setdiscovery: use revset for resolving DAG heads in a subset
This was the final use of dagutil in setdiscovery! For reasons I didn't investigate, feeding a set with nullrev into the heads() revset resulted in a bunch of tests failing. Filtering out nullrev from the input set fixes things. Differential Revision: https://phab.mercurial-scm.org/D4324
Please register or sign in to comment