Installing packages that depend on libjack.so.0 with updates-testing enabled now no longer causes Carla to be installed instead of jack-audio-connection-kit, so the issue should be fixed. Koji still lists libjack.so.0 as one of the "Provides" of the Carla package though, but I'm not sure if that is an issue.
BZ#1663357 Carla claims to provide libjack.so.0 but doesn't
This update has been submitted for testing by martinkg.
This update has been pushed to testing.
Installing packages that depend on libjack.so.0 with updates-testing enabled now no longer causes Carla to be installed instead of jack-audio-connection-kit, so the issue should be fixed. Koji still lists libjack.so.0 as one of the "Provides" of the Carla package though, but I'm not sure if that is an issue.
This update has been obsoleted by Carla-2.0.0-0.7.20181225git2f3a442.fc29.