Hello,
I'm trying to draw hierarchy from a NestedBlockState made like this

<NestedBlockState object, with base <BlockState object with 2263 blocks (91 
nonempty), degree-corrected, for graph <Graph object, directed, with 8272 
vertices and 52548 edges, 1 internal vertex property, at 0x128d14110>, at 
0x13ffa8f10>, and 10 levels of sizes [(8272, 91), (91, 34), (34, 10), (10, 3), 
(3, 2), (2, 1), (1, 1), (1, 1), (1, 1), (1, 1)] at 0x128cca590>

when I run 

state.draw(output='foo.pdf')

I obtain a picture with colored nodes on the outer circle, the hierarchy path 
but no bezier curves for edges. I've tried to draw only levels > 0 (so 91 nodes 
here) and it works like in graph_tool documentation examples. In order to draw 
edges I had to use gt.graph_draw passing edge_control_points (from 
gt.get_hierarchy_control_points). Is there some threshold in gt.draw_hierarchy 
that sets edge visibility if over/under a certain number of blocks?
graph_tool 2.30 here

Thanks
d
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