XmTextFieldGetSubstringWcs(3) on Linux
The text 09f16d093586, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A TextField function that retrieves a portion of a wide character internal text buffer "XmTextFieldGetSubstring\%Wcs" "TextField functions" "XmTextFieldGetSubstring\%Wcs"