It seems that theme_apply in sub_object_add haven't worked since commit
f6fa1ef612.
scale, theme property will be set properly when the parent is changed.
Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Reviewed-by: Xavi Artigas <xavierartigas@yahoo.es>
Differential Revision: https://phab.enlightenment.org/D8283