[IMP] stock: improve detailed transfer performance

Transfers were slowed because of the continuous
computation of pickings remaining quantities.

This revision delay the computation at the end of the transfer,
so the computation is performed only once, and it
therefore leads to a huge performance improvment.

opw-634416

addons/stock/wizard/stock_transfer_details.py

@@ -91,16 +91,15 @@ def do_detailed_transfer(self):
                     'owner_id': prod.owner_id.id,
                 }
                 if prod.packop_id:
-                    prod.packop_id.write(pack_datas)
+                    prod.packop_id.with_context(no_recompute=True).write(pack_datas)
                     processed_ids.append(prod.packop_id.id)
                 else:
                     pack_datas['picking_id'] = self.picking_id.id
                     packop_id = self.env['stock.pack.operation'].create(pack_datas)
                     processed_ids.append(packop_id.id)
         # Delete the others
         packops = self.env['stock.pack.operation'].search(['&', ('picking_id', '=', self.picking_id.id), '!', ('id', 'in', processed_ids)])
-        for packop in packops:
-            packop.unlink()
+        packops.unlink()
 
         # Execute the transfer of the picking
         self.picking_id.do_transfer()