XmImUnsetFocus(3) on Linux
The text 018ef8d4f504, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
An input manager function that notifies an input method that a widget has lost input focus "XmImUnsetFocus" "input manager functions" "XmImUnsetFocus"