This interface is implemented by any drop target context object.
A DropTargetContext is created whenever the logical cursor associated
with a Drag and Drop operation moves within the visible geometry of a
window associated with a DropTarget.
The drop target context provides the mechanism for a potential receiver
of a drop operation to provide the end user with the appropriate drag
under feedback and to effect the subsequent data transfer, if appropriate.
This method should be called from the
XDropTargetListener::drop()
method if the implementation wishes to accept the drop operation with the specified action.
