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When igraph_is_forest() determined that a graph is not a directed forest, and the roots output parameter was set to NULL, it would incorrectly cache that the graph is also not an undirected forest.
igraph_spanner() now correctly ignores edge directions, and no longer crashes on directed graphs.
Deprecated
igraph_are_connected() is renamed to igraph_are_adjacent(); the old name is kept available until at least igraph 1.0.