Animate a navigator by having it walk on a path on the graph
l_navigator_walk_backward(navigator, to = "")navigator handle
node name that is part of the active path backward where the navigator should stop.
Note that navigators have the states animationPause and
animationProportionIncrement to control the animation speed.
Further, you can stop the animation when clicking somewhere on the graph
display or by using the mouse scroll wheel.
l_navigator_add