Add track_visibility='onchange' on important fields of picking

Code cleanup

purchase_usability/purchase.py

@@ -9,7 +9,6 @@ from odoo import models, fields, api
 class PurchaseOrder(models.Model):
     _inherit = 'purchase.order'
 
-    state = fields.Selection(track_visibility='onchange')
     picking_type_id = fields.Many2one(track_visibility='onchange')
     dest_address_id = fields.Many2one(track_visibility='onchange')
     currency_id = fields.Many2one(track_visibility='onchange')

stock_usability/stock.py

@@ -21,6 +21,10 @@ class StockPicking(models.Model):
     # In the stock module: _order = "priority desc, date asc, id desc"
     # The problem is date asc
 
+    partner_id = fields.Many2one(track_visibility='onchange')
+    picking_type_id = fields.Many2one(track_visibility='onchange')
+    move_type = fields.Selection(track_visibility='onchange')
+
 
 class StockLocation(models.Model):
     _inherit = 'stock.location'