AI: Fix creature interaction with spell cast and melee flee flag

Author: killerwife

src/game/AI/BaseAI/CreatureAI.cpp

@@ -56,12 +56,6 @@ void CreatureAI::Reset()
 void CreatureAI::EnterCombat(Unit* enemy)
 {
     UnitAI::EnterCombat(enemy);
-    // TODO: Monitor this condition to see if it conflicts with any pets
-    if (m_creature->GetSettings().HasFlag(CreatureStaticFlags::NO_MELEE_FLEE) && !m_creature->IsRooted() && !m_creature->IsInPanic() && !m_creature->IsNonMeleeSpellCasted(false) && enemy && enemy->IsPlayerControlled())
-    {
-        DoFlee(30000);
-        SetAIOrder(ORDER_CRITTER_FLEE); // mark as critter flee for custom handling
-    }
     if (enemy && (m_creature->IsGuard() || m_creature->IsCivilian()))
     {
         // Send Zone Under Attack message to the LocalDefense and WorldDefense Channels

src/game/Entities/Unit.cpp

@@ -8330,6 +8330,13 @@ void Unit::SetInCombatState(bool PvP, Unit* enemy)
         if (creature->AI())
             creature->AI()->EnterCombat(enemy);
 
+        // can be overriden by spellcast on Aggro hook, hence must be done after EnterCombat hook
+        if (!creature->GetCreatedBySpellId() && creature->GetSettings().HasFlag(CreatureStaticFlags::NO_MELEE_FLEE) && !creature->IsRooted() && !creature->IsInPanic() && !creature->IsNonMeleeSpellCasted(false) && enemy && enemy->IsPlayerControlled())
+        {
+            creature->AI()->DoFlee(30000);
+            creature->AI()->SetAIOrder(ORDER_CRITTER_FLEE); // mark as critter flee for custom handling
+        }
+
         // Some bosses are set into combat with zone
         if (GetMap()->IsDungeon() && (creature->GetCreatureInfo()->ExtraFlags & CREATURE_EXTRA_FLAG_AGGRO_ZONE) && enemy && enemy->IsControlledByPlayer())
             creature->SetInCombatWithZone();