Basically when you put any two items in your crafting window to repair them you eg: 2 stone picks in the 2x2 crafting window, you get a repaired item that you can take and place in your inventory over and over. When you take the repaired item, it doesn't clear the crafting table, so you can keep taking the repaired item, and you can take back your broken items as well.
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Confirmed. The patch to fix repairing items in 14w05b has inadvertently created an item duplicator. Shift-clicking the repaired item will fill the player's inventory with duplicated items.
Confirmed in SSP: was repairing my stone pick on the first night when it started duplicating. Now I've loads of free picks!
Confirmed for me, noticed when repairing a bow while playing LAN Minecraft with my sis. Thankfully, I didn't press shift! xD
Still experiencing duplication attempting repair - no repair
Confirm Shift fills inventory with unrepaired item (weapon/tool/armour)
Experiencing on survival hard (locked) private server running 14w05b
@Andy Purnell According to the ticket update, the bug has been fixed in code. However, the new snapshot with the updated code has not yet been released, so you are still using the existing snapshot with the bug. You should see the fix when the next snapshot arrives.
Getting this as well. We're getting closer to repair working properly again though! _