[FIX] web: list view did not discard properly

To add a record to a list, the list controller called the
addDefaultRecord method.  But that method did not made the changes to
the _changes key, it edited in place the data key.

So, this means that it was not possible to discard the add a line.

1 files changed, 3 insertions, 2 deletions

diff --git a/addons/web/static/src/js/views/basic/basic_model.js b/addons/web/static/src/js/views/basic/basic_model.js
index e105b78a836..f93635618e3 100644
--- a/addons/web/static/src/js/views/basic/basic_model.js
+++ b/addons/web/static/src/js/views/basic/basic_model.js
@@ -167,10 +167,11 @@ var BasicModel = AbstractModel.extend({
         };
         return this._makeDefaultRecord(list.model, params).then(function (id) {
             list.count++;
+            list._changes = list.data.slice(0);
             if (position === 'top') {
-                list.data.unshift(id);
+                list._changes.unshift(id);
             } else {
-                list.data.push(id);
+                list._changes.push(id);
             }
             return id;
         });