Add lines to item tooltip safely

Adding lines to an item tooltip is rather tricky, especially when you get into recipes and other items that behave odd. The below code snippet allows you to add lines while ensuring they are only added once.

Snippet

local lineAdded = false
local function OnTooltipSetItem(tooltip, ...)
   if not lineAdded then
      tooltip:AddLine("Hello World!")
      lineAdded = true
   end
end

local function OnTooltipCleared(tooltip, ...)
   lineAdded = false
end

GameTooltip:HookScript("OnTooltipSetItem", OnTooltipSetItem)
GameTooltip:HookScript("OnTooltipCleared", OnTooltipCleared)

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