In any case heretofore or hereafter arising in which a judge has been judge of a circuit created under § 17.1-506 as amended, and the counties and cities, or one or more of them, have been transferred to and constituted as part of a new judicial circuit and the remaining counties and cities constituted as a circuit, the judges of the respective circuits are hereby declared to be judges of said circuits in which they reside and their actions are hereby ratified, validated and confirmed.