Interface/AddOns/Blizzard_ActionBar/Camelot/ActionButtonUtilOverrides.lua

+-- We want to only show highlighting on spells that are not on your bar but the highest rank.

+function ActionButtonUtil.OverrideStatusForUnplacedSpell(status, spellID, notOnBar)

+ if notOnBar then

+ -- check if spellID is the highest rank, if it isn't then just give it ActionButtonUtil.ActionBarActionStatus.NotMissing

+ if C_ActionBar.IsHighestSpellRank(spellID) then

+ status = ActionButtonUtil.ActionBarActionStatus.MissingFromAllBars;

+ else

+ status = ActionButtonUtil.ActionBarActionStatus.NotMissing;

+ end

+ end

+ return status;

+end