bb

gvFreeLayout and bb attribute

gvFreeLayout apparently doesn't clear completely the root Agraph_t*, since I get multiple 'boxes' (actually invisible, given resulting colors).
I do call gvFreeLayout between successive gvLayout,gvRender. I think could be a problem in libxdot. Here is the result of operation sequence

first call:
0xa0b540 _draw_ c 7 -#ffffff C 7 -#ffffff P 4 0 0 0 198 234 198 234 0
...

second call:
0xa0b540 _draw_ c 7 -#ffffff C 7 -#ffffff P 4 0 0 0 108 198 108 198 0 c 7 -#ffffff C 7 -#ffffff P 4 0 0 0 198 234 198 234 0
...

third call:

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