Not always from the creative inventory taken at the clamped Shift stack items

Not always from the creative inventory taken at the clamped Shift stack items

Steps to Reproduce:
1. Open creative inventory
2. While holding Shift try to take a stack of items
3. Stack is not always taken. Sometimes taken while holding the Shift when you press 2 times the left mouse button on the item. Or try to take stack with another Shift.