Description of problem: dnf is now using group as object by default and it should be possible to convert the old way where a group was installed, when the mandatory packages was installed into installed group objects. yum does that with yum group mark-convert Version-Release number of selected component (if applicable): 0.4.19
Discussed on IRC. Perhaps we should even do that automatically (perhaps not). Thanks Tim.
The can't see any problems in doing it automatic :)
Group as objects are default in yum from f19 [1]. DNF always treat groups as objects. Now there's a tool which imports group metadata from yum to dnf [2]. [1] https://fedoraproject.org/wiki/Features/YumGroupsAsObjects [2] http://dnf-plugins-extras.readthedocs.org/en/latest/migrate.html