Item moves slightly in slot after being quick moved to anvil

Discovered while testing MCPE-179679.

Item moves slightly in slot after being quick moved to anvil. This usually happens in the second slot, however for some items this could happen in first slot as well.

Steps to Reproduce:

1. Place down an anvil, and open it's GUI.

2. Quick move some item from your inventory.

3. Take a look closely at the item.

Observed Results:
Item moves slightly in slot after being quick moved to anvil.

Expected Results:
Item would not move in slot after being quick moved to anvil.