In the event the decree of the court validates the bonds and no appeal is taken within the time prescribed in § 15.2-2656, or if an appeal is taken and the decree of the court is affirmed, the decree shall be forever binding and conclusive as to the validity of the bonds, the validity of the tax or other means provided for the payment of the bonds, and the validity of all pledges of revenues and of all covenants and provisions contained in any ordinance, resolution, trust agreement, indenture, or other instrument authorizing or providing for the issuance of the bonds, the legality of proceedings taken in connection with the issuance of the bonds, and all matters adjudicated and all objections presented or which might have been presented in the proceeding, and shall constitute a permanent injunction against the institution by any person of any action or proceeding contesting the validity of the bonds or any other matter adjudicated or which might have been called in question in such proceedings.