Support rank=min/max within the context of a cluster
This issues is migrated from the wishlist HTML page at https://graphviz.org/doc/todo.html.
Git blame shows this is from 2014:
620a8b3427 (Emden R. Gansner 2014-01-30 15:21:11 -0500 101) Support rank=min/max within the context of a cluster.
rank is defined at https://graphviz.org/doc/info/attrs.html#d:rank. It's defined as not working in any of node/cluster/edge/graph though, so I'm a bit confused.