[1.12] limit server>client ItemStack packet chattiness #4252
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Change to prevent server only itemstack changes triggering SPacketEntityEquipment and SPacketSetSlot from being triggered.
Currently when an itemstack changes in any way it always sends these packets to client even in cases where the change may not have changed the client stack - data in cap nbt or data not included in NBTShareTag.
So this change adds a condition in two places that checks if the client stack has actually changed and only in that case it allows the packets to be sent.
This is 1.12 version of #4045