If PATH_INFO contains the index, don't use it for permalinks. Props gslin. fixes #1591

git-svn-id: https://develop.svn.wordpress.org/trunk@2852 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/classes.php

@@ -1365,7 +1365,7 @@ class WP {
 
 				// The requested permalink is in $pathinfo for path info requests and
 				//  $req_uri for other requests.
-				if (! empty($pathinfo)) {
+				if (! empty($pathinfo) && ($wp_rewrite->index != $pathinfo)) {
 					$request = $pathinfo;
 				} else {
 					$request = $req_uri;