Add expand on tree view

and unify layout of form view.

issue8644
review262131002

view/product_location_tree.xml

@@ -2,7 +2,7 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <tree>
-    <field name="product"/>
-    <field name="warehouse"/>
-    <field name="location"/>
+    <field name="product" expand="2"/>
+    <field name="warehouse" expand="1"/>
+    <field name="location" expand="1"/>
 </tree>