Cant craft on mac 1.6.1

Put the summary of the bug you're having here

What I expected to happen was...:
for single blocks to appear in a space when i pressed ctrl on a mac during crafting

What actually happened was...:
the blocks stayed the same, just like left clicking.

Steps to Reproduce:
1. Open up a crafting table
2. try to split a stack of items in half(on a mac)
3. ...