From a80cb1b44eb481f08424c4a12a7fddda3e3546a3 Mon Sep 17 00:00:00 2001
From: mwerezak <mwerezak@gmail.com>
Date: Wed, 29 Apr 2015 20:27:39 -0400
Subject: [PATCH] Fixes edges being lost when zones are merged

---
 code/ZAS/Zone.dm | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/code/ZAS/Zone.dm b/code/ZAS/Zone.dm
index 7c9c5f32ed2..7bb8afc8c5e 100644
--- a/code/ZAS/Zone.dm
+++ b/code/ZAS/Zone.dm
@@ -105,6 +105,13 @@ Class Procs:
 		#ifdef ZASDBG
 		T.dbg(merged)
 		#endif
+	
+	//rebuild the old zone's edges so that the will be possesed by the new zone
+	for(var/connection_edge/E in edges)
+		if(E.contains_zone(into))
+			continue //don't need to rebuild this edge
+		for(var/turf/T in E.connecting_turfs)
+			air_master.mark_for_update(T)
 
 /zone/proc/c_invalidate()
 	invalid = 1