tdf#108560 horribly slow to paste many lines into editeng with a11y active

looks to me that once the bound rect (and visible children) are synced
that they won't change again so continued recalculation of bounds
doesn't achieve anything except super expensive calc for no effect.

Change-Id: I1684e3724bca28d03f7c255c2d7a40eee1b70eae
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137497
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit 8e5c1982c41c234027245fe2da6bf9bc3f5fe238)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137521
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
(cherry picked from commit 85a1e6d32f7b7b2143162d78ed99b3dac686434e)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137597
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
Tested-by: Xisco Fauli <xiscofauli@libreoffice.org>
diff --git a/svx/source/accessibility/AccessibleTextHelper.cxx b/svx/source/accessibility/AccessibleTextHelper.cxx
index 2fa4c0a..809bd25 100644
--- a/svx/source/accessibility/AccessibleTextHelper.cxx
+++ b/svx/source/accessibility/AccessibleTextHelper.cxx
@@ -1118,6 +1118,8 @@ namespace accessibility
            bEverythingUpdated = true;
        }

        bool bUpdatedBoundRectAndVisibleChildren(false);

        while( !maEventQueue.IsEmpty() )
        {
            ::std::unique_ptr< SfxHint > pHint( maEventQueue.PopFront() );
@@ -1252,14 +1254,22 @@ namespace accessibility
                        }

                        // in all cases, check visibility afterwards.
                        UpdateVisibleChildren();
                        UpdateBoundRect();
                        if (!bUpdatedBoundRectAndVisibleChildren)
                        {
                            UpdateVisibleChildren();
                            UpdateBoundRect();
                            bUpdatedBoundRectAndVisibleChildren = true;
                        }
                    }
                    else if ( dynamic_cast<const SvxViewChangedHint*>( &rHint ) )
                    {
                        // just check visibility
                        UpdateVisibleChildren();
                        UpdateBoundRect();
                        if (!bUpdatedBoundRectAndVisibleChildren)
                        {
                            UpdateVisibleChildren();
                            UpdateBoundRect();
                            bUpdatedBoundRectAndVisibleChildren = true;
                        }
                    }
                    // it's VITAL to keep the SfxSimpleHint last! It's the base of some classes above!
                    else if( rHint.GetId() == SfxHintId::Dying)