[FIX] web: m2o updates its value after reload

Changes the behaviour of many2ones when their value is changed via a form dialog.

Before this commit, when editing a m2o with a form dialog opened by an external button,
the field triggered an onchange with its old value before reloading its widget.
This caused the edition in list views to display outdated information when
saving multiple records.

Now, the reload is executed first, then the onchange occurs so that the value is
the newly updated one.

Part of task 2078807

closes odoo/odoo#37576

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/js/fields/relational_fields.js

@@ -726,8 +726,13 @@ var FieldMany2One = AbstractField.extend({
                     readonly: !self.can_write,
                     on_saved: function (record, changed) {
                         if (changed) {
-                            self._setValue(self.value.data, {forceChange: true}).then(function() {
-                                self.trigger_up('reload', {db_id: self.value.id});
+                            const _setValue = self._setValue.bind(self, self.value.data, {
+                                forceChange: true,
+                            });
+                            self.trigger_up('reload', {
+                                db_id: self.value.id,
+                                onSuccess: _setValue,
+                                onFailure: _setValue,
                             });
                         }
                     },

addons/web/static/src/js/views/basic/basic_controller.js

@@ -705,21 +705,25 @@ var BasicController = AbstractController.extend(FieldManagerMixin, {
      *   re-render (reload the whole form by default)
      * @param {string[]} [ev.data.fieldNames] list of the record's fields to
      *   reload
+     * @param {Function} [ev.data.onSuccess] callback executed after reload is resolved
+     * @param {Function} [ev.data.onFailure] callback executed when reload is rejected
      */
     _onReload: function (ev) {
         ev.stopPropagation(); // prevent other controllers from handling this request
         var data = ev && ev.data || {};
         var handle = data.db_id;
+        var prom;
         if (handle) {
             // reload the relational field given its db_id
-            this.model.reload(handle).then(this._confirmSave.bind(this, handle));
+            prom = this.model.reload(handle).then(this._confirmSave.bind(this, handle));
         } else {
             // no db_id given, so reload the main record
-            this.reload({
+            prom = this.reload({
                 fieldNames: data.fieldNames,
                 keepChanges: data.keepChanges || false,
             });
         }
+        prom.then(ev.data.onSuccess).guardedCatch(ev.data.onFailure);
     },
     /**
      * Resequence records in the given order.