During a DND operation, the actions are offered to potential
drop targets. If @actions include %GDK_ACTION_MOVE, you need
to listen to the [signal@Gtk.DragSource::drag-end] signal and
handle @delete_data being %TRUE.
This function can be called before a drag is started,
or in a handler for the [signal@Gtk.DragSource::prepare] signal.
Sets the actions on the GtkDragSource.
During a DND operation, the actions are offered to potential drop targets. If @actions include %GDK_ACTION_MOVE, you need to listen to the [signal@Gtk.DragSource::drag-end] signal and handle @delete_data being %TRUE.
This function can be called before a drag is started, or in a handler for the [signal@Gtk.DragSource::prepare] signal.