[8690] added unit auraFlag variable

this can be used for faster checking if an unit has a specific
aura applied..
also implemented the alive-invisible auras now with this way

src/game/SpellAuras.cpp

@@ -2467,6 +2467,16 @@ void Aura::HandleAuraDummy(bool apply, bool Real)
                             m_target->PlayDirectSound(14972, (Player *)m_target);
                     }
                     return;
+                case 10848:
+                case 36978:
+                case 40131:
+                case 27978:
+                case 33900:
+                    if (apply)
+                        m_target->m_AuraFlags |= UNIT_AURAFLAG_ALIVE_INVISIBLE;
+                    else
+                        m_target->m_AuraFlags |= ~UNIT_AURAFLAG_ALIVE_INVISIBLE;
+                    return;
             }
             break;
         }

src/game/Unit.cpp

@@ -104,6 +104,7 @@ Unit::Unit()
     //m_AurasCheck = 2000;
     //m_removeAuraTimer = 4;
     m_AurasUpdateIterator = m_Auras.end();
+    m_AuraFlags = 0;
 
     m_Visibility = VISIBILITY_ON;
 
@@ -10627,9 +10628,7 @@ bool Unit::isVisibleForInState( Player const* u, WorldObject const* viewPoint, b
 /// returns true if creature can't be seen by alive units
 bool Unit::isInvisibleForAlive() const
 {
-    // TODO:  more generic check for those auras
-    // TODO: maybe we also don't need an isAlive() check for visibilty.. but only those auras
-    if (HasAura(10848) || HasAura(36978) || HasAura(40131) || HasAura(27978) || HasAura(33900))
+    if (m_AuraFlags & UNIT_AURAFLAG_ALIVE_INVISIBLE)
         return true;
     // TODO: maybe spiritservices also have just an aura
     return isSpiritService();

src/game/Unit.h

@@ -469,6 +469,12 @@ enum DamageEffectType
     SELF_DAMAGE             = 5
 };
 
+/// internal used flags for marking special auras - for example some dummy-auras
+enum UnitAuraFlags
+{
+    UNIT_AURAFLAG_ALIVE_INVISIBLE   = 0x1,                  // aura which makes unit invisible for alive
+};
+
 enum UnitVisibility
 {
     VISIBILITY_OFF                = 0,                      // absolute, not detectable, GM-like, can see all other
@@ -1390,6 +1396,8 @@ class MANGOS_DLL_SPEC Unit : public WorldObject
 
         Aura* GetDummyAura(uint32 spell_id) const;
 
+        uint32 m_AuraFlags;
+
         uint32 GetDisplayId() { return GetUInt32Value(UNIT_FIELD_DISPLAYID); }
         void SetDisplayId(uint32 modelId);
         uint32 GetNativeDisplayId() { return GetUInt32Value(UNIT_FIELD_NATIVEDISPLAYID); }

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "8689"
+ #define REVISION_NR "8690"
 #endif // __REVISION_NR_H__