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Maul, using Mind Control/Dominate Mind and the alike also counts as possess.
According to those tests, the buttons on the actual actionbar were still 133+, though the two buttons that replaces the stancebar are the actual buttons that is counted as the possess buttons by the blizzard ui.
So, question in my head was this: Why have two elements for 1 bar?
Easy enough, the StanceBar handles anything "default", anything that is considered part of a class, like druid forms, warrior stances, shadowform etc, while the possessbar handles anything else (mostly exit buttons from a possessive state).
So what we need [possess] or something alike it for is just to know when to swap the buttons replaced on the main menu bar securely. Anything non-secure can be detected with UPDATE_POSSESS_BAR and IsPossessBarVisible().
You can quote me on that for the post on the US forums, as I can't post there myself.
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