[svn] Remove isVisible function. Check stealth and invisible in canAttack();

Use new remove aura by interrupt flag function.

--HG--
branch : trunk

src/game/GuardAI.cpp

@@ -43,7 +43,7 @@ void GuardAI::MoveInLineOfSight(Unit *u)
     if ( !i_creature.canFly() && i_creature.GetDistanceZ(u) > CREATURE_Z_ATTACK_RANGE )
         return;
 
-    if( !i_creature.getVictim() && u->isTargetableForAttack() &&
+    if( !i_creature.getVictim() && i_creature.canAttack(u) &&
         ( u->IsHostileToPlayers() || i_creature.IsHostileTo(u) /*|| u->getVictim() && i_creature.IsFriendlyTo(u->getVictim())*/ ) &&
         u->isInAccessablePlaceFor(&i_creature))
     {