Related: #i119624# GetUpperSpaceAmountConsideredForPrevFrmAndPageGrid

- consider upper space amount only for page grids in squared page mode

Found by: louqle <louqingle at gmail dot com>
Patch by: Oliver-Rainer Wittmann <orw at apache dot org>
Review by: zjchen <zjchencdl at gmail dot com>
(cherry picked from commit 53ba6061)

Change-Id: If6592a41f0ef67cc20fa8b3ddaefa36571561f85

sw/source/core/layout/flowfrm.cxx

@@ -1733,7 +1733,9 @@ SwTwips SwFlowFrm::GetUpperSpaceAmountConsideredForPrevFrmAndPageGrid() const
     {
         nUpperSpaceAmountConsideredForPrevFrmAndPageGrid =
             _GetUpperSpaceAmountConsideredForPrevFrm() +
-            _GetUpperSpaceAmountConsideredForPageGrid( CalcUpperSpace( 0L, 0L, false ) );
+            ( rThis.GetUpper()->GetFmt()->GetDoc()->IsSquaredPageMode()
+              ? _GetUpperSpaceAmountConsideredForPageGrid( CalcUpperSpace( 0, 0, false ) )
+              : 0 );
     }
 
     return nUpperSpaceAmountConsideredForPrevFrmAndPageGrid;