*Fix a bug that mobs do not stop chasing players.

--HG--
branch : trunk

src/game/Unit.cpp

@@ -10448,8 +10448,11 @@ bool Unit::SelectHostilTarget()
     // search nearby enemy before enter evade mode
     if(Unit *target = ((Creature*)this)->SelectNearestTarget())
     {
-        ((Creature*)this)->AI()->AttackStart(target);
-        return true;
+        if(!((Creature*)this)->IsOutOfThreatArea(target))
+        {
+            ((Creature*)this)->AI()->AttackStart(target);
+            return true;
+        }
     }
 
     if(m_invisibilityMask)