Resolves: tdf#113537 don't keep nEndRow=MAXROW if data ends above

Change-Id: I186034cada9718c067fa4dc7f72e2ca55ac06f83

sc/source/core/tool/dbdata.cxx

@@ -624,7 +624,12 @@ void ScDBData::ExtendDataArea(const ScDocument* pDoc)
     SCCOL nOldCol1 = nStartCol, nOldCol2 = nEndCol;
     SCROW nOldEndRow = nEndRow;
     pDoc->GetDataArea(nTable, nStartCol, nStartRow, nEndCol, nEndRow, false, true);
-    nEndRow = std::max(nEndRow, nOldEndRow);
+    // nOldEndRow==MAXROW may easily happen when selecting whole columns and
+    // setting an AutoFilter (i.e. creating an anonymous database-range). We
+    // certainly don't want to iterate over nearly a million empty cells, but
+    // keep only an intentionally user selected range.
+    if (nOldEndRow < MAXROW && nEndRow < nOldEndRow)
+        nEndRow = nOldEndRow;
     if (nStartCol != nOldCol1 || nEndCol != nOldCol2)
     {
         SAL_WARN_IF( !maTableColumnNames.empty(), "sc.core", "ScDBData::ExtendDataArea - invalidating column names/offsets");