Aha, so the ```posted``` condition is meant to prevent notifications from previewing a draft, right?

What I wanted to understand was what prevented this from notifying after repeated previewing of an already posted work. I'll be happy if someone, anyone, says they tried it manually, if the feature test doesn't cover this particular case.

I even made myself a spreadsheet with the callbacks to understand in which order they might get called :D 
https://docs.google.com/spreadsheet/ccc?key=0ApjdqA6K8JD-dF9jeExlRGJtRG01ckoxRm9PYTdIckE#gid=0