Core/Spells:

- rename SpellInfo::IsAOE to SpellInfo::IsTargetingArea due to ambiguity of old name.
- add IsAffectingArea function to check whenever spell or it's effects are affecting objects in area and use new function to fix problems with hunter flares.
Closes #3310. Thanks to Kaelima and Warpten for research.

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

@@ -2412,7 +2412,7 @@ SpellMissInfo Unit::MagicSpellHitResult(Unit* victim, SpellInfo const* spell)
         // Chance hit from victim SPELL_AURA_MOD_ATTACKER_SPELL_HIT_CHANCE auras
         modHitChance += victim->GetTotalAuraModifierByMiscMask(SPELL_AURA_MOD_ATTACKER_SPELL_HIT_CHANCE, schoolMask);
         // Reduce spell hit chance for Area of effect spells from victim SPELL_AURA_MOD_AOE_AVOIDANCE aura
-        if (spell->IsAOE())
+        if (spell->IsTargetingArea())
             modHitChance -= victim->GetTotalAuraModifier(SPELL_AURA_MOD_AOE_AVOIDANCE);
 
         // Decrease hit chance from victim rating bonus
@@ -12081,7 +12081,7 @@ bool Unit::_IsValidAttackTarget(Unit const* target, SpellInfo const* bySpell) co
             return false;
 
     // can't attack invisible (ignore stealth for aoe spells)
-    if ((!bySpell || !(bySpell->AttributesEx6 & SPELL_ATTR6_CAN_TARGET_INVISIBLE)) && !canSeeOrDetect(target, bySpell && bySpell->IsAOE()))
+    if ((!bySpell || !(bySpell->AttributesEx6 & SPELL_ATTR6_CAN_TARGET_INVISIBLE)) && !canSeeOrDetect(target, bySpell && bySpell->IsAffectingArea()))
         return false;
 
     // can't attack dead
@@ -12176,7 +12176,7 @@ bool Unit::_IsValidAssistTarget(Unit const* target, SpellInfo const* bySpell) co
             return false;
 
     // can't assist invisible
-    if ((!bySpell || !(bySpell->AttributesEx6 & SPELL_ATTR6_CAN_TARGET_INVISIBLE)) && !canSeeOrDetect(target, bySpell && bySpell->IsAOE()))
+    if ((!bySpell || !(bySpell->AttributesEx6 & SPELL_ATTR6_CAN_TARGET_INVISIBLE)) && !canSeeOrDetect(target, bySpell && bySpell->IsAffectingArea()))
         return false;
 
     // can't assist dead
@@ -14871,7 +14871,7 @@ uint32 Unit::GetCastingTimeForBonus(SpellInfo const* spellProto, DamageEffectTyp
                 break;
         }
 
-        if (spellProto->Effects[i].IsArea())
+        if (spellProto->Effects[i].IsTargetingArea())
             AreaEffect = true;
     }
 

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

@@ -1855,7 +1855,7 @@ bool Aura::CanStackWith(Aura const* existingAura) const
                 case SPELL_AURA_OBS_MOD_HEALTH:
                 case SPELL_AURA_PERIODIC_TRIGGER_SPELL_WITH_VALUE:
                     // periodic auras which target areas are not allowed to stack this way (replenishment for example)
-                    if (m_spellInfo->Effects[i].IsArea() || existingSpellInfo->Effects[i].IsArea())
+                    if (m_spellInfo->Effects[i].IsTargetingArea() || existingSpellInfo->Effects[i].IsTargetingArea())
                         break;
                     return true;
                 default:

src/server/game/Spells/Spell.cpp

@@ -5401,7 +5401,7 @@ SpellCastResult Spell::CheckCast(bool strict)
             }
             case SPELL_AURA_PERIODIC_MANA_LEECH:
             {
-                if (m_spellInfo->Effects[i].IsArea())
+                if (m_spellInfo->Effects[i].IsTargetingArea())
                     break;
 
                 if (!m_targets.GetUnitTarget())
@@ -6630,7 +6630,7 @@ void Spell::HandleLaunchPhase()
             continue;
 
         // do not consume ammo anymore for Hunter's volley spell
-        if (IsTriggered() && m_spellInfo->SpellFamilyName == SPELLFAMILY_HUNTER && m_spellInfo->IsAOE())
+        if (IsTriggered() && m_spellInfo->SpellFamilyName == SPELLFAMILY_HUNTER && m_spellInfo->IsTargetingArea())
             usesAmmo = false;
 
         if (usesAmmo)
@@ -6681,7 +6681,7 @@ void Spell::DoAllEffectOnLaunchTarget(TargetInfo& targetInfo, float* multiplier)
 
             if (m_damage > 0)
             {
-                if (m_spellInfo->Effects[i].IsArea())
+                if (m_spellInfo->Effects[i].IsTargetingArea())
                 {
                     m_damage = int32(float(m_damage) * unit->GetTotalAuraMultiplierByMiscMask(SPELL_AURA_MOD_AOE_DAMAGE_AVOIDANCE, m_spellInfo->SchoolMask));
                     if (m_caster->GetTypeId() == TYPEID_UNIT)

src/server/game/Spells/SpellInfo.cpp

@@ -503,7 +503,7 @@ bool SpellEffectInfo::IsAura(AuraType aura) const
     return IsAura() && ApplyAuraName == aura;
 }
 
-bool SpellEffectInfo::IsArea() const
+bool SpellEffectInfo::IsTargetingArea() const
 {
     return TargetA.IsArea() || TargetB.IsArea();
 }
@@ -1061,10 +1061,19 @@ bool SpellInfo::IsAbilityOfSkillType(uint32 skillType) const
     return false;
 }
 
-bool SpellInfo::IsAOE() const
+bool SpellInfo::IsAffectingArea() const
 {
     for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)
-        if (Effects[i].IsEffect() && Effects[i].IsArea())
+        if (Effects[i].IsEffect() && (Effects[i].IsTargetingArea() || Effects[i].IsEffect(SPELL_EFFECT_PERSISTENT_AREA_AURA) || Effects[i].IsAreaAuraEffect()))
+            return true;
+    return false;
+}
+
+// checks if spell targets are selected from area, doesn't include spell effects in check (like area wide auras for example)
+bool SpellInfo::IsTargetingArea() const
+{
+    for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)
+        if (Effects[i].IsEffect() && Effects[i].IsTargetingArea())
             return true;
     return false;
 }

src/server/game/Spells/SpellInfo.h

@@ -279,7 +279,7 @@ public:
     bool IsEffect(SpellEffects effectName) const;
     bool IsAura() const;
     bool IsAura(AuraType aura) const;
-    bool IsArea() const;
+    bool IsTargetingArea() const;
     bool IsAreaAuraEffect() const;
     bool IsFarUnitTargetEffect() const;
     bool IsFarDestTargetEffect() const;
@@ -403,7 +403,8 @@ public:
     bool IsAbilityLearnedWithProfession() const;
     bool IsAbilityOfSkillType(uint32 skillType) const;
 
-    bool IsAOE() const;
+    bool IsAffectingArea() const;
+    bool IsTargetingArea() const;
     bool NeedsExplicitUnitTarget() const;
     bool NeedsToBeTriggeredByCaster() const;