[FIX] stock: package transfer shows related pickings

Use case to reproduce:
- Create a picking with a package
- Go to the source or destination package
- Click on package transfers
-> It displays all the pickings

This happens because the package transfer button calls
the all picking tree view that display them.

This commit use an action instead that will add a domain
on it in order to only display the pickings that used the
selected package.

opw-774013

addons/stock/models/stock_quant.py

@@ -694,6 +694,17 @@ class QuantPackage(models.Model):
                 raise UserError(_('Everything inside a package should be in the same location'))
         return True
 
+    @api.multi
+    def action_view_related_picking(self):
+        """ Returns an action that display the picking related to this
+        package (source or destination).
+        """
+        self.ensure_one()
+        pickings = self.env['stock.picking'].search(['|', ('pack_operation_ids.package_id', '=', self.id), ('pack_operation_ids.result_package_id', '=', self.id)])
+        action = self.env.ref('stock.action_picking_tree_all').read()[0]
+        action['domain'] = [('id', 'in', pickings.ids)]
+        return action
+
     @api.multi
     def unpack(self):
         for package in self:

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_related_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>