If you would still like vivid to have the cherry-picked upstream fix, without introducing other changes in the new 1.3.12 release, I have uploaded the changes to lp:~e7appew/ubuntu/vivid/deluge/fix-set-trackers-cherry-picked.
If you would still like vivid to have the cherry-picked upstream fix, without introducing other changes in the new 1.3.12 release, I have uploaded the changes to lp:~e7appew/ubuntu/vivid/deluge/fix-set-trackers-cherry-picked.