Tex. Government Code § 24.949

(a) If a county is removed from a judicial district and placed or left in another judicial district by reapportionment under this subchapter, the district clerk of that county shall, on the effective date of the reapportionment order, transfer and properly docket to the court of a judicial district in which the county is located the cases and proceedings in that county on the docket of the court of the judicial district from which the county is removed, with all records, documents, and instruments on file in connection with the cases and proceedings. If a county is removed from a judicial district and placed or left in more than one judicial district, the clerk shall transfer the cases and proceedings to the district court of the judicial district for that county having the lowest numerical designation.

(b) If cases or other proceedings are transferred from a district court to another district court in accordance with this subchapter, all writs, processes, bonds, bail bonds, recognizances, complaints, informations and indictments, and any other matters returnable to the court from which the cases or proceedings were transferred are returnable to the court to which the cases or proceedings are transferred and are as valid as if they had been made returnable originally to that court.