XmDropSiteUpdate(3) on Linux
The text dc5295400417, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A Drag and Drop function that sets resource values for a drop site "XmDropSiteUpdate" "Drag and Drop functions" "XmDropSiteUpdate"