[FIX] web: Many2one: wait for name_create before saving

The problem occurred in form views with a many2one field, when the
user reproduced the following steps:
 - type some text in the many2one
 - click on 'Create ...' in the many2one dropdown to quick create
   (name_create RPC) the record
 - before the name_create returns, click on 'Save'.

When this happened, the record was saved before the many2one was
updated with its new value. So the record was incorrectly saved,
and the view was again dirty as soon as the name_create returned,
even if it was in 'readonly'. So after saving, a 'Changes will be
discarded' dialog opened when the user tried to leave the form.

We fix this issue by making the controller wait for the name_create
to return, and for the many2one to update its value, before saving.

This issue could also occur in list views.

1 files changed, 6 insertions, 2 deletions

diff --git a/addons/web/static/src/js/views/basic/basic_controller.js b/addons/web/static/src/js/views/basic/basic_controller.js
index 53e5be8ff6e..4f6cf5e2ebb 100644
--- a/addons/web/static/src/js/views/basic/basic_controller.js
+++ b/addons/web/static/src/js/views/basic/basic_controller.js
@@ -186,8 +186,12 @@ var BasicController = AbstractController.extend(FieldManagerMixin, {
         // user if some discarding has to be made). This operation must also be
         // mutex-protected as commitChanges function of x2m has to be aware of
         // all final changes made to a row.
-        this.mutex.exec(this.renderer.commitChanges.bind(this.renderer, recordID || this.handle)); // TODO write a test for this
-        return this.mutex.exec(this._saveRecord.bind(this, recordID, options));
+        var self = this;
+        return this.mutex
+            .exec(this.renderer.commitChanges.bind(this.renderer, recordID || this.handle))
+            .then(function () {
+                return self.mutex.exec(self._saveRecord.bind(self, recordID, options));
+            });
     },
     /**
      * @override