[MIRROR] pull through z-levels and map transits (#7429)

Co-authored-by: Heroman3003 <31296024+Heroman3003@users.noreply.github.com>
Co-authored-by: CHOMPStation2 <chompsation2@gmail.com>

code/game/objects/effects/map_effects/portal.dm

@@ -93,7 +93,7 @@ when portals are shortly lived, or when portals are made to be obvious with spec
 		//	pulled.forceMove(get_turf(counterpart))
 			pulled.forceMove(counterpart.get_focused_turf())
 			L.forceMove(counterpart.get_focused_turf())
-			L.start_pulling(pulled)
+			L.continue_pulling(pulled)
 		else
 			L.forceMove(counterpart.get_focused_turf())
 	else

code/game/turfs/space/space.dm

@@ -137,6 +137,17 @@
 	. = ..()
 
 	if(edge && ticker?.mode && !density) // !density so 'fake' space turfs don't fling ghosts everywhere
+		if(isliving(A))
+			var/mob/living/L = A
+			if(L.pulling)
+				var/atom/movable/pulled = L.pulling
+				L.stop_pulling()
+				A?.touch_map_edge()
+				pulled.forceMove(L.loc)
+				L.continue_pulling(pulled)
+			else
+				A?.touch_map_edge()
+		else
 			A?.touch_map_edge()
 
 /turf/space/proc/Sandbox_Spacemove(atom/movable/A as mob|obj)

code/modules/mob/mob.dm

@@ -621,6 +621,26 @@
 		var/mob/pulled = AM
 		pulled.inertia_dir = 0
 
+// We have pulled something before, so we should be able to safely continue pulling it. This proc is only for portals!
+/mob/proc/continue_pulling(var/atom/movable/AM)
+
+	if ( !AM || src==AM || !isturf(src.loc) )	//if there's no person pulling OR the person is pulling themself OR the object being pulled is inside something: abort!
+		return
+
+	if (AM.anchored)
+		return
+
+	src.pulling = AM
+	AM.pulledby = src
+
+	if(pullin)
+		pullin.icon_state = "pull1"
+
+	//Attempted fix for people flying away through space when cuffed and dragged.
+	if(ismob(AM))
+		var/mob/pulled = AM
+		pulled.inertia_dir = 0
+
 /mob/proc/can_use_hands()
 	return
 

code/modules/multiz/movement.dm

@@ -134,10 +134,18 @@
 	if(!Move(destination))
 		return 0
 	if(isliving(src))
+		var/list/atom/movable/pulling = list()
+		var/mob/living/L = src
+		if(L.pulling && !L.pulling.anchored)
+			pulling |= L.pulling
+		for(var/obj/item/weapon/grab/G in list(L.l_hand, L.r_hand))
+			pulling |= G.affecting
 		if(direction == UP)
 			src.audible_message("<span class='notice'>[src] moves up.</span>")
 		else if(direction == DOWN)
 			src.audible_message("<span class='notice'>[src] moves down.</span>")
+		for(var/atom/movable/P in pulling)
+			P.forceMove(destination)
 	return 1
 
 /mob/proc/can_overcome_gravity()