Right now, the widhest column spans 23 slots, so the row layout is 1-23-1. In this case, trying to get a bigger central app is not allowed (it does nothing).
The proposed solution is:
If a 23-slot app tries to get bigger, the sibling, 1-slot EMPTY col will be removed, so the former will fit 24 slots. Please note that the latest has to be empty, as otherwise this won't be accepted.
If a 24 or 25-slot app gets smaller, a sibling, empty 1-slot col will be created.
Right now, the widhest column spans 23 slots, so the row layout is 1-23-1. In this case, trying to get a bigger central app is not allowed (it does nothing).
The proposed solution is: