Core/Entities: remove grid-wide visibility from setActive and implement another method for it

src/server/game/Entities/Object/Object.cpp

@@ -1193,8 +1193,8 @@ void MovementInfo::OutDebug()
 }
 
 WorldObject::WorldObject(bool isWorldObject) : WorldLocation(), LastUsedScriptID(0),
-m_name(""), m_isActive(false), m_isWorldObject(isWorldObject), m_zoneScript(NULL),
-m_transport(NULL), m_zoneId(0), m_areaId(0), m_staticFloorZ(VMAP_INVALID_HEIGHT), m_currMap(NULL), m_InstanceId(0),
+m_name(""), m_isActive(false), m_isFarVisible(false), m_isWorldObject(isWorldObject), m_zoneScript(nullptr),
+m_transport(nullptr), m_zoneId(0), m_areaId(0), m_staticFloorZ(VMAP_INVALID_HEIGHT), m_currMap(nullptr), m_InstanceId(0),
 m_phaseMask(PHASEMASK_NORMAL), _dbPhase(0), m_notifyflags(0), m_executed_notifies(0),
 m_aiAnimKitId(0), m_movementAnimKitId(0), m_meleeAnimKitId(0)
 {
@@ -1254,6 +1254,14 @@ void WorldObject::setActive(bool on)
     }
 }
 
+void WorldObject::SetFarVisible(bool on)
+{
+    if (GetTypeId() == TYPEID_PLAYER)
+        return;
+
+    m_isFarVisible = on;
+}
+
 void WorldObject::CleanupsBeforeDelete(bool /*finalCleanup*/)
 {
     if (IsInWorld())
@@ -1704,7 +1712,7 @@ float WorldObject::GetGridActivationRange() const
 
 float WorldObject::GetVisibilityRange() const
 {
-    if (isActiveObject() && !ToPlayer())
+    if (IsFarVisible() && !ToPlayer())
         return MAX_VISIBILITY_DISTANCE;
     else
         return GetMap()->GetVisibilityRange();
@@ -1716,7 +1724,7 @@ float WorldObject::GetSightRange(const WorldObject* target) const
     {
         if (ToPlayer())
         {
-            if (target && target->isActiveObject() && !target->ToPlayer())
+            if (target && target->IsFarVisible() && !target->ToPlayer())
                 return MAX_VISIBILITY_DISTANCE;
             else if (ToPlayer()->GetCinematicMgr()->IsOnCinematic())
                 return DEFAULT_VISIBILITY_INSTANCE;