Creature/AI: Fix incorrect evade logic (closes #16461)

src/server/game/Entities/Creature/Creature.cpp

@@ -2142,6 +2142,11 @@ bool Creature::CanCreatureAttack(Unit const* victim, bool /*force*/) const
     if (GetMap()->IsDungeon())
         return true;
 
+    // if the mob is actively being damaged, do not reset due to distance unless it's a world boss
+    if (!isWorldBoss())
+        if (time(NULL) - GetLastDamagedTime() <= MAX_AGGRO_RESET_TIME)
+            return true;
+
     //Use AttackDistance in distance check if threat radius is lower. This prevents creature bounce in and out of combat every update tick.
     float dist = std::max(GetAttackDistance(victim), sWorld->getFloatConfig(CONFIG_THREAT_RADIUS)) + m_CombatDistance;
 

src/server/game/Entities/Unit/Unit.cpp

@@ -12750,7 +12750,7 @@ Unit* Creature::SelectVictim()
         }
     }
     else
-        return NULL;
+        return nullptr;
 
     if (target && _IsTargetAcceptable(target) && CanCreatureAttack(target))
     {
@@ -12759,14 +12759,6 @@ Unit* Creature::SelectVictim()
         return target;
     }
 
-    // Case where mob is being kited.
-    // Mob may not be in range to attack or may have dropped target. In any case,
-    //  don't evade if damage received within the last 10 seconds
-    // Does not apply to world bosses to prevent kiting to cities
-    if (!isWorldBoss() && !GetInstanceId())
-        if (time(NULL) - GetLastDamagedTime() <= MAX_AGGRO_RESET_TIME)
-            return target;
-
     // last case when creature must not go to evade mode:
     // it in combat but attacker not make any damage and not enter to aggro radius to have record in threat list
     // for example at owner command to pet attack some far away creature
@@ -12775,12 +12767,12 @@ Unit* Creature::SelectVictim()
     {
         if ((*itr) && !CanCreatureAttack(*itr) && (*itr)->GetTypeId() != TYPEID_PLAYER
         && !(*itr)->ToCreature()->HasUnitTypeMask(UNIT_MASK_CONTROLABLE_GUARDIAN))
-            return NULL;
+            return nullptr;
     }
 
     /// @todo a vehicle may eat some mob, so mob should not evade
     if (GetVehicle())
-        return NULL;
+        return nullptr;
 
     // search nearby enemy before enter evade mode
     if (HasReactState(REACT_AGGRESSIVE))
@@ -12798,17 +12790,17 @@ Unit* Creature::SelectVictim()
         {
             if ((*itr)->GetBase()->IsPermanent())
             {
-                AI()->EnterEvadeMode();
+                AI()->EnterEvadeMode(CreatureAI::EVADE_REASON_OTHER);
                 break;
             }
         }
-        return NULL;
+        return nullptr;
     }
 
     // enter in evade mode in other case
     AI()->EnterEvadeMode(CreatureAI::EVADE_REASON_NO_HOSTILES);
 
-    return NULL;
+    return nullptr;
 }
 
 //======================================================================