*sel_copy = gtk_selection_data_copy(selection_data);
if (selection_data->length >= 0) *sel_copy = gtk_selection_data_copy(selection_data);
clipboard_contents_received(GtkClipboard     *clipboard,                            GtkSelectionData *selection_data,                            gpointer          data){    GtkSelectionData **sel_copy = NS_STATIC_CAST(GtkSelectionData **, data);    *sel_copy = gtk_selection_data_copy(selection_data);}