Coming back to this after a while. It would still be good if I could provide a callback for user-defined adjacency. Does https://bitbucket.org/petsc/petsc/pull-requests/690/plex-support-user-defined-adjacencies-via/diff <https://bitbucket.org/petsc/petsc/pull-requests/690/plex-support-user-defined-adjacencies-via/diff> look suitable?Yes. Karl, could you merge?
Now in next. Best regards, Karli
