Fix to make engine notification propagate when enabling/disabling outputs. The 13.5.Boolean Mentor example should work now. Done by pederb.
Fix to make engine notification propagate when enabling/disabling
outputs. The 13.5.Boolean Mentor example should work now. Done
by pederb.

Alexpux/Coin3D,Alexpux/Coin3D,Alexpux/Coin3D,Alexpux/Coin3D