From 072041db06fa78bec0a4d45c7ef473764d89769f Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Thu, 11 Jan 2024 15:23:05 +0100
Subject: [PATCH] savemem:: make sure it is not the same altmap

---
 savemem.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/savemem.cpp b/savemem.cpp
index 08c3ba6f..829ac3dc 100644
--- a/savemem.cpp
+++ b/savemem.cpp
@@ -116,8 +116,12 @@ EX void save_memory() {
       }
     }
   
-  while(celldist(at->c7) > d-LIM) at = at->move(0);
-  
+  while(celldist(at->c7) > d-LIM && at != orig) at = at->move(0);
+
+  // make sure it is not the same altmap
+  auto atalt = at->alt; if(atalt) atalt = atalt->alt;
+  while(atalt && at != orig && at->alt && at->alt->alt == atalt) at = at->move(0);
+
   // go back to such a point X that all the heptagons adjacent to the current 'at'
   // are the children of X. This X becomes the new 'at'
   if(true) {