XmClipboardWithdrawFormat(3) on Linux
The text 91dc6d9d4a3c, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A clipboard function that indicates that the application no longer wants to supply a data item "XmClipboardWithdrawFormat" "clipboard functions" "XmClipboardWithdrawFormat"