This is a bug in the lwjgl, Natives etc. You can't move, you can only look around, place blocks, destroy blocks and jump, escape and slash if you hold them for a long
What I thought was going to happen was I would be able move normally
What happened was I could only move in certain ways.
Steps to Reproduce:
1. Open minecraft with a Macbook
2. Move around a little
3. You will experience this bug