Core/Spell: reimplemented TRIGGERED_DISALLOW_PROC_EVENTS trigger flag

Triggered spells shouldn't chain-trigger other spells

Closes #18217

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

@@ -10730,6 +10730,11 @@ void Unit::TriggerAurasProcOnEvent(Unit* actionTarget, uint32 typeMaskActor, uin
 
 void Unit::TriggerAurasProcOnEvent(ProcEventInfo& eventInfo, AuraApplicationProcContainer& aurasTriggeringProc)
 {
+    Spell const* triggeringSpell = eventInfo.GetProcSpell();
+    bool const disableProcs = triggeringSpell && triggeringSpell->IsProcDisabled();
+    if (disableProcs)
+        SetCantProc(true);
+
     for (auto const& aurAppProc : aurasTriggeringProc)
     {
         AuraApplication* aurApp;
@@ -10748,6 +10753,9 @@ void Unit::TriggerAurasProcOnEvent(ProcEventInfo& eventInfo, AuraApplicationProc
         if (spellInfo->HasAttribute(SPELL_ATTR3_DISABLE_PROC))
             SetCantProc(false);
     }
+
+    if (disableProcs)
+        SetCantProc(false);
 }
 
 SpellSchoolMask Unit::GetMeleeDamageSchoolMask() const

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

@@ -450,7 +450,7 @@ enum TriggerCastFlags
     TRIGGERED_IGNORE_SET_FACING                     = 0x00000200,   //! Will not adjust facing to target (if any)
     TRIGGERED_IGNORE_SHAPESHIFT                     = 0x00000400,   //! Will ignore shapeshift checks
     TRIGGERED_IGNORE_CASTER_AURASTATE               = 0x00000800,   //! Will ignore caster aura states including combat requirements and death state
-    // reuse                                        = 0x00001000,
+    TRIGGERED_DISALLOW_PROC_EVENTS                  = 0x00001000,   //! Disallows proc events from triggered spell (default)
     TRIGGERED_IGNORE_CASTER_MOUNTED_OR_ON_VEHICLE   = 0x00002000,   //! Will ignore mounted/on vehicle restrictions
     // reuse                                        = 0x00004000,
     // reuse                                        = 0x00008000,

src/server/game/Spells/Spell.h

@@ -494,6 +494,7 @@ class TC_GAME_API Spell
         void ReSetTimer() { m_timer = m_casttime > 0 ? m_casttime : 0; }
         bool IsTriggered() const { return (_triggeredCastFlags & TRIGGERED_FULL_MASK) != 0; }
         bool IsIgnoringCooldowns() const { return (_triggeredCastFlags & TRIGGERED_IGNORE_SPELL_AND_CATEGORY_CD) != 0; }
+        bool IsProcDisabled() const { return (_triggeredCastFlags & TRIGGERED_DISALLOW_PROC_EVENTS) != 0; }
         bool IsChannelActive() const { return m_caster->GetUInt32Value(UNIT_CHANNEL_SPELL) != 0; }
         bool IsAutoActionResetSpell() const;