toolkit: a micro-optimization taking min and max simulnateously

Change-Id: I161dd318b1e5729ef0b8c55a41c0eddc681b153f
Reviewed-on: https://gerrit.libreoffice.org/57612
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

toolkit/source/controls/grid/defaultgriddatamodel.cxx

@@ -404,8 +404,9 @@ private:
             rDataRow[ columnIndex ].first = i_values[ col ];
         }
 
-        sal_Int32 const firstAffectedColumn = *::std::min_element( i_columnIndexes.begin(), i_columnIndexes.end() );
-        sal_Int32 const lastAffectedColumn = *::std::max_element( i_columnIndexes.begin(), i_columnIndexes.end() );
+        auto aPair = ::std::minmax_element( i_columnIndexes.begin(), i_columnIndexes.end() );
+        sal_Int32 const firstAffectedColumn = *aPair.first;
+        sal_Int32 const lastAffectedColumn = *aPair.second;
         broadcast(
             GridDataEvent( *this, firstAffectedColumn, lastAffectedColumn, i_rowIndex, i_rowIndex ),
             &XGridDataListener::dataChanged,