XmListSetItem(3) on Linux
The text a5ca16ae15e2, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A List function that makes an existing item the first visible item in the list "XmListSetItem" "List functions" "XmListSetItem"