add_graph fails when passed a GraphViz object

[nerab]

require "graphviz"

# ok
master = GraphViz::new(:G)
cl1 = master.add_graph('cluster_cl1')
puts master.inspect
# digraph G {
# subgraph cluster_cl1 {
# }
# }

# add_graph fails when passed a GraphViz object
master = GraphViz::new(:G)
cl1 = GraphViz::new('cluster_cl1')
master.add_graph cl1
puts master.inspect
# digraph G {
# digraph cluster_cl1 {
# }
# }

I believe that the output of the two parts should be equivalent, i.e. cluster_cl1 should be subgraph instead of digraph.

[glejeune]

Corrected in 1.0.7

[nerab]

Excellent work, thanks for the quick fix!