"Put in current pack" is displayed for delivery order for state == done

When the state of a delivery order (stock.picking.out) is set to "done" by delivering it, items that are not in packs still show the button "Put in current pack" which is probably not intended.

In the stock/stock_view.xml both "attrs" and "states" are used to set invisibility in the record with id "view_move_picking_tree":
<button name="setlast_tracking" string="Put in current pack" type="object"
                        attrs="{'invisible': [('tracking_id','&lt;&gt;',False)]}"
                        icon="terp-accessories-archiver"
                        groups="stock.group_tracking_lot"
                        states="draft,assigned,confirmed"/>

As described in https://bugs.launchpad.net/openobject-client/+bug/941901 this does not work as one wants. The fix for this case would be to set "attrs" to
"{'invisible': ['|', ('tracking_id','!=',False), ('state', 'not in', ['draft','assigned','confirmed'])]}"
and remove the "states". At least, this works for me.

This also applies in a similar way to the records with ids
view_move_tree
view_move_tree_reception_picking

Both 7.0 and trunk are affected.