Bug 764517: Don't automatically select the first keyword if the search string is empty

js/field.js

@@ -909,6 +909,9 @@ YAHOO.bugzilla.fieldAutocomplete = {
                 this.expandContainer();
             }
         });
+        fieldAutoComp.dataRequestEvent.subscribe( function(type, args) {
+            args[0].autoHighlight = args[1] != '';
+        });
     }
 };