Fix Advanced Item Description error popup problems (#8311)

* show as warning, once per session

* move to keypress handling code

src/Classes/Item.lua

@@ -298,10 +298,6 @@ function ItemClass:ParseRaw(raw, rarity, highQuality)
 	self.rawLines = { }
 	-- Find non-blank lines and trim whitespace
 	for line in raw:gmatch("%s*([^\n]*%S)") do
-		if line:match("^{ ") then
-			main:OpenMessagePopup("Error", "\"Advanced Item Description\" (Ctrl+Alt+c) is currently unsupported.\nPlease try again using Ctrl+c only.")
-			return
-		end
 		t_insert(self.rawLines, line)
 	end
 	local mode = rarity and "GAME" or "WIKI"

src/Classes/ItemsTab.lua

@@ -1170,6 +1170,11 @@ function ItemsTabClass:Draw(viewPort, inputEvents)
 		if event.type == "KeyDown" then	
 			if event.key == "v" and IsKeyDown("CTRL") then
 				local newItem = Paste()
+				if newItem:find("{ ", 0, true) then
+					main:OpenConfirmPopup("Warning", "\"Advanced Item Descriptions\" (Ctrl+Alt+c) are unsupported.\n\nAbort paste?", "OK", function()
+						self:SetDisplayItem()
+					end)
+				end
 				if newItem then
 					self:CreateDisplayItemFromRaw(newItem, true)
 				end