Core: Added handling for RESEARCH_ARTIFACT_COMPLETE

This is a more appropriate event for handling completions than CURRENCY_DISPLAY_UPDATE  - which was presumably the best available solution at the time when the code was written.

Core/EventHandlers.lua

@@ -59,6 +59,7 @@ function EventHandlers:Register()
 	self:RegisterBucketEvent("BAG_UPDATE", 0.5, "OnBagUpdate")
 	self:RegisterEvent("LOOT_READY", "OnEvent")
 	self:RegisterEvent("CURRENCY_DISPLAY_UPDATE", "OnCurrencyUpdate")
+	self:RegisterEvent("RESEARCH_ARTIFACT_COMPLETE", "OnResearchArtifactComplete")
 	self:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED", "OnCombat") -- Used to detect boss kills that we didn't solo
 	self:RegisterEvent("BANKFRAME_OPENED", "OnEvent")
 	self:RegisterEvent("BANKFRAME_CLOSED", "OnEvent")
@@ -233,9 +234,6 @@ end
 function R:OnCurrencyUpdate(event)
 	self:Debug("Currency updated (" .. event .. ")")
 
-	-- Check if any archaeology projects were solved
-	self:ScanArchFragments(event)
-
 	-- Check if any coins were used
 	for k, v in pairs(self.coins) do
 		local currency = GetCurrencyInfo(k)
@@ -1108,6 +1106,10 @@ function R:OnBagUpdate()
 	R:ProcessInventoryItems()
 end
 
+function R:OnResearchArtifactComplete(event, _)
+	self:ScanArchFragments(event)
+end
+
 --[[
       OBTAIN DETECTION ---------------------------------------------------------------------------------------------------------
       -- Some easy, some fairly arcane methods to detect when we've obtained something we're looking for