*Prevent possible problems with application of negative auras with 0 duration, now only spell hits which were diminished are immuned.

*Remove old code of SPELL_AURA_MOD_AOE_DAMAGE_AVOIDANCE forgotten in c84e55b632.

--HG--
branch : trunk

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

@@ -12710,10 +12710,10 @@ void Unit::IncrDiminishing(DiminishingGroup group)
     m_Diminishing.push_back(DiminishingReturn(group,getMSTime(),DIMINISHING_LEVEL_2));
 }
 
-void Unit::ApplyDiminishingToDuration(DiminishingGroup group, int32 &duration,Unit* caster,DiminishingLevels Level, int32 limitduration)
+float Unit::ApplyDiminishingToDuration(DiminishingGroup group, int32 &duration,Unit* caster,DiminishingLevels Level, int32 limitduration)
 {
     if (duration == -1 || group == DIMINISHING_NONE || caster->IsFriendlyTo(this))
-        return;
+        return 1.0f;
 
     // test pet/charm masters instead pets/charmeds
     Unit const* targetOwner = GetCharmerOrOwner();
@@ -12767,6 +12767,7 @@ void Unit::ApplyDiminishingToDuration(DiminishingGroup group, int32 &duration,Un
     }
 
     duration = int32(duration * mod);
+    return mod;
 }
 
 void Unit::ApplyDiminishingAura(DiminishingGroup group, bool apply)

src/server/game/Entities/Unit/Unit.h

@@ -1106,7 +1106,7 @@ class Unit : public WorldObject
 
         DiminishingLevels GetDiminishing(DiminishingGroup  group);
         void IncrDiminishing(DiminishingGroup group);
-        void ApplyDiminishingToDuration(DiminishingGroup  group, int32 &duration,Unit* caster, DiminishingLevels Level, int32 limitduration);
+        float ApplyDiminishingToDuration(DiminishingGroup  group, int32 &duration,Unit* caster, DiminishingLevels Level, int32 limitduration);
         void ApplyDiminishingAura(DiminishingGroup  group, bool apply);
         void ClearDiminishings() { m_Diminishing.clear(); }