Re: reordering top-level items in a tree

[John Finlay <finlay moeraki com>]

Nathan Fredrickson wrote:

> Hi,
> I'm trying to reorder items in a GtkTreeStore using
> gtk_tree_store_swap().  This works fine if the items being reordered are
> on a sub-level of the tree, but is fails when reordering top-level
> items.
>
> (test:7491): Gtk-CRITICAL **: file gtktreemodel.c: line 626
> (gtk_tree_path_compare): assertion `a->depth > 0' failed
>
> Looking at the source of gtk_tree_store_swap(), I see that parents of
> both items are found in order to determine if both items belong to the
> same level.  Top-level items do not have a parent so it fails.
>
> The manual says nothing about this function not working on top level
> items.  And if this function can't do it, then how can top-level items
> be reordered?
>
> Here is a small test program demonstrating the behavior:
> http://worksintheory.org/files/misc/tree-swap.c
>
>  
See bug #139785 for a patch to fix this.

John