From a934080d004255e84c14d265d697f5c206a46307 Mon Sep 17 00:00:00 2001
From: killerwife <killerwife@gmail.com>
Date: Tue, 29 Oct 2024 09:07:20 +0100
Subject: [PATCH] SpawnGroup: Add cyclic graph trigger protection to spawn
 group aggro trigger

---
 src/game/Maps/SpawnGroup.cpp | 7 +++++++
 src/game/Maps/SpawnGroup.h   | 1 +
 2 files changed, 8 insertions(+)

diff --git a/src/game/Maps/SpawnGroup.cpp b/src/game/Maps/SpawnGroup.cpp
index ede19c8f1d..7e0e11467a 100644
--- a/src/game/Maps/SpawnGroup.cpp
+++ b/src/game/Maps/SpawnGroup.cpp
@@ -423,6 +423,11 @@ void CreatureGroup::TriggerLinkingEvent(uint32 event, Unit* target)
             if (!target->HasCharmer() && m_objects.find(target->GetDbGuid()) != m_objects.end())
                 return;
 
+            if (m_linkageTargets.find(target) != m_linkageTargets.end()) // already triggering for target
+                return;
+
+            m_linkageTargets.insert(target);
+
             for (auto& data : m_objects)
             {
                 uint32 dbGuid = data.first;
@@ -441,6 +446,8 @@ void CreatureGroup::TriggerLinkingEvent(uint32 event, Unit* target)
                 CreatureGroup* group = static_cast<CreatureGroup*>(m_map.GetSpawnManager().GetSpawnGroup(linkedGroup));
                 group->TriggerLinkingEvent(event, target);
             }
+
+            m_linkageTargets.erase(target);
             break;
         case CREATURE_GROUP_EVENT_EVADE:
             if ((m_entry.Flags & CREATURE_GROUP_EVADE_TOGETHER) != 0)
diff --git a/src/game/Maps/SpawnGroup.h b/src/game/Maps/SpawnGroup.h
index 4ca81b52f7..ccd3a90aba 100644
--- a/src/game/Maps/SpawnGroup.h
+++ b/src/game/Maps/SpawnGroup.h
@@ -100,6 +100,7 @@ class CreatureGroup : public SpawnGroup
     private:
         void ClearRespawnTimes();
         FormationDataSPtr m_formationData;
+        std::set<Unit*> m_linkageTargets;
 };
 
 struct RespawnPosition