Return Screen's display promise when creating a new one [PREVIEW] (#291)

* Revert "Fetch missing key definition in Record.set_on_change [PREVIEW] (#274)"

This reverts commit 494a6d3.

* Return Screen's display promise when creating a new one [PREVIEW]

Returning this promise ensure the correct scheduling of the promises
when a wizard contains an x2M widgets that will create a new Sao.Model
which will receive later its fields definition while the on_change will
trigger the process to set the record's values.

---------

Co-authored-by: Jean Cavallo <jean.cavallo@hotmail.fr>

Author: nicoe

sao/src/screen.js

@@ -1619,10 +1619,9 @@
                     if (previous_view.view_type == 'calendar') {
                         previous_view.set_default_date(record, selected_date);
                     }
-                    this.display().done(() => {
+                    return this.display().done(() => {
                         this.set_cursor(true, true);
                     });
-                    return record;
                 });
             });
         },

sao/src/wizard.js

@@ -38,7 +38,7 @@
             this.context.active_ids = this.ids;
             this.context.active_model = this.model;
             this.context.action_id = this.action_id;
-            return Sao.rpc({
+            Sao.rpc({
                 'method': 'wizard.' + this.action + '.create',
                 'params': [this.session.context]
             }, this.session).then(result => {