[IMP] stock: Only display related pickings on "Package Transfer" button

Purpose
=======
On a stock stock.quant.package form view, the "Package Transfer" button does not have any filter, it opens all the pickings

Clicking on "Package Transfer" button should display its related pickings

addons/stock/models/stock_quant.py

@@ -656,6 +656,12 @@ class QuantPackage(models.Model):
         self.unlink()
         return self.env['ir.actions.act_window'].for_xml_id('stock', 'action_package_view')
 
+    def action_view_picking(self):
+        action = self.env.ref('stock.action_picking_tree_all').read()[0]
+        pickings = self.env['stock.pack.operation'].search([('result_package_id', 'in', self.ids)]).mapped('picking_id')
+        action['domain'] = [('id', 'in', pickings.ids)]
+        return action
+
     @api.multi
     def view_content_package(self):
         action = self.env['ir.actions.act_window'].for_xml_id('stock', 'quantsact')

addons/stock/views/stock_quant_views.xml

@@ -176,8 +176,8 @@
                 </header>
                 <sheet>
                     <div class="oe_button_box" name="button_box">
-                        <button class="oe_stat_button" name="%(action_picking_tree_all)d"
-                        string="Package Transfers" type="action"
+                        <button class="oe_stat_button" name="action_view_picking"
+                        string="Package Transfers" type="object"
                         widget="statinfo" icon="fa-dropbox"/>
                         <button name="get_content_package" type="object" string="View Contained Packages content" icon="fa-cogs" attrs="{'invisible': [('children_ids','=',[])]}"/>
                     </div>