XmDragContext(3) on Linux
The text baa5f46d2049, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
The DragContext widget class "XmDragContext" "widget class" "DragContext"