first errors with Classic, CURRENCY_DISPLAY_UPDATE, SetMerchantFilter and C_Heirloom doesn't exists

Init.lua

@@ -25,9 +25,6 @@ function ns.OnLoad()
 	MerchantBuyBackItem:ClearAllPoints()
 	MerchantBuyBackItem:SetPoint("BOTTOMRIGHT", -7, 33)
 
-	-- The little class select dropdown show trigget a refresh
-	hooksecurefunc("SetMerchantFilter", function() GVS:GetScript("OnShow")(GVS) end)
-
 	-- Force show when we're loaded on demand and the tab is already selected
 	if MerchantFrame:IsVisible() and MerchantFrame.selectedTab == 1 then
 		GVS:Show()

KnownScanner.lua

@@ -2,11 +2,6 @@
 local myname, ns = ...
 
 
-local function HasHeirloom(id)
-	return C_Heirloom.IsItemHeirloom(id) and C_Heirloom.PlayerHasHeirloom(id)
-end
-
-
 local function IsKnown(link)
 	ns.scantip:SetHyperlink(link)
 	for i=1,ns.scantip:NumLines() do
@@ -20,7 +15,7 @@ ns.knowns = setmetatable({}, {
 		local id = ns.ids[i]
 		if not id then return end
 
-		if HasHeirloom(id) or IsKnown(i) then
+		if IsKnown(i) then
 			t[i] = true
 			return true
 		end

frames/MainFrame.lua

@@ -70,7 +70,6 @@ function ns.NewMainFrame()
 
 		GVS:RegisterEvent("BAG_UPDATE")
 		GVS:RegisterEvent("MERCHANT_UPDATE")
-		GVS:RegisterEvent("CURRENCY_DISPLAY_UPDATE")
 	end)
 	GVS:SetScript("OnHide", GVS.UnregisterAllEvents)
 

frames/MerchantItem.lua

@@ -27,14 +27,7 @@ local function HasAllCommonBarterItems(index)
 end
 
 
-local function IsHeirloom(index)
-	local id = GetMerchantItemID(index)
-	return id and C_Heirloom.IsItemHeirloom(id)
-end
-
-
 local function RequiresConfirmation(index)
-	if IsHeirloom(index) then return true end
 	if not HasAllCommonBarterItems(index) then return true end
 end