GtkTreeModelFilter does not visit children

[Henrique Ferreiro <henrique ferreiro gmail com>]

Hi all!

I have a problem with GtkTreeModelFilter. I have two combo boxes and one
tree model. Each combo has to present data with an opposite condition. To do
that I share the same tree model (list store) with two tree model filters
which have a visible function with the corresponding condition.
The problem is that, while one of the combo boxes appears to work ok, the
other does not show children nodes.
I have used gdb with a breakpoint at the visible function and it is only
called with the first-level nodes for that combo.
This is the relevant code:

void
f_widget_account_new_set_parent_model (FWidgetAccountNew *f_widget,
                                       GtkTreeModel *parent_model)
{
  ...
  filter_model = gtk_tree_model_filter_new (parent_model, NULL);
  gtk_tree_model_filter_set_visible_func (filter_model,
                                          _account_is_container,
                                          &f_widget->update_code,
                                          NULL);
  ...
  gtk_combo_box_set_model (parent_box, filter_model);
  g_object_unref (filter_model);
  ...
}

static boolean
_account_is_container (GtkTreeModel *treemodel,
                       GtkTreeIter *iter,
                       gpointer data)
{
  gint type;

  gtk_tree_model_get (treemodel, iter,
                      ACCOUNT_TYPE_COL, &type,
                      -1)
  return type == TYPE_ACCOUNT_FOLDER;
}

void
f_widget_account_new_set_transfer_model (FWidgetAccountNew *f_widget,
                                         GtkTreeModel *transfer_model)
{
  ...
  gtk_tree_model_filter_set_visible_func (filter_model,
                                          _account_is_real,
                                          &f_widget->update_code,
                                          NULL);
  ...
}

static boolean
_account_is_real (GtkTreeModel *treemodel,
                  GtkTreeIter *iter,
                  gpointer data)
{
  gint type;

  gtk_tree_model_get (treemodel, iter,
                      ACCOUNT_TYPE_COL, &type,
                      -1);
  return type != TYPE_ACCOUNT_FOLDER;
}

Both set_xxx_model functions are called with the same GtkListStore and only
the first one works.

-- 
Henrique