Re-add the ability to filter by 'taxonomy' and 'term' query vars. Fixes #13582. See #12891

git-svn-id: https://develop.svn.wordpress.org/trunk@15850 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/query.php

@@ -1449,6 +1449,13 @@ class WP_Query extends WP_Object_Query {
 			$tax_query = array();
 		}
 
+		if ( !empty($q['taxonomy']) && !empty($q['term']) ) {
+			$tax_query[] = array(
+				'taxonomy' => $q['taxonomy'],
+				'terms' => $q['term'],
+			);
+		}
+
 		foreach ( $GLOBALS['wp_taxonomies'] as $taxonomy => $t ) {
 			if ( $t->query_var && !empty( $q[$t->query_var] ) ) {
 				$tax_query_defaults = array(