Core/Unit: remove duplicate resist roll in Unit::MeleeSpellHitResult (#17520)

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

@@ -2277,38 +2277,20 @@ SpellMissInfo Unit::MeleeSpellHitResult(Unit* victim, SpellInfo const* spellInfo
     if (roll < tmp)
         return SPELL_MISS_MISS;
 
-    // Chance resist mechanic (select max value from every mechanic spell effect)
-    int32 resist_mech = 0;
-    // Get effects mechanic and chance
-    for (uint8 eff = 0; eff < MAX_SPELL_EFFECTS; ++eff)
-    {
-        int32 effect_mech = spellInfo->GetEffectMechanic(eff);
-        if (effect_mech)
-        {
-            int32 temp = victim->GetTotalAuraModifierByMiscValue(SPELL_AURA_MOD_MECHANIC_RESISTANCE, effect_mech);
-            if (resist_mech < temp * 100)
-                resist_mech = temp * 100;
-        }
-    }
-    // Roll chance
-    tmp += resist_mech;
-    if (roll < tmp)
-        return SPELL_MISS_RESIST;
-
-    bool canDodge = true;
-    bool canParry = true;
-    bool canBlock = spellInfo->HasAttribute(SPELL_ATTR3_BLOCKABLE_SPELL);
-
-    // Same spells cannot be parry/dodge
-    if (spellInfo->HasAttribute(SPELL_ATTR0_IMPOSSIBLE_DODGE_PARRY_BLOCK))
-        return SPELL_MISS_NONE;
-
     // Chance resist mechanic
     int32 resist_chance = victim->GetMechanicResistChance(spellInfo) * 100;
     tmp += resist_chance;
     if (roll < tmp)
         return SPELL_MISS_RESIST;
 
+    // Same spells cannot be parried/dodged
+    if (spellInfo->HasAttribute(SPELL_ATTR0_IMPOSSIBLE_DODGE_PARRY_BLOCK))
+        return SPELL_MISS_NONE;
+
+    bool canDodge = true;
+    bool canParry = true;
+    bool canBlock = spellInfo->HasAttribute(SPELL_ATTR3_BLOCKABLE_SPELL);
+
     // Ranged attacks can only miss, resist and deflect
     if (attType == RANGED_ATTACK)
     {