Intra-application DND.
The Motif DND protocol. No longer supported
no protocol.
The complex OLE2 DND protocol (not implemented).
An extension to the Xdnd protocol for unclaimed root window drops.
Wayland DND protocol.
The simple WM_DROPFILES protocol.
The Xdnd protocol.
Used in #GdkDragContext to indicate the protocol according to which DND is done.