Resolves: tdf#99360 Revert "tdf#93889 Remove a busy loop"

This reverts commit 6610ad9aee0c8299880cd1da6cd6a756860ccad9.

It simply doesn't work, the dialog ends up being modal because
bRefInputMode is always false.

Calling SyncFocusState() in ctor doesn't help because
pEdFilterArea->HasFocus() returns false even if we just called
pEdFilterArea->GrabFocus() ... why?

Also manipulating things with

    pRefInputEdit = pEdFilterArea;
    bRefInputMode = true;

doesn't help. This is odd..

 Conflicts:
	sc/source/ui/dbgui/sfiltdlg.cxx

Change-Id: I90fc8cd99a2ab91dd581acfc51d7ca5eea8e1f61
diff --git a/sc/source/ui/dbgui/sfiltdlg.cxx b/sc/source/ui/dbgui/sfiltdlg.cxx
index d990a2f..4cbe66f 100644
--- a/sc/source/ui/dbgui/sfiltdlg.cxx
+++ b/sc/source/ui/dbgui/sfiltdlg.cxx
@@ -18,6 +18,7 @@
 */

#include <sfx2/dispatch.hxx>
#include <vcl/idle.hxx>

#include "uiitems.hxx"
#include "rangenam.hxx"
@@ -56,7 +57,8 @@ ScSpecialFilterDlg::ScSpecialFilterDlg( SfxBindings* pB, SfxChildWindow* pCW, vc
        pViewData       ( nullptr ),
        pDoc            ( nullptr ),
        pRefInputEdit   ( nullptr ),
        bRefInputMode   ( false )
        bRefInputMode   ( false ),
        pIdle          ( nullptr )
{
        get(pLbFilterArea,"lbfilterarea");
        get(pEdFilterArea,"edfilterarea");
@@ -82,6 +84,13 @@ ScSpecialFilterDlg::ScSpecialFilterDlg( SfxBindings* pB, SfxChildWindow* pCW, vc

    Init( rArgSet );
    pEdFilterArea->GrabFocus();

    // Hack: RefInput-Kontrolle
    pIdle = new Idle;
    // FIXME: this is an abomination
    pIdle->SetPriority( SchedulerPriority::LOWEST );
    pIdle->SetIdleHdl( LINK( this, ScSpecialFilterDlg, TimeOutHdl ) );
    pIdle->Start();
}

ScSpecialFilterDlg::~ScSpecialFilterDlg()
@@ -100,6 +109,10 @@ void ScSpecialFilterDlg::dispose()

    delete pOutItem;

    // Hack: RefInput-Kontrolle
    pIdle->Stop();
    delete pIdle;

    pLbFilterArea.clear();
    pEdFilterArea.clear();
    pRbFilterArea.clear();
@@ -212,7 +225,6 @@ bool ScSpecialFilterDlg::Close()

void ScSpecialFilterDlg::SetReference( const ScRange& rRef, ScDocument* pDocP )
{
    SyncFocusState();
    if ( bRefInputMode && pRefInputEdit )       // Nur moeglich, wenn im Referenz-Editmodus
    {
        if ( rRef.aStart != rRef.aEnd )
@@ -232,7 +244,6 @@ void ScSpecialFilterDlg::SetReference( const ScRange& rRef, ScDocument* pDocP )

void ScSpecialFilterDlg::SetActive()
{
    SyncFocusState();
    if ( bRefInputMode )
    {
        if ( pRefInputEdit == pEdCopyArea )
@@ -385,24 +396,30 @@ IMPL_LINK_TYPED( ScSpecialFilterDlg, EndDlgHdl, Button*, pBtn, void )
    }
}


void ScSpecialFilterDlg::SyncFocusState()
IMPL_LINK_TYPED( ScSpecialFilterDlg, TimeOutHdl, Idle*, _pIdle, void )
{
    if( pEdCopyArea->HasFocus() || pRbCopyArea->HasFocus() )
    // every 50ms check whether RefInputMode is still true

    if( (_pIdle == pIdle) && IsActive() )
    {
        pRefInputEdit = pEdCopyArea;
        bRefInputMode = true;
        if( pEdCopyArea->HasFocus() || pRbCopyArea->HasFocus() )
        {
            pRefInputEdit = pEdCopyArea;
            bRefInputMode = true;
        }
        else if( pEdFilterArea->HasFocus() || pRbFilterArea->HasFocus() )
        {
            pRefInputEdit = pEdFilterArea;
            bRefInputMode = true;
        }
        else if( bRefInputMode )
        {
            pRefInputEdit = nullptr;
            bRefInputMode = false;
        }
    }
    else if( pEdFilterArea->HasFocus() || pRbFilterArea->HasFocus() )
    {
        pRefInputEdit = pEdFilterArea;
        bRefInputMode = true;
    }
    else if( bRefInputMode )
    {
        pRefInputEdit = nullptr;
        bRefInputMode = false;
    }

    pIdle->Start();
}

IMPL_LINK_TYPED( ScSpecialFilterDlg, FilterAreaSelHdl, ListBox&, rLb, void )
diff --git a/sc/source/ui/inc/filtdlg.hxx b/sc/source/ui/inc/filtdlg.hxx
index 98f7d4d..2e3e8b9 100644
--- a/sc/source/ui/inc/filtdlg.hxx
+++ b/sc/source/ui/inc/filtdlg.hxx
@@ -64,6 +64,7 @@ public:

    virtual bool    IsRefInputMode() const override;
    virtual void    SetActive() override;

    virtual bool    Close() override;
    void            SliderMoved();
    size_t          GetSliderPos();
@@ -167,7 +168,7 @@ public:
    virtual void    dispose() override;

    virtual void    SetReference( const ScRange& rRef, ScDocument* pDoc ) override;
    void            SyncFocusState();

    virtual bool    IsRefInputMode() const override;
    virtual void    SetActive() override;

@@ -206,6 +207,8 @@ private:
    VclPtr<formula::RefEdit>   pRefInputEdit;
    bool                bRefInputMode;

    // Hack: RefInput control
    Idle*  pIdle;

private:
    void            Init( const SfxItemSet& rArgSet );