&amp; should be reversed last (to correctly transform "&amp;lt;" to "&lt;" and not to "<")

js/twister_formatpost.js

@@ -342,10 +342,10 @@ function escapeHtmlEntities(str) {
 
 function reverseHtmlEntities(str) {
     return str
-                .replace(/&/g, '&')
                 .replace(/&lt;/g, '<')
                 .replace(/&gt;/g, '>')
                 .replace(/&quot;/g, '"')
-                .replace(/&apos;/g, "'");
+                .replace(/&apos;/g, "'")
+                .replace(/&amp;/g, '&');
 }