Ticket #16226: Add plus to special chars.diff

wp-includes/formatting.php

@@ -681 +681 @@
  */
 function sanitize_file_name( $filename ) {
         $filename_raw = $filename;
-        $special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}", chr(0));
+        $special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}", "%", "+", chr(0));
         $special_chars = apply_filters('sanitize_file_name_chars', $special_chars, $filename_raw);
         $filename = str_replace($special_chars, '', $filename);
         $filename = preg_replace('/[\s-]+/', '-', $filename);