Merge pull request tgstation#14450 from AnturK/mechboots

Fixes mechs using occupant spacemove

code/game/atoms_movable.dm

@@ -295,3 +295,23 @@
 	if(buckled_mob == mover)
 		return 1
 	return ..()
+
+
+/atom/movable/proc/get_spacemove_backup()
+	var/atom/movable/dense_object_backup
+	for(var/A in orange(1, get_turf(src)))
+		if(isarea(A))
+			continue
+		else if(isturf(A))
+			var/turf/turf = A
+			if(!turf.density)
+				continue
+			return turf
+		else
+			var/atom/movable/AM = A
+			if(!AM.CanPass(src) || AM.density)
+				if(AM.anchored)
+					return AM
+				dense_object_backup = AM
+				break
+	. = dense_object_backup

code/game/mecha/mecha.dm

@@ -406,9 +406,17 @@
 		events.fireEvent("onMove",get_turf(src))
 
 /obj/mecha/Process_Spacemove(var/movement_dir = 0)
-	if(occupant)
-		return occupant.Process_Spacemove(movement_dir) //We'll just say you used the clamp to grab the wall
-	return ..()
+	. = ..()
+	if(.)
+		return 1
+
+	var/atom/movable/backup = get_spacemove_backup()
+	if(backup)
+		if(istype(backup) && movement_dir && !!backup.anchored)
+			if(backup.newtonian_move(turn(movement_dir, 180)))
+				if(occupant)
+					occupant << "<span class='info'>You push off of [backup] to propel yourself.</span>"
+		return 1
 
 /obj/mecha/relaymove(mob/user,direction)
 	if(!direction)

code/modules/mob/mob_movement.dm

@@ -305,43 +305,40 @@
 ///For moving in space
 ///Return 1 for movement 0 for none
 /mob/Process_Spacemove(movement_dir = 0)
-
 	if(..())
 		return 1
+	var/atom/movable/backup = get_spacemove_backup()
+	if(backup)
+		if(istype(backup) && movement_dir && !backup.anchored)
+			if(backup.newtonian_move(turn(movement_dir, 180))) //You're pushing off something movable, so it moves
+				src << "<span class='info'>You push off of [backup] to propel yourself.</span>"
+		return 1
+	return 0
 
+/mob/get_spacemove_backup()
 	var/atom/movable/dense_object_backup
-	for(var/atom/A in orange(1, get_turf(src)))
+	for(var/A in orange(1, get_turf(src)))
 		if(isarea(A))
 			continue
-
 		else if(isturf(A))
 			var/turf/turf = A
 			if(istype(turf,/turf/space))
 				continue
-
 			if(!turf.density && !mob_negates_gravity())
 				continue
-
-			return 1
-
+			return A
 		else
 			var/atom/movable/AM = A
 			if(AM == buckled) //Kind of unnecessary but let's just be sure
 				continue
 			if(!AM.CanPass(src) || AM.density)
 				if(AM.anchored)
-					return 1
+					return AM
 				if(pulling == AM)
 					continue
 				dense_object_backup = AM
-
-	if(movement_dir && dense_object_backup)
-		if(dense_object_backup.newtonian_move(turn(movement_dir, 180))) //You're pushing off something movable, so it moves
-			src << "<span class='info'>You push off of [dense_object_backup] to propel yourself.</span>"
-
-
-		return 1
-	return 0
+				break
+	. = dense_object_backup
 
 /mob/proc/mob_has_gravity(turf/T)
 	return has_gravity(src, T)