sale_order_route: propagate route_id to sale order lines.

This is important when you add lines AFTER sale order confirmation.

sale_order_route/__manifest__.py

@@ -16,7 +16,7 @@ This module has been written by Alexis de Lattre from Akretion
     """,
     'author': 'Akretion',
     'website': 'http://www.akretion.com',
-    'depends': ['sale_stock'],
+    'depends': ['sale_stock', 'base_view_inheritance_extension'],
     'data': ['views/sale_order.xml'],
     'installable': True,
 }

sale_order_route/views/sale_order.xml

@@ -15,6 +15,11 @@
         <field name="partner_shipping_id" position="after">
             <field name="route_id" options="{'no_create_edit': True}"/>
         </field>
+        <!-- propagate route_id to lines: it's important when you add an order line AFTER
+        order confirmation -->
+        <field name="order_line" position="attributes">
+            <attribute name="context" operation="python_dict" key="default_route_id">route_id</attribute>
+        </field>
     </field>
 </record>