Ports automatic material stacking from TG
Created by: 9600bauds
Ports https://github.com/tgstation/-tg-station/pull/10973, full credit to MrPerson. What this PR does is make some stackable items (such as floortiles, cable coils, metal sheets etc) try to stack with eachother when they're in the same tile. This allows you to, for example, drag a floortile behind yourself to scoop up all the loose tiles in a hallway.
Fixes #7649 (closed)
Webm: http://a.pomf.cat/wsvmwc.webm In this .webm you can see:
- How pleb I am by forgetting most hotkeys
- How dumb I am by throwing the full stack back into the pile
- My shit taste in music