From 649fc7f9b3b631d94c6286ef09df9ac2808b5d75 Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Thu, 11 Aug 2022 08:43:37 +0300
Subject: [PATCH] Monsters "remember" noteleport levels

... using the same hack when zapping themselves: If the level is
no-teleport, the monster will learn of teleport traps, and if
it knows about them, won't try using teleportation again.
---
 src/muse.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/muse.c b/src/muse.c
index 49ac4940d..61674e19d 100644
--- a/src/muse.c
+++ b/src/muse.c
@@ -1289,6 +1289,9 @@ find_offensive(struct monst* mtmp)
         if (obj->otyp == WAN_TELEPORTATION && obj->spe > 0
             /* don't give controlled hero a free teleport */
             && !Teleport_control
+            /* same hack as MUSE_WAN_TELEPORTATION_SELF */
+            && (!noteleport_level(mtmp)
+                || !(mtmp->mtrapseen & (1 << (TELEP_TRAP - 1))))
             /* do try to move hero to a more vulnerable spot */
             && (onscary(u.ux, u.uy, mtmp)
                 || (stairway_at(u.ux, u.uy)))) {