When I have a split as such
+++++++++++
| |
+++++++++++
|b |c |
| | |
+++++++++++
Focusing in the a column works as expected, but for this layout
+++++++++++++++++++
| | |
+++++++++++ |
|b | | |
| | | |
+++++++++++++++++++
focusing on b squishes the layout directly beside it, rather than evenly distributing between the one that takes up both rows.