Java Version: 1.8.0_111 64 bit
Please see the attached file.
In the file, STATE1 has an edge to its parent group "PARENT", but you can't see it unless you look in the Neighborhood view. You can also only select it from the Neighborhood view.
To create an example edge, start dragging from STATE2 to edge of PARENT and drop it. The edge will "dissapear", but will be there.
I know that some auto layouts will re-arrange the edge so that you can see it, but the diagrams I'm working on are large and already hand arranged (nodes & edges).
Most of these edges are left behind by accident because they "dissapeared".
Any suggestions? Is there a setting to prevent this?