[FIX] product: name_get performances

Currently, product.name_get goes through
each product in the record set
before calling _get_combination_name
on its attribute values.

This can lead to some slowdowns when the recordset
starts to grow (> 100 products). The reason for
that is that _get_combination_name
filters the recordset twice.

This commit speed-up _get_combination_name
by "resetting" prefetch_ids to self._prefetch_ids,
i.e. the prefetch_ids of the whole recordset.

opw-2624261

closes odoo/odoo#83563

X-original-commit: 2065c53a6e0c3f1c363f5b2bea401782a1f4b31b
Signed-off-by: Raphael Collet <rco@odoo.com>

addons/product/models/product_attribute.py

@@ -554,7 +554,9 @@ class ProductTemplateAttributeValue(models.Model):
 
     def _get_combination_name(self):
         """Exclude values from single value lines or from no_variant attributes."""
-        return ", ".join([ptav.name for ptav in self._without_no_variant_attributes()._filter_single_value_lines()])
+        ptavs = self._without_no_variant_attributes().with_prefetch(self._prefetch_ids)
+        ptavs = ptavs._filter_single_value_lines().with_prefetch(self._prefetch_ids)
+        return ", ".join([ptav.name for ptav in ptavs])
 
     def _filter_single_value_lines(self):
         """Return `self` with values from single value lines filtered out