Call display after show all widgets of dialof one2many to set states correctly

tryton/gui/window/view_form/view/form_gtk/one2many.py

@@ -83,8 +83,8 @@ class Dialog(object):
         viewport.add(self.screen.widget)
         width, height = self.screen.screen_container.size_get()
         viewport.set_size_request(width, height + 30)
-        self.screen.display()
         self.dia.show_all()
+        self.screen.display()
 
     def new(self):
         model = self.screen.new(context=self.default_get_ctx)