fix(Core/Spells): Fix movement impairment auras not being removed (#19684)

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

@@ -5185,17 +5185,12 @@ void Unit::RemoveMovementImpairingAuras(bool withRoot)
     for (AuraApplicationMap::iterator iter = m_appliedAuras.begin(); iter != m_appliedAuras.end();)
     {
         Aura const* aura = iter->second->GetBase();
-        if (aura->GetSpellInfo()->Mechanic == MECHANIC_SNARE)
+        if (aura->GetSpellInfo()->Mechanic == MECHANIC_SNARE || aura->GetSpellInfo()->HasEffectMechanic(MECHANIC_SNARE))
         {
             RemoveAura(iter);
             continue;
         }
 
-        // Xinef: turn off snare auras by setting amount to 0 :)
-        for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)
-            if (((1 << i) & iter->second->GetEffectMask()) && aura->GetSpellInfo()->Effects[i].Mechanic == MECHANIC_SNARE)
-                aura->GetEffect(i)->ChangeAmount(0);
-
         ++iter;
     }
 }

src/server/game/Spells/SpellInfo.cpp

@@ -880,6 +880,15 @@ bool SpellInfo::HasEffect(SpellEffects effect) const
     return false;
 }
 
+bool SpellInfo::HasEffectMechanic(Mechanics mechanic) const
+{
+    for (auto const& effect : Effects)
+        if (effect.Mechanic == mechanic)
+            return true;
+
+    return false;
+}
+
 bool SpellInfo::HasAura(AuraType aura) const
 {
     for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)

src/server/game/Spells/SpellInfo.h

@@ -407,6 +407,7 @@ public:
 
     uint32 GetCategory() const;
     bool HasEffect(SpellEffects effect) const;
+    bool HasEffectMechanic(Mechanics mechanic) const;
     bool HasAura(AuraType aura) const;
     bool HasAnyAura() const;
     bool HasAreaAuraEffect() const;