No appeal as to any ruling or decision in a mandamus or quo warranto proceeding or in a case involving a writ of prohibition may be taken until there has been a final judgment in the trial court. The grant of a new trial shall be treated as a final judgment in these cases and subject to review as in other cases. History. Ga. L. 1882-83, p. 103, § 3; Civil Code 1895, § 4874; Civil Code 1910, § 5447; Code 1933, § 64-110; Ga. L. 1946, p. 726, § 1; Ga. L. 2016, p. 865, § 3-4/HB 927.