title: Graphviz: make edges not affecting the hierarchy of nodes
body: <p>I add edges (green) to graph, that makes hierarchy of nodes. How to add minor edges (red) that not affecting on the hierarchy?</p>
  
  <p><img src="https://i.stack.imgur.com/97Yd4.png" alt="enter image description here"></p>
  
  <p>Edit: It's Qt graphViz library.</p>