MinecraftForge/MinecraftForge — pull request #967 by M3gaFr3ak (2014-02-12 18:59:29+00:00)
Title: Fix Hash of ContainerKey

ItemStacks don't have a persistant HashCode, so I made it use the ItemDamage and the hashCode of the Item (which is static)

fixes this:
https://github.com/MinecraftForge/MinecraftForge/issues/962