pub const CLUSTER_LIST_KEY: &str = "\u{1}clustlist";Expand description
Root graph or cluster attribute set by a layout whose GD_clust list is not the
subgraph tree: the subgraph indices of the list, in order and with repeats,
separated by spaces. dot’s pack branch (copyClusterInfo) builds the root’s
list in component order and appends a cluster once per component that kept it;
emit_clusters draws the list as it is.