Affects Version/s: Minecraft 15w37a
Fix Version/s: None
Environment:Windows 7 Home Premium 64-Bit & Java SE 1.8.0_60-b27
How to reproduce this bug:
1. Put an Item in the shield-slot and take one item in your right hand
2. open your inventory and use a number on the keyboard to place another item directly in your currently selected slot
3. Press the F Key to switch the items between your hands
=> now you have duplicated the item you had in your right hand before step 2
This bug seems to work only in creative mode.
I hope you understand my description!
Greetings from germany