Fix zero width spaces in diffs

inc/html.php

@@ -1560,7 +1560,7 @@ function html_softbreak_callback($match){
 
     // its a long string without a breaking character,
     // make certain characters into breaking characters by inserting a
-    // breaking character (zero length space, U+200B / #8203) in front them.
+    // word break opportunity (<wbr> tag) in front of them.
     $regex = <<< REGEX
 (?(?=                                 # start a conditional expression with a positive look ahead ...
 &\#?\\w{1,6};)                        # ... for html entities - we don't want to split them (ok to catch some invalid combinations)
@@ -1570,7 +1570,7 @@ function html_softbreak_callback($match){
 )+                                    # end conditional expression
 REGEX;
 
-    return preg_replace('<'.$regex.'>xu','\0&#8203;',$match[0]);
+    return preg_replace('<'.$regex.'>xu','\0<wbr>',$match[0]);
 }
 
 /**