Merge pull request #14250 from xjose93/SPELL_AURA_USE_NORMAL_MOVEMENT_SPEED

Core/Unit: Fix snare/daze immunities versus SPELL_AURA_USE_NORMAL_MOVEMENT_SPEED

Fix SPELL_AURA_USE_NORMAL_MOVEMENT_SPEED modifying speeds of bosses that are immune to changes of speeds.

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

@@ -12294,6 +12294,13 @@ void Unit::UpdateSpeed(UnitMoveType mtype, bool forced)
             /// @todo possible affect only on MOVE_RUN
             if (int32 normalization = GetMaxPositiveAuraModifier(SPELL_AURA_USE_NORMAL_MOVEMENT_SPEED))
             {
+                if (Creature* creature = ToCreature())
+                {
+                    uint32 immuneMask = creature->GetCreatureTemplate()->MechanicImmuneMask;
+                    if (immuneMask & (1 << MECHANIC_SNARE) || immuneMask & (1 << MECHANIC_DAZE))
+                        break;
+                }
+
                 // Use speed from aura
                 float max_speed = normalization / (IsControlledByPlayer() ? playerBaseMoveSpeed[mtype] : baseMoveSpeed[mtype]);
                 if (speed > max_speed)