Say what you will about the viewports vs. workspaces issue-- i know we need
only one, i'm fine with that.

But how do I have this functionality: 
I used to have 2x2 viewports of one workspace. When I dragged a window down
past the bottom of the screen, it would go to the next space down.

Now, it goes in the order:
0   1
2   3

So if i drag it down from 0 it goes right, if i drag it down from one it
goes  left and down, and if drag it down from 2 it goes right again.  If
I'm at 3 and I drag up, it goes left.

I do not think like an array. Please don't make me.