Space exposure still shows for natural tiles

Ah naw, don't remove a way of determining where the edge of the world gen backwall is before digging 

Obligatory shout out to XKCD Workflow.

Edited March 17 by myxal

Seconded, natural tile that lacks the safety net of backwall/drywall does have that fun space exposure that lets us plan ahead. I vote for it being a valid notification.

To be fair, hunting for the space exposure status in the info cards does feel like a kludge. It's tolerable with natural blocks, not so much with finished builds (and it was even worse before the fix for airflow/mesh/doors... oh the amount of LH2 I've wasted)

Would be nice to have something dedicated to displaying space exposure. Maybe a "special" filter in the material overlay? Highlight space exposure, void, and maybe neutronium. Unless of course, the player was never meant to know which cells were space-exposed before digging...