[FIX] website_sale_comparison: keep attributes order consistent

Backport of 9298c576

+ adapt for v11

closes odoo/odoo#30305

addons/website_sale_comparison/controllers/main.py

@@ -3,6 +3,7 @@ from odoo import http, _
 from odoo.http import request
 from odoo.addons.website_sale.controllers.main import WebsiteSale
 import json
+from collections import OrderedDict
 
 
 class WebsiteSaleProductComparison(WebsiteSale):
@@ -19,12 +20,12 @@ class WebsiteSaleProductComparison(WebsiteSale):
 
         res = {}
         for num, product in enumerate(products):
-            for var in product.attribute_line_ids:
+            for var in product.attribute_line_ids.sorted(lambda x: x.attribute_id.sequence):
                 cat_name = var.attribute_id.category_id.name or _('Uncategorized')
                 att_name = var.attribute_id.name
                 if not product.attribute_value_ids: # create_variant = False
                     continue
-                res.setdefault(cat_name, {}).setdefault(att_name, [' - '] * len(products))
+                res.setdefault(cat_name, OrderedDict()).setdefault(att_name, [' - '] * len(products))
                 val = product.attribute_value_ids.filtered(lambda x: x.attribute_id == var.attribute_id)
                 res[cat_name][att_name][num] = val[0].name
         values['specs'] = res

addons/website_sale_comparison/models/website_sale_comparison.py

@@ -26,6 +26,6 @@ class ProductTemplate(models.Model):
 
     def get_variant_groups(self):
         res = OrderedDict()
-        for var in self.attribute_line_ids:
+        for var in self.attribute_line_ids.sorted(lambda x: x.attribute_id.sequence):
             res.setdefault(var.attribute_id.category_id.name or _('Uncategorized'), []).append(var)
         return res