GtkWidget *dest = get_widget_assert (xml, "split-file-grouping-vars");
GtkWidget *selector = get_widget_assert (xml, "split-file-selector");
GtkWidget *source = get_widget_assert (xml, "split-file-dict-treeview");
GtkWidget *dest = get_widget_assert (xml, "split-file-grouping-vars");
GtkWidget *selector = get_widget_assert (xml, "split-file-selector");
GtkWidget *source = get_widget_assert (xml, "split-file-dict-treeview");