Do not set is_category/is_tax/is_tax for is_singular requests. props mtekk. fixes #15487

git-svn-id: http://svn.automattic.com/wordpress/trunk@16495 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/query.php

@@ -1591,6 +1591,7 @@ class WP_Query {
 			);
 		}
 
+		if ( !$this->is_singular() ) {
 			foreach ( $tax_query as $query ) {
 				if ( 'IN' == $query['operator'] ) {
 					switch ( $query['taxonomy'] ) {
@@ -1605,6 +1606,7 @@ class WP_Query {
 					}
 				}
 			}
+		}
 
 		return $tax_query;
 	}