tdf67629 FILEOPEN Particular .xlsx hangs Spreadsheet

Seems like this is a somewhat pathological document, has lots of
duplicated ranges. Checking for duplicates makes it load in <10s on my
machine

Change-Id: I25da24e0f8b1d4ad99d00474be168c75586ea579
Reviewed-on: https://gerrit.libreoffice.org/71251
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sc/source/filter/oox/sheetdatabuffer.cxx

@@ -663,6 +663,9 @@ void SheetDataBuffer::setCellFormat( const CellModel& rModel )
          * It is sufficient to check if the row range size is one
          */
         if (!rRangeList.empty() &&
+            *pLastRange == rModel.maCellAddr)
+            ; // do nothing - this probably bad data
+        else if (!rRangeList.empty() &&
             pLastRange->aStart.Tab() == rModel.maCellAddr.Tab() &&
             pLastRange->aStart.Row() == pLastRange->aEnd.Row() &&
             pLastRange->aStart.Row() == rModel.maCellAddr.Row() &&