[IMP] web: make addNew return the newly created record

used in product configurator logic

X-original-commit: 40cfbf35985422a9415e6ab225d037f7393d3842
Part-of: odoo/odoo#101352
Co-authored-by: Samuel Degueldre <sad@odoo.com>

addons/web/static/src/views/basic_relational_model.js

@@ -977,10 +977,11 @@ export class StaticList extends DataPoint {
         await this.model.__bm__.save(this.__bm_handle__, { savePoint: true });
         this.model.__bm__.freezeOrder(this.__bm_handle__);
         await this.__syncParent(operation);
+        const newRecord = this.records[position === "bottom" ? this.records.length - 1 : 0];
         if (params.mode === "edit") {
-            const newRecord = this.records[position === "bottom" ? this.records.length - 1 : 0];
             await newRecord.switchMode("edit");
         }
+        return newRecord;
     }
 
     // x2many dialog edition