Emits the row-has-child-toggled signal on tree_model. This should be called by models after the child state of a node changes.
a [GtkTreePath-struct|GtkTreePath-struct] pointing to the changed row
a valid [GtkTreeIter-struct|GtkTreeIter-struct] pointing to the changed row
Emits the row-has-child-toggled signal on tree_model. This should be called by models after the child state of a node changes.