Set modifications of model attributes only if the item received from the...

Set modifications of model attributes only if the item received from the rosterHandler has different options

converse.js

@@ -1414,9 +1414,13 @@
                 if (!model) {
                     this.addRosterItem(item.jid, item.subscription, item.ask, item.name);
                 } else {
+                    // only modify model attributes if they are different from the
+                    // ones that were already set when the rosterItem was added
+                    if (model.get('subscription') !== item.subscription || model.get('ask') !== item.ask) {
                         model.set({'subscription': item.subscription, 'ask': item.ask});
                     }
                 }
+            }
         },
 
         presenceHandler: function (presence) {