Merge branch 'master' of https://github.com/Citadel-Station-13/Citadel-Station-13 into auxtools-atmos

code/modules/mapping/space_management/multiz_helpers.dm

@@ -13,13 +13,15 @@
 	var/offset
 	while((offset = SSmapping.level_trait(other_z, ZTRAIT_DOWN)))
 		other_z += offset
+		if(other_z in .)
+			break	// no infinite loops
 		. += other_z
 	other_z = center_z
 	while((offset = SSmapping.level_trait(other_z, ZTRAIT_UP)))
 		other_z += offset
+		if(other_z in .)
+			break	// no infinite loops
 		. += other_z
-	return .
-
 
 /proc/get_dir_multiz(turf/us, turf/them)
 	us = get_turf(us)
@@ -46,4 +48,4 @@
 
 /turf/proc/below()
 	return get_step_multiz(src, DOWN)
-	
+