Effect of subsequent conveyance, etc., on will

No conveyance or other act made or done subsequently to the execution of a will of or relating to any real or personal estate therein comprised, except an act by which such will is revoked in accordance with section 18 of this Act, shall prevent the operation of the will with respect to such estate or interest in such real or personal estate as the testator has power to dispose of by will at the time of his death.