Wait for display to finish when reloading record

(grafted from 9023fdf384db2961e4dea922f5194b09f879834f)

--HG--
branch : 7.0

sao/src/screen.js

@@ -1919,7 +1919,7 @@
                 promises.push(this.group.parent.root_parent.reload());
             }
             return jQuery.when.apply(jQuery, promises).then(() => {
-                this.display();
+                return this.display();
             });
         },
         get_buttons: function() {