Bukkit/CraftBukkit — pull request #781 by 7H3LaughingMan (2012-05-26 07:18:38+00:00)
Title: Fix for BUKKIT-1704

If it is trying to create an net.minecraft.server.ItemStack out of a org.bukkit.inventory.ItemStack that is already a org.bukkit.craftbukkit.inventory.CraftItemStack it will make a copy of the CraftItemStack and return that handle.