Core/Spells: moved handling of SPELL_ATTR0_CU_DONT_BREAK_STEALTH inside proc system.

Fixes additional issues with spells that shouldn't be breaking stealth and had this attribute

src/server/game/Spells/Auras/SpellAuraEffects.cpp

@@ -1085,15 +1085,12 @@ bool AuraEffect::CheckEffectProc(AuraApplication* aurApp, ProcEventInfo& eventIn
                 return false;
 
             // Spell own damage at apply won't break CC
-            if (SpellInfo const* spellInfo = eventInfo.GetSpellInfo())
+            if (spellInfo && spellInfo == GetSpellInfo())
             {
-                if (spellInfo == GetSpellInfo())
-                {
-                    Aura* aura = GetBase();
-                    // called from spellcast, should not have ticked yet
-                    if (aura->GetDuration() == aura->GetMaxDuration())
-                        return false;
-                }
+                Aura* aura = GetBase();
+                // called from spellcast, should not have ticked yet
+                if (aura->GetDuration() == aura->GetMaxDuration())
+                    return false;
             }
             break;
         }

src/server/game/Spells/Auras/SpellAuras.cpp

@@ -1756,6 +1756,14 @@ uint8 Aura::IsProcTriggeredOnEvent(AuraApplication* aurApp, ProcEventInfo& event
     if (!sSpellMgr->CanSpellTriggerProcOnEvent(*procEntry, eventInfo))
         return 0;
 
+    // check don't break stealth attr present
+    if (m_spellInfo->HasAura(SPELL_AURA_MOD_STEALTH))
+    {
+        if (SpellInfo const* spellInfo = eventInfo.GetSpellInfo())
+            if (spellInfo->HasAttribute(SPELL_ATTR0_CU_DONT_BREAK_STEALTH))
+                return 0;
+    }
+
     // check if aura can proc when spell is triggered (exception for hunter auto shot & wands)
     if (!(procEntry->AttributesMask & PROC_ATTR_TRIGGERED_CAN_PROC) && !(eventInfo.GetTypeMask() & AUTO_ATTACK_PROC_FLAG_MASK))
         if (Spell const* spell = eventInfo.GetProcSpell())

src/server/game/Spells/Spell.cpp

@@ -2580,12 +2580,7 @@ SpellMissInfo Spell::DoSpellHitOnUnit(Unit* unit, uint32 effectMask, bool scaleA
             return SPELL_MISS_EVADE;
 
         if (m_caster->_IsValidAttackTarget(unit, m_spellInfo))
-        {
             unit->RemoveAurasWithInterruptFlags(AURA_INTERRUPT_FLAG_HITBYSPELL);
-
-            if (!m_spellInfo->HasAttribute(SPELL_ATTR0_CU_DONT_BREAK_STEALTH))
-                unit->RemoveAurasByType(SPELL_AURA_MOD_STEALTH);
-        }
         else if (m_caster->IsFriendlyTo(unit))
         {
             // for delayed spells ignore negative spells (after duel end) for friendly targets