void gtk_drag_cancel ( GdkDragContext* context )
Cancels an ongoing drag operation on the source side.
If you want to be able to cancel a drag operation in this way,
you need to keep a pointer to the drag context, either from an
explicit call to gtk_drag_begin_with_coordinates(), or by
context does not refer to an ongoing drag operation, this
function does nothing.
If a drag is cancelled in this way, the
result argument of
GtkWidget::drag-failed is set to
|The data is owned by the caller of the function.|