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06-16-13, 11:15 PM   #6
Malsomnus
A Cobalt Mageweaver
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Join Date: Apr 2013
Posts: 203
Judging by the feature's description, I'd guess that INSTANCE_GROUP_SIZE_CHANGED would fire when the amount of people inside the actual raid instance changes out of combat.
I doubt it will change anything for GROUP_ROSTER_UPDATE, which fires not only when people join/ leave the group but also on role changes and group changes and probably a few other things I forget.
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