TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID

The GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID can be used to make a #GtkTreeSortable use no sorting.

See also gtk_tree_sortable_set_sort_column_id()

enum TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID = -2;

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