupt formatting.
            if ( IsInterrupt() && !mbFormatContentOnInterrupt )
                return;
        }
        pContent = pContent->GetNextContentFrame();
    }
    CheckWaitCursor();
}

bool SwLayIdle::DoIdleJob_( const SwContentFrame *pCnt, IdleJobType eJob )
{
    OSL_ENSURE( pCnt->IsTextFrame(), "NoText neighbour of Text" );
    // robust against misuse by e.g. #i52542#
    if( !pCnt->IsTextFrame() )
        return false;

    SwTextFrame const*const pTextFrame(static_cast<SwTextFrame const*>(pCnt));
    // sw_redlinehide: spell check only the nodes with visible content?
    SwTextNode* pTextNode = const_cast<SwTextNode*>(pTextFrame->GetTextNodeForParaProps());

    bool bProcess = false;
    for (size_t i = 0; pTextNode; )
    {
        switch ( eJob )
        {
            case ONLINE_SPELLING :
                bProcess = pTextNode->IsWrongDirty(); break;
            case AUTOCOMPLETE_WORDS :
                bProcess = pTextNode->IsAutoCompleteWordDirty(); break;
            case WORD_COUNT :
                bProcess = pTextNode->IsWordCountDirty(); break;
            case SMART_TAGS :
                bProcess = pTextNode->IsSmartTagDirty(); break;
        }
        if (bProcess)
        {
            break;
        }
        if (sw::MergedPara const* pMerged = pTextFrame->GetMergedPara())
        {
            while (true)
            {
                ++i;
                if (i < pMerged->extents.size())
                {
                    if (pMerged->extents[i].pNode != pTextNode)
                    {
                        pTextNode = pMerged->extents[i].pNode;
                        break;
                    }
                }
                else
                {
                    pTextNode = nullptr;
                    break;
                }
            }
        }
        else
            pTextNode = nullptr;
    }

    if( bProcess )
    {
        assert(pTextNode);
        SwViewShell *pSh = m_pImp->GetShell();
        if( COMPLETE_STRING == m_nTextPos )
        {
            --m_nTextPos;
            if( auto pCursorShell = dynamic_cast<SwCursorShell *>( pSh ) )
                if( !pCursorShell->IsTableMode() )
                {
                    SwPaM *pCursor = pCursorShell->GetCursor();
                    if( !pCursor->HasMark() && !pCursor->IsMultiSelection() )
                    {
                        m_pContentNode = pCursor->GetContentNode();
                        m_nTextPos =  pCursor->GetPoint()->nContent.GetIndex();
                    }
                }
        }
        sal_Int32 const nPos((m_pContentNode && pTextNode == m_pContentNode)
                ? m_nTextPos
                : COMPLETE_STRING);

        switch ( eJob )
        {
            case ONLINE_SPELLING :
            {
                SwRect aRepaint( const_cast<SwTextFrame*>(pTextFrame)->AutoSpell_(*pTextNode, nPos) );
                // PENDING should stop idle spell checking
                m_bPageValid = m_bPageValid && (SwTextNode::WrongState::TODO != pTextNode->GetWrongDirty());
                if ( aRepaint.HasArea() )
                    m_pImp->GetShell()->InvalidateWindows( aRepaint );
                if (Application::AnyInput(VCL_INPUT_ANY & VclInputFlags(~VclInputFlags::TIMER)))
                    return true;
                break;
            }
            case AUTOCOMPLETE_WORDS :
                const_cast<SwTextFrame*>(pTextFrame)->CollectAutoCmplWrds(*pTextNode, nPos);
                // note: bPageValid remains true here even if the cursor
                // position is skipped, so no PENDING state needed currently
                if (Application::AnyInput(VCL_INPUT_ANY & VclInputFlags(~VclInputFlags::TIMER)))
                    return true;
                break;
            case WORD_COUNT :
            {
                const sal_Int32 nEnd = pTextNode->GetText().getLength();
                SwDocStat aStat;
                pTextNode->CountWords( aStat, 0, nEnd );
                if ( Application::AnyInput() )
                    return true;
                break;
            }
            case SMART_TAGS :
            {
                try {
                    const SwRect aRepaint( const_cast<SwTextFrame*>(pTextFrame)->SmartTagScan(*pTextNode) );
                    m_bPageValid = m_bPageValid && !pTextNode->IsSmartTagDirty();
                    if ( aRepaint.HasArea() )
                        m_pImp->GetShell()->InvalidateWindows( aRepaint );
                } catch( const css::uno::RuntimeException&) {
                    // handle smarttag problems gracefully and provide diagnostics
                    TOOLS_WARN_EXCEPTION( "sw.core", "SMART_TAGS");
                }
                if (Application::AnyInput(VCL_INPUT_ANY & VclInputFlags(~VclInputFlags::TIMER)))
                    return true;
                break;
            }
        }
    }

    // The Flys that are anchored to the paragraph need to be considered too.
    if ( pCnt->GetDrawObjs() )
    {
        const SwSortedObjs &rObjs = *pCnt->GetDrawObjs();
        for (SwAnchoredObject* pObj : rObjs)
        {
            if ( auto pFly = pObj->DynCastFlyFrame() )
            {
                if ( pFly->IsFlyInContentFrame() )
                {
                    const SwContentFrame *pC = pFly->ContainsContent();
                    while( pC )
                    {
                        if ( pC->IsTextFrame() )
                        {
                            if ( DoIdleJob_( pC, eJob ) )
                                return true;
                        }
                        pC = pC->GetNextContentFrame();
                    }
                }
            }
        }
    }
    return false;
}

bool SwLayIdle::DoIdleJob( IdleJobType eJob, bool bVisAreaOnly )
{
    // Spellcheck all contents of the pages. Either only the
    // visible ones or all of them.
    const SwViewShell* pViewShell = m_pImp->GetShell();
    const SwViewOption* pViewOptions = pViewShell->GetViewOptions();
    const SwDoc* pDoc = pViewShell->GetDoc();

    switch ( eJob )
    {
        case ONLINE_SPELLING :
            if( !pViewOptions->IsOnlineSpell() )
                return false;
            break;
        case AUTOCOMPLETE_WORDS :
            if( !SwViewOption::IsAutoCompleteWords() ||
                 SwDoc::GetAutoCompleteWords().IsLockWordLstLocked())
                return false;
            break;
        case WORD_COUNT :
            if ( !pViewShell->getIDocumentStatistics().GetDocStat().bModified )
                return false;
            break;
        case SMART_TAGS :
            if ( pDoc->GetDocShell()->IsHelpDocument() ||
                 pDoc->isXForms() ||
                !SwSmartTagMgr::Get().IsSmartTagsEnabled() )
                return false;
            break;
        default: OSL_FAIL( "Unknown idle job type" );
    }

    SwPageFrame *pPage;
    if ( bVisAreaOnly )
        pPage = m_pImp->GetFirstVisPage(pViewShell->GetOut());
    else
        pPage = static_cast<SwPageFrame*>(m_pRoot->Lower());

    m_pContentNode = nullptr;
    m_nTextPos = COMPLETE_STRING;

    while ( pPage )
    {
        m_bPageValid = true;
        const SwContentFrame *pCnt = pPage->ContainsContent();
        while( pCnt && pPage->IsAnLower( pCnt ) )
        {
            if ( DoIdleJob_( pCnt, eJob ) )
            {
                SAL_INFO("sw.idle", "DoIdleJob " << eJob << " interrupted on page " << pPage->GetPhyPageNum());
                return true;
            }
            pCnt = pCnt->GetNextContentFrame();
        }
        if ( pPage->GetSortedObjs() )
        {
            for ( size_t i = 0; pPage->GetSortedObjs() &&
                                i < pPage->GetSortedObjs()->size(); ++i )
            {
                const SwAnchoredObject* pObj = (*pPage->GetSortedObjs())[i];
                if ( auto pFly = pObj->DynCastFlyFrame() )
                {
                    const SwContentFrame *pC = pFly->ContainsContent();
                    while( pC )
                    {
                        if ( pC->IsTextFrame() )
                        {
                            if ( DoIdleJob_( pC, eJob ) )
                            {
                                SAL_INFO("sw.idle", "DoIdleJob " << eJob << " interrupted on page " << pPage->GetPhyPageNum());
                                return true;
                            }
                        }
                        pC = pC->GetNextContentFrame();
                    }
                }
            }
        }

        if( m_bPageValid )
        {
            switch ( eJob )
            {
                case ONLINE_SPELLING : pPage->ValidateSpelling(); break;
                case AUTOCOMPLETE_WORDS : pPage->ValidateAutoCompleteWords(); break;
                case WORD_COUNT : pPage->ValidateWordCount(); break;
                case SMART_TAGS : pPage->ValidateSmartTags(); break;
            }
        }

        pPage = static_cast<SwPageFrame*>(pPage->GetNext());
        if ( pPage && bVisAreaOnly &&
             !pPage->getFrameArea().Overlaps( m_pImp->GetShell()->VisArea()))
             break;
    }
    return false;
}

#if HAVE_FEATURE_DESKTOP && defined DBG_UTIL
void SwLayIdle::ShowIdle( Color eColor )
{
    if ( m_bIndicator )
        return;

    m_bIndicator = true;
    vcl::Window *pWin = m_pImp->GetShell()->GetWin();
    if (pWin && !pWin->SupportsDoubleBuffering()) // FIXME make this work with double-buffering
    {
        tools::Rectangle aRect( 0, 0, 5, 5 );
        aRect = pWin->PixelToLogic( aRect );
        // Depending on if idle layout is in progress or not, draw a "red square" or a "green square".
        pWin->GetOutDev()->Push( vcl::PushFlags::FILLCOLOR|vcl::PushFlags::LINECOLOR );
        pWin->GetOutDev()->SetFillColor( eColor );
        pWin->GetOutDev()->SetLineColor();
        pWin->GetOutDev()->DrawRect( aRect );
        pWin->GetOutDev()->Pop();
    }
}
#define SHOW_IDLE( Color ) ShowIdle( Color )
#else
#define SHOW_IDLE( Color )
#endif // DBG_UTIL

SwLayIdle::SwLayIdle( SwRootFrame *pRt, SwViewShellImp *pI ) :
    m_pRoot( pRt ),
    m_pImp( pI )
#ifdef DBG_UTIL
    , m_bIndicator( false )
#endif
{
    SAL_INFO("sw.idle", "SwLayIdle() entry");

    m_pImp->m_pIdleAct = this;

    SHOW_IDLE( COL_LIGHTRED );

    m_pImp->GetShell()->EnableSmooth( false );

    // First, spellcheck the visible area. Only if there's nothing
    // to do there, we trigger the IdleFormat.
    if ( !DoIdleJob( SMART_TAGS, true ) &&
         !DoIdleJob( ONLINE_SPELLING, true ) &&
         !DoIdleJob( AUTOCOMPLETE_WORDS, true ) )
    {
        // Format, then register repaint rectangles with the SwViewShell if necessary.
        // This requires running artificial actions, so we don't get undesired
        // effects when for instance the page count gets changed.
        // We remember the shells where the cursor is visible, so we can make
        // it visible again if needed after a document change.
        std::vector<bool> aBools;
        for(SwViewShell& rSh : m_pImp->GetShell()->GetRingContainer())
        {
            ++rSh.mnStartAction;
            bool bVis = false;
            if ( auto pCursorShell = dynamic_cast<SwCursorShell*>( &rSh) )
            {
                bVis = pCursorShell->GetCharRect().Overlaps(rSh.VisArea());
            }
            aBools.push_back( bVis );
        }

        bool bInterrupt(false);
        {
            SwLayAction aAction( m_pRoot, m_pImp );
            aAction.SetInputType( VCL_INPUT_ANY & VclInputFlags(~VclInputFlags::TIMER) );
            aAction.SetIdle( true );
            aAction.SetWaitAllowed( false );
            aAction.Action(m_pImp->GetShell()->GetOut());
            bInterrupt = aAction.IsInterrupt();
        }

        // Further start/end actions only happen if there were paints started
        // somewhere or if the visibility of the CharRects has changed.
        bool bActions = false;
        size_t nBoolIdx = 0;
        for(SwViewShell& rSh : m_pImp->GetShell()->GetRingContainer())
        {
            --rSh.mnStartAction;

            if ( rSh.Imp()->HasPaintRegion() )
                bActions = true;
            else
            {
                SwRect aTmp( rSh.VisArea() );
                rSh.UISizeNotify();

                // Are we supposed to crash if rSh isn't a cursor shell?!
                // bActions |= aTmp != rSh.VisArea() ||
                //             aBools[nBoolIdx] != ((SwCursorShell*)&rSh)->GetCharRect().IsOver( rSh.VisArea() );

                // aBools[ i ] is true, if the i-th shell is a cursor shell (!!!)
                // and the cursor is visible.
                bActions |= aTmp != rSh.VisArea();
                if ( aTmp == rSh.VisArea() )
                    if ( auto pCursorShell = dynamic_cast< SwCursorShell*>( &rSh) )
                        bActions |= aBools[nBoolIdx] != pCursorShell->GetCharRect().Overlaps( rSh.VisArea() );
            }

            ++nBoolIdx;
        }

        if ( bActions )
        {
            // Prepare start/end actions via CursorShell, so the cursor, selection
            // and VisArea can be set correctly.
            nBoolIdx = 0;
            for(SwViewShell& rSh : m_pImp->GetShell()->GetRingContainer())
            {
                SwCursorShell* pCursorShell = dynamic_cast<SwCursorShell*>( &rSh);

                if ( pCursorShell )
                    pCursorShell->SttCursorMove();

                // If there are accrued paints, it's best to simply invalidate
                // the whole window. Otherwise there would arise paint problems whose
                // solution would be disproportionally expensive.
                SwViewShellImp *pViewImp = rSh.Imp();
                bool bUnlock = false;
                if ( pViewImp->HasPaintRegion() )
                {
                    pViewImp->DeletePaintRegion();

                    // Cause a repaint with virtual device.
                    rSh.LockPaint();
                    bUnlock = true;
                }

                if ( pCursorShell )
                    // If the Cursor was visible, we need to make it visible again.
                    // Otherwise, EndCursorMove with true for IdleEnd
                    pCursorShell->EndCursorMove( !aBools[nBoolIdx] );
                if( bUnlock )
                {
                    if( pCursorShell )
                    {
                        // UnlockPaint overwrite the selection from the
                        // CursorShell and calls the virtual method paint
                        // to fill the virtual device. This fill don't have
                        // paint the selection! -> Set the focus flag at
                        // CursorShell and it doesn't paint the selection.
                        pCursorShell->ShellLoseFocus();
                        pCursorShell->UnlockPaint( true );
                        pCursorShell->ShellGetFocus();
                    }
                    else
                        rSh.UnlockPaint( true );
                }
                ++nBoolIdx;

            }
        }

        if (!bInterrupt)
        {
            if ( !DoIdleJob( WORD_COUNT, false ) )
                if ( !DoIdleJob( SMART_TAGS, false ) )
                    if ( !DoIdleJob( ONLINE_SPELLING, false ) )
                        DoIdleJob( AUTOCOMPLETE_WORDS, false );
        }

        bool bInValid = false;
        const SwViewOption& rVOpt = *m_pImp->GetShell()->GetViewOptions();
        const SwViewShell* pViewShell = m_pImp->GetShell();
        // See conditions in DoIdleJob()
        const bool bSpell     = rVOpt.IsOnlineSpell();
        const bool bACmplWrd  = SwViewOption::IsAutoCompleteWords();
        const bool bWordCount = pViewShell->getIDocumentStatistics().GetDocStat().bModified;
        const bool bSmartTags = !pViewShell->GetDoc()->GetDocShell()->IsHelpDocument() &&
                                !pViewShell->GetDoc()->isXForms() &&
                                SwSmartTagMgr::Get().IsSmartTagsEnabled();

        SwPageFrame *pPg = static_cast<SwPageFrame*>(m_pRoot->Lower());
        do
        {
            bInValid = pPg->IsInvalidContent()    || pPg->IsInvalidLayout() ||
                       pPg->IsInvalidFlyContent() || pPg->IsInvalidFlyLayout() ||
                       pPg->IsInvalidFlyInCnt() ||
                       (bSpell && pPg->IsInvalidSpelling()) ||
                       (bACmplWrd && pPg->IsInvalidAutoCompleteWords()) ||
                       (bWordCount && pPg->IsInvalidWordCount()) ||
                       (bSmartTags && pPg->IsInvalidSmartTags());

            pPg = static_cast<SwPageFrame*>(pPg->GetNext());

        } while ( pPg && !bInValid );

        if ( !bInValid )
        {
            m_pRoot->ResetIdleFormat();
            SfxObjectShell* pDocShell = m_pImp->GetShell()->GetDoc()->GetDocShell();
            pDocShell->Broadcast( SfxEventHint( SfxEventHintId::SwEventLayoutFinished, SwDocShell::GetEventName(STR_SW_EVENT_LAYOUT_FINISHED), pDocShell ) );
        }
    }

    m_pImp->GetShell()->EnableSmooth( true );

#if !ENABLE_WASM_STRIP_ACCESSIBILITY
    if( m_pImp->IsAccessible() )
        m_pImp->FireAccessibleEvents();
#endif

    SAL_INFO("sw.idle", "SwLayIdle() return");

#ifdef DBG_UTIL
    if ( m_bIndicator && m_pImp->GetShell()->GetWin() )
    {
        // Do not invalidate indicator, this may cause an endless loop. Instead, just repaint it
        // This should be replaced by an overlay object in the future, anyways. Since it's only for debug
        // purposes, it is not urgent.
            m_bIndicator = false; SHOW_IDLE( COL_LIGHTGREEN );
    }
#endif
}

SwLayIdle::~SwLayIdle()
{
    m_pImp->m_pIdleAct = nullptr;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */