A. For those persons who have served at least twenty years as a justice of the supreme court, judge of a court of appeal, or judge of a district court, or any combination thereof, a minimum pension of four hundred dollars per month shall be paid to his unmarried widow from the same sources from which the deceased judge or retired judge was compensated at the time of death or retirement for services rendered as a member of the court on which he served.
B. Notwithstanding any provision herein contained to the contrary, no pension to an unmarried widow of a justice of the supreme court, judge of a court of appeal or judge of a district court shall be reduced by application of the provisions of this Section.