Nodes stay fixed after initial animation.
    
    There is an animation of nodes layout after first load of graph or adding new node.
    Then all nodes of the graph are set to the fixed state. The node is set to fixed even after
    manual turn off of fixed state.
    
    https://fedorahosted.org/freeipa/ticket/5649
    
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>