[graphviz-interest] A problem with rank = same

Consider the attached x.gv.

I've marked 3 lines a optional, so you can easily put a '#' at the 
start. Actually, it saves me explaining things....

I tried all 8 combinations of those lines activated and commented out, 
and in the 1 case where they are all activated, node_2 is above node_3, 
meaning rank=same is ignored.

In the other 7 cases node_2 is horizontally to the left of node_3, as 
I'd expect.

Is that a bug in Graphviz or have I misunderstood something?

-- 
Ron Savage - savage.net.au

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strict digraph
{
	node_1
	->
	subgraph  // Optional
	cluster   // Optional
	{
		node [shape = square]

		rank = same;

		node_2
		->      // Optional
		node_3
		[
			color    = green
			penwidth = 4
		]
	}
	[
		color    = red
		penwidth = 2
	]
}