Don't set default value for on_change and set id

issue3487

src/common.js

@@ -316,6 +316,7 @@
             var change_with = this.attributes.selection_change_with || [];
             var key = [];
             var args = record._get_on_change_args(change_with);
+            delete args.id;
             for (var k in args) {
                 key.push([k, args[k]]);
             }

src/model.js

@@ -685,6 +685,7 @@
                 });
                 result[arg] = scope;
             });
+            result.id = this.id;
             return result;
         },
         on_change: function(fieldname, attr) {