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Created attachment 7047 [details]
diff patch

In SpecialRecentChangesQuery function doMainQuery hook parameters should also pass $query_options to enable external modification such as 'group by rc_namespace, rc_title'

wfRunHooks('SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts ) );

 ==>

wfRunHooks('SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts, &$query_options ) );

The hook call lacks also checking the return value (a false return value should skip/abort further processing in case the extension took over processing).