This may come as a shock to some, but I've just tagged Devil's Pie 0.23 (tarball here).
tl;dr: don't use this, but if you insist it now works with
The abridged changelog:
- Port to libwnck3 (Christian Persch)
- Add unfullscreen action (Mathias Dalh)
- Remove exec action (deprecated by spawn)
I probably wouldn't have ever released this as I'm generally not maintaining it and tend to push people towards Devil's Pie 2 which funnily enough had a 0.23 release two days ago, but Christian asked nicely and I was waiting on a Yocto build to finish.