- Patch #1631164 by Aron Novak, Mithrandir: autocomplete fires on readonly fields.

core/misc/autocomplete.js

@@ -102,7 +102,7 @@ Drupal.jsAC.prototype.onkeyup = function (input, e) {
       return true;
 
     default: // All other keys.
-      if (input.value.length > 0) {
+      if (input.value.length > 0 && !input.readOnly) {
         this.populatePopup();
       }
       else {