[graphviz-interest] regular=true and node overlap

The following graph works, laid out with
fdp -s96 -Tpng -o test.png  test.dot


graph {
graph [overlap="prism"]
subgraph cluster23654 {
"23652" [ label="in cluster" regular="true"]
}
"23648" [ label="LT" pin="true" pos="42.826,37.167!"]
"23650" [ label="RT" pin="true" pos="136.76,37.239!"]
"23651" [ label="RB" pin="true" pos="136.56,115.76!"]
"23458" [ label="LB" pin="true" pos="42.619,115.69!"]
}


without overlapping nodes, which is how I want it.  If I take out
overlap="prism", the mode changes to portho, but it still looks good, no
overlap.

However, if I take out "regular=true" in the cluster node, the cluster and
its contained node overlap the other nodes.

Even if I set pin=true on node 23652 inside the cluster, and give it a
position away from the other nodes, it is moved to be on top of them.

What does regular=true have to do with node overlap?

-- 
Ron Newman

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