Seems like this is a type - compare to the attribute in textbox.jelly

war/src/main/webapp/scripts/hudson-behavior.js

@@ -605,7 +605,7 @@ var hudsonRules = {
         ac.animSpeed = 0;
         ac.useShadow = true;
         ac.autoSnapContainer = true;
-        ac.delimChar = e.getAttribute("autoCompleteDelimiChar");
+        ac.delimChar = e.getAttribute("autoCompleteDelimChar");
         ac.doBeforeExpandContainer = function(textbox,container) {// adjust the width every time we show it
             container.style.width=textbox.clientWidth+"px";
             var Dom = YAHOO.util.Dom;