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Some of the addons use a simple colour tint on the buttons to show usability etc...
So ...
You introduce 4 colours to highlight the different spells for each stance ( for those that have access to all bars regardless of current stance ). Maybe a 5th to show abilities that work with all stances...
Or...
You have 1 additional color ( green/blue etc ) to highlight which spells are available for the current stance.
Maybe other's will have other possibilities for you.
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