[6.1/trunk] Slow product price list

Hey,

Fetching a product list (80) based on a pricelist, it's slow because of the the amount of product categories.

Ex.
- All Product
- Import Supp001 Category
- Import Supp002 Category
- Import Supp003 Category
- Import Supp004 Category
==> with around a total of 2400 categories

in product/pricelist.py
 --> function "price_get_multi" > line 185:

     # product.category:
     product_category_ids = product_category_obj.search(cr, uid, [])
     product_categories = product_category_obj.read(cr, uid, product_category_ids, ['parent_id'])
     product_category_tree = dict([(item['id'], item['parent_id'][0]) for item in product_categories if item['parent_id']])

==> this will always fetch all categories for each product in the list and is used to get the parents categories of the product
         which is used then in "_create_parent_category_list" (line 137) and slow downs the list.

Possible fix is:
 We have then disabled the full search of the categories and rewrite the "_create_parent_category_list" function;
 >>>
 def _create_parent_category_list( categ_id, lst ):
  if not categ_id:
   return []
  category = product_category_obj.browse( cr, uid, categ_id )
  if category.parent_id:
   lst.append( category.parent_id.id )
               return _create_parent_category_list( category.parent_id.id, lst )
  return lst
  # _create_parent_category_list

 maybe not the best solution, but we go from 15sec -> 1.4 sec for fetching the list.

RevNo:
- Addons : 6850
- Web : 2364
- Server : 4212