InlineWordLevelDiff regex should be /xsu - FS#2142

inc/DifferenceEngine.php

@@ -932,7 +932,7 @@ class InlineWordLevelDiff extends MappedDiff {
     }
 
     function _split($lines) {
-        if (!preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xs',
+        if (!preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xsu',
              implode("\n", $lines), $m)) {
             return array(array(''), array(''));
         }