semantics of move command
Can you elaborate on the semantics of the "move" commands? it is not entirely clear to me how the movement relate to the tree structure.
I figured out that move left/right will either replace the container with its sibling, or get absorbed into the sibling, depending on the split mode of the sibling (is that correct?)
But I am really confused as to what move up/down do, as far as the tree structure is concerned.