Support column-reverse

[NRaf]

I have a use case when I need to split between two panels, but I'd like the order of the panes to flip around.

Basically, I have a table and a map. When in horizontal mode, I want the table to be on the left (this is currently what I have).

When I switch across to vertical, I want the table to be on the bottom, not top.

I can achieve this using column-reverse, which mostly works, however the dragging becomes inverted. If I drag up, the pane shrinks and vice versa.

.as-vertical {
  flex-direction: column-reverse;
}

It'd be great to have a reverse or similar input that basically does a row-reverse/column-reverse and ensures the dragging works as expected.

[beeman]

Seems like a nice addition, I'm happy to review and merge a PR that adds support for this.

[Harpush]

Can't you do it with order?