[FIX] stock: complete_name of stock location

Have the following location structure: Loc A -> Loc B -> Loc C
The `complete_name` fields are:
- Loc A
- Loc A/Loc B
- Loc A/Loc B/Loc C

When changing Loc A to Loc D, the `complete_name` are:
- Loc D
- Loc D/Loc B
- Loc A/Loc B/Loc C

Compute `complete_name` of stock location using `complete_name` of
parent instead of parsing the full bunch of ancestors.  This improves
the computation speed, and moreover solves the recursivity problem.

Closes #21585

addons/stock/models/stock_location.py

@@ -69,15 +69,13 @@ class Location(models.Model):
     _sql_constraints = [('barcode_company_uniq', 'unique (barcode,company_id)', 'The barcode for a location must be unique per company !')]
 
     @api.one
-    @api.depends('name', 'location_id.name')
+    @api.depends('name', 'location_id.complete_name')
     def _compute_complete_name(self):
         """ Forms complete name of location from parent location to child location. """
-        name = self.name
-        current = self
-        while current.location_id:
-            current = current.location_id
-            name = '%s/%s' % (current.name, name)
-        self.complete_name = name
+        if self.location_id.complete_name:
+            self.complete_name = '%s/%s' % (self.location_id.complete_name, self.name)
+        else:
+            self.complete_name = self.name
 
     @api.multi
     def name_get(self):