[IMP] web_editor: scroll to new element of we-list

This commit improves the ListUserValueWidget to scoll to the new element
when the user adds a new element.

task-2601533

closes odoo/odoo#81241

Signed-off-by: Vray Benjamin (bvr) <bvr@odoo.com>

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -2249,6 +2249,9 @@ const ListUserValueWidget = UserValueWidget.extend({
         }
         this._addItemToTable(undefined, this.el.dataset.defaultValue, recordData);
         this._notifyCurrentState();
+        // Scroll to the new list element.
+        this.el.querySelector('tr:last-child')
+            .scrollIntoView({behavior: 'smooth', block: 'nearest'});
     },
     /**
      * @private