gml4gtk/data/dot-bug-c1.dot

/* bug: both node "aa" and "4" are inside cluster1 and "aa" should be outside cluster */
digraph "a"
{
 aa;
 bb;
 subgraph cluster1
 {
  4;
  4->aa;
 }
 // node aa is relocated to cluster1
 // node bb is not relocated and in root graph
 aa->bb;
}