Once this Court has rendered its decision on a post-conviction appeal, that decision shall constitute a final order and the petitioner's state remedies will be deemed exhausted on all issues raised in the petition in error, brief and any prior appeals. A petition for rehearing is not allowed and these issues may not be raised in any subsequent proceeding in a court of this State. The Clerk of this Court shall return to the movant any petitions for rehearing tendered for filing. See Section 1086 of Title 22.