XmTextInsertWcs(3) on Linux
The text 3ee93773c3c3, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A Text function that inserts a wide character string into a Text widget "XmTextInsertWcs" "Text functions" "XmTextInsertWcs"