this should be a ref

mistake in commit
    commit f6063153db8951ca21ac3a2e36973f1d73eda4d1
    tdf#117706 Multi-select copying rows between sheets broken
noticed by erack

Change-Id: Ia5ed3726c8f02750eec3551f7dd908120edb2553
Reviewed-on: https://gerrit.libreoffice.org/54765Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sc/source/core/data/document.cxx

@@ -3133,7 +3133,7 @@ void ScDocument::GetClipArea(SCCOL& nClipX, SCROW& nClipY, bool bIncludeFiltered
     SCROW nEndRow   = rRange.aEnd.Row();
     for ( size_t i = 1, n = rClipRanges.size(); i < n; ++i )
     {
-        ScRange const rRange2 = rClipRanges[ i ];
+        ScRange const & rRange2 = rClipRanges[ i ];
         if (rRange2.aStart.Col() < nStartCol)
             nStartCol = rRange2.aStart.Col();
         if (rRange2.aStart.Row() < nStartRow)