Window layout - vertical plus horizontal containers
(Been using i3wm for a 18 months now, love it. I've looked at FAQ Move Window within Container).
Let's say I've got 3 windows, (A, B, and C), laid out like this:
-------------
| | | |
| A | B | C |
| | | |
-------------
I want to change the layout to the following, how do I do it?
------------
| | B |
| A |---|
| | C |
------------
I know from user guide that the windows are in a tree, I'm trying to work out the key combinations to do the above.