Snapshot 13w01a, Snapshot 13w01b
Osx Mountain Lion v10.8.2, Java v7 Update 10
I was messing around with the new snapshot 13w01a, and I wanted to try the new crafting mechanics. I was making some diamond blocks and turning them back to diamonds.
Then I realized I left that my inventory was really messy with all the diamonds, so before crafting the diamond blocks back to diamonds, I double clicked them to organize my inventory, but then I noticed that I had more diamonds than before, and I had the same number of diamond blocks.
Steps to Reproduce:
1. Craft an item.
2. Leave it in your inventory.
3. Make the crafting recipe in the crafting table.
4. Double click the same item in your inventory
MC-5845 Duplications - ingots/diamonds etc.