Vertically inverted tile transitions

[Anyone]

As of 0.17 we have tile transitions for out-of-map, which looks pretty good! However, several communities have underground maps, and it would be really, really nice to have the transition take place north instead of south. Imagine the above image but rotated 180 degrees, which gives it even more of an underground feeling.

[Ranakastrasz]

Took me a bit to figure it out. Yea. Edge of map right now is more void than wall.
Option to invert that? makes sense.