Fixes the slow leak in arrivals (#25074)

* Fixes the slow leak in arrivals

* ree src

code/game/machinery/doors/airlock.dm

@@ -89,6 +89,8 @@ var/list/airlock_overlays = list()
 	explosion_block = 1
 	hud_possible = list(DIAG_AIRLOCK_HUD)
 
+	var/air_tight = FALSE	//TRUE means density will be set as soon as the door begins to close
+
 /obj/machinery/door/airlock/Initialize()
 	..()
 	wires = new /datum/wires/airlock(src)
@@ -1321,8 +1323,10 @@ var/list/airlock_overlays = list()
 	operating = 1
 	update_icon(AIRLOCK_CLOSING, 1)
 	src.layer = CLOSED_DOOR_LAYER
+	if(air_tight)
+		density = TRUE
 	sleep(5)
-	src.density = 1
+	density = TRUE
 	if(!safe)
 		crush()
 	sleep(9)

code/modules/shuttle/on_move.dm

@@ -29,23 +29,15 @@
 /atom/movable/light/onShuttleMove()
 	return 0
 
-/obj/machinery/door/onShuttleMove()
-	. = ..()
-	if(!.)
-		return
-	INVOKE_ASYNC(src, .proc/close)
-	// Close any attached airlocks as well
-	for(var/obj/machinery/door/D in orange(1, src))
-		INVOKE_ASYNC(src, .proc/close)
-
 /obj/machinery/door/airlock/onShuttleMove()
 	shuttledocked = 0
-	for(var/obj/machinery/door/airlock/A in orange(1, src))
+	for(var/obj/machinery/door/airlock/A in range(1, src))
 		A.shuttledocked = 0
+		A.air_tight = TRUE
 		INVOKE_ASYNC(A, /obj/machinery/door/.proc/close)
 	. = ..()
 	shuttledocked =  1
-	for(var/obj/machinery/door/airlock/A in orange(1, src))
+	for(var/obj/machinery/door/airlock/A in range(1, src))
 		A.shuttledocked = 1
 /mob/onShuttleMove()
 	if(!move_on_shuttle)