XmCreateCombinationBox2(3) on Linux
The text 1690567c70c4, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
The CombinationBox2 widget creation function "XmCreateCombinationBox2" "creation functions" "XmCreateCombinationBox2"