Normally right-clicking a stack on an empty storage slot places one item in the slot from the stack and left-clicking places the whole stack, but right-clicking a stack on the Destroy Item (red X) slot on Creative mode, places the whole stack on the slot instead of one.

Steps to reproduce:

1. Enter Creative Mode.

2. Pick up a full stack of an item (64 diamonds for example).

3. Hover the stack over the Destroy Item (red X) slot in the Survival Inventory tab.

4. Press the right mouse button.

What actually happens:

The whole 64 diamonds gets removed.

What is expected to happen:

Only one diamond should gets removed from the stack and the other 63 diamonds should stay in the stack.