XmImMbResetIC(3) on Linux
The text e4b7a3af7c2e, 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 resets the input context for a widget