Currently user ask for the root_node from the evas_vg object and then attach its tree by setting the root node as parent.
With this change this process will be explicit. user has to set the root node to the evas_vg object and the object will take the ownership
of the tree. User can query the current vg_tree by root_node_get api.
Fixed the test app to reflects this change.
Reviewers: jpeg, cedric
Reviewed By: jpeg, cedric
Differential Revision: https://phab.enlightenment.org/D5347
Signed-off-by: Cedric Bail <email@example.com>