XmAddToPostFromList(3) on Linux
The text e5055e188d77, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
a RowColumn function that makes a menu accessible from more than one widget "XmAddToPostFromList" "RowColumn functions" "XmAddToPostFromList"