check ->priv->cursor and ->priv->anchor rowrefs before removing

check ->priv->cursor and ->priv->anchor rowrefs before removing

Tue Apr 16 17:28:21 2002  Kristian Rietveld  <kris@gtk.org>

        * gtk/gtktreeview.c (gtk_tree_view_real_collapse_row): check
        ->priv->cursor and ->priv->anchor rowrefs before removing
        node->children from the rbtree. Also check the
        ->priv->last_single_clicked and ->priv->last_single_clicked_2 rowrefs
        (I think I really need to rename those two someday).