Ticket #12891: 12891-cat-query-var.patch

wp-includes/query.php

@@ -1901 +1901 @@
                         $where .= $this->get_tax_sql( $q['tax_query'], "$wpdb->posts.ID" );
 
                         // Back-compat
-                        if ( !empty( $ids ) ) {
-                                $cat_query = wp_list_filter( $q['tax_query'], array( 'taxonomy' => 'category' ) );
-                                if ( !empty( $cat_query ) ) {
-                                        $cat_query = reset( $cat_query );
-                                        $cat = get_term_by( $cat_query['field'], $cat_query['terms'][0], 'category' );
-                                        if ( $cat ) {
-                                                $this->set('cat', $cat->term_id);
-                                                $this->set('category_name', $cat->slug);
-                                        }
+                        $cat_query = wp_list_filter( $q['tax_query'], array( 'taxonomy' => 'category' ) );
+                        if ( !empty( $cat_query ) ) {
+                                $cat_query = reset( $cat_query );
+                                $cat = get_term_by( $cat_query['field'], $cat_query['terms'][0], 'category' );
+                                if ( $cat ) {
+                                        $this->set( 'cat', $cat->term_id );
+                                        $this->set( 'category_name', $cat->slug );
                                 }
                         }
-
-                        unset( $ids );
                 }
 
                 if ( !empty($q['meta_key']) ) {