Ticket #11573: 11573.patch

wp-includes/formatting.php

@@ -2841 +2841 @@
         }
 
         $match = array();
+        $found = false;
         while ( preg_match('/%[a-f0-9]{2}/i', $filtered, $match) ) {
                 $filtered = str_replace($match[0], '', $filtered);
+                $found = true;
         }
-        // Strip out the whitespace that may now exist after removing the octets.
-        $filtered = trim( preg_replace('/[\r\n\t ]+/', ' ', $filtered) );
 
+        if ( $found ) {
+                // Strip out the whitespace that may now exist after removing the octets.
+                $filtered = trim( preg_replace('/ +/', ' ', $filtered) );
+        }
+
         return apply_filters('sanitize_text_field', $filtered, $str);
 }