I wonder if it might be something like
* xs/GtkTreeModel.xs (gtk2perl_tree_model_rows_reordered_marshal):
Call gtk_tree_model_iter_n_children before building the stack, in
case
it's a Perl class and calls out to ITER_N_CHILDREN. This fixes
clobbering of instance and treepath args to a Perl rows-reordered
handler connected on a Perl model.
* t/GtkTreeModelIface.t: Exercise rows-reordered marshalling.
<
reordered
.pl
>
<
customlist
.pl
.reorder
.diff><GtkTreeModel.xs.reorder.diff><GtkTreeModelIface.t.reorder.diff>