fdo#42286 call correctly GetDataArea to avoid unwanted shrinking

GetDataArea flags documented and call from ExtendedDataArea adapted.

sc/source/core/data/table1.cxx

@@ -741,9 +741,12 @@ bool ScTable::GetDataStart( SCCOL& rStartCol, SCROW& rStartRow ) const
 void ScTable::GetDataArea( SCCOL& rStartCol, SCROW& rStartRow, SCCOL& rEndCol, SCROW& rEndRow,
                            bool bIncludeOld, bool bOnlyDown ) const
 {
-    bool bLeft       = false;
+    // bIncludeOld = true ensure that the returned area contains at least the initial area,
+    //              independently of the case if this area has empty rows / columns at its borders
+    // bOnlyDown = true means extend the inputed area only down, i.e increase only rEndRow
+    bool bLeft = false;
     bool bRight  = false;
-    bool bTop        = false;
+    bool bTop = false;
     bool bBottom = false;
     bool bChanged;
     bool bFound;

sc/source/core/tool/dbdata.cxx

@@ -548,7 +548,7 @@ void ScDBData::ExtendDataArea(ScDocument* pDoc)
     // Extend the DB area to include data rows immediately below.
     SCCOL nCol1a = nStartCol, nCol2a = nEndCol;
     SCROW nRow1a = nStartRow, nRow2a = nEndRow;
-    pDoc->GetDataArea(nTable, nCol1a, nRow1a, nCol2a, nRow2a, false, false);
+    pDoc->GetDataArea(nTable, nCol1a, nRow1a, nCol2a, nRow2a, true, true);
     nEndRow = nRow2a;
 }