XmClipboardEndCopy(3) on Linux
The text a499b3b1a34b, 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 completes the copying of data to the clipboard "XmClipboardEndCopy" "clipboard functions" "XmClipboardEndCopy"