Summary:
There were warnings after adding primitive in the same frame more then once, the check was added to avoid it
@fix
Reviewers: cedric, raster, Hermet
Subscribers: cedric, artem.popov
Differential Revision: https://phab.enlightenment.org/D3090
Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>
Otherwise there would be conflicts in certain circumstances.
This also requires adding const on many existing functions,
and similar work is necessary in Elementary.
@fix