Core/Threat: Re-add fixtate system. I am being told Netherspite needs it.

src/server/game/Combat/ThreatManager.cpp

@@ -451,10 +451,36 @@ void ThreatManager::ClearAllThreat()
     while (!_myThreatListEntries.empty());
 }
 
+void ThreatManager::FixtateTarget(Unit* target)
+{
+    if (target)
+    {
+        auto it = _myThreatListEntries.find(target->GetGUID());
+        if (it != _myThreatListEntries.end())
+        {
+            _fixtateRef = it->second;
+            return;
+        }
+    }
+    _fixtateRef = nullptr;
+}
+
+Unit* ThreatManager::GetFixtateTarget() const
+{
+    if (_fixtateRef)
+        return _fixtateRef->GetVictim();
+    else
+        return nullptr;
+}
+
 ThreatReference const* ThreatManager::ReselectVictim()
 {
+    // fixtated target is always preferred
+    if (_fixtateRef && _fixtateRef->IsAvailable())
+        return _fixtateRef;
+
     ThreatReference const* oldVictimRef = _currentVictimRef;
-    if (oldVictimRef && !oldVictimRef->IsAvailable())
+    if (oldVictimRef && oldVictimRef->IsOffline())
         oldVictimRef = nullptr;
     // in 99% of cases - we won't need to actually look at anything beyond the first element
     ThreatReference const* highest = _sortedThreatList.top();
@@ -699,6 +725,8 @@ void ThreatManager::PurgeThreatListRef(ObjectGuid const& guid, bool sendRemove)
 
     if (_currentVictimRef == ref)
         _currentVictimRef = nullptr;
+    if (_fixtateRef == ref)
+        _fixtateRef = nullptr;
 
     _sortedThreatList.erase(ref->_handle);
     if (sendRemove && ref->IsAvailable())

src/server/game/Combat/ThreatManager.h

@@ -160,6 +160,12 @@ class TC_GAME_API ThreatManager
         // Removes all targets from the threat list (will cause evade in UpdateVictim if called)
         void ClearAllThreat();
 
+        // Fixtate on the passed target; this target will always be selected until the fixtate is cleared
+        // (if the target is not in the threat list, does nothing)
+        void FixtateTarget(Unit* target);
+        void ClearFixtate() { FixtateTarget(nullptr); }
+        Unit* GetFixtateTarget() const;
+
         // sends SMSG_THREAT_UPDATE to all nearby clients (used by client to forward threat list info to addons)
         void SendThreatListToClients() const;
 
@@ -204,6 +210,7 @@ class TC_GAME_API ThreatManager
         std::unordered_map<ObjectGuid, ThreatReference*> _myThreatListEntries;
         ThreatReference const* _currentVictimRef;
         ThreatReference const* ReselectVictim();
+        ThreatReference const* _fixtateRef;
 
         ///== OTHERS' THREAT LISTS ==
         void PutThreatenedByMeRef(ObjectGuid const& guid, ThreatReference* ref);

src/server/scripts/Commands/cs_debug.cpp

@@ -885,6 +885,7 @@ public:
                     handler->PSendSysMessage("%s (GUID %u, SpawnID %u) is not engaged, but still has a threat list? Well, here it is:", target->GetName().c_str(), target->GetGUID().GetCounter(), target->GetTypeId() == TYPEID_UNIT ? target->ToCreature()->GetSpawnId() : 0);
 
                 count = 0;
+                Unit* fixtateVictim = mgr.GetFixtateTarget();
                 for (ThreatReference const* ref : mgr.GetSortedThreatList())
                 {
                     Unit* unit = ref->GetVictim();
@@ -901,17 +902,20 @@ public:
                             onlineStr = "";
                     }
                     char const* tauntStr;
-                    switch (ref->GetTauntState())
-                    {
-                        case ThreatReference::TAUNT_STATE_TAUNT:
-                            tauntStr = " [TAUNT]";
-                            break;
-                        case ThreatReference::TAUNT_STATE_DETAUNT:
-                            tauntStr = " [DETAUNT]";
-                            break;
-                        default:
-                            tauntStr = "";
-                    }
+                    if (unit == fixtateVictim)
+                        tauntStr = " [FIXTATE]";
+                    else
+                        switch (ref->GetTauntState())
+                        {
+                            case ThreatReference::TAUNT_STATE_TAUNT:
+                                tauntStr = " [TAUNT]";
+                                break;
+                            case ThreatReference::TAUNT_STATE_DETAUNT:
+                                tauntStr = " [DETAUNT]";
+                                break;
+                            default:
+                                tauntStr = "";
+                        }
                     handler->PSendSysMessage("   %u.   %s   (GUID %u)  - threat %f%s%s", ++count, unit->GetName().c_str(), unit->GetGUID().GetCounter(), ref->GetThreat(), tauntStr, onlineStr);
                 }
                 handler->SendSysMessage("End of threat list.");