Returns %TRUE if @iter is an ancestor of @descendant. That is, @iter is the parent (or grandparent or great-grandparent) of @descendant.
A valid #GtkTreeIter
Return: %TRUE, if @iter is an ancestor of @descendant
See Implementation
Returns %TRUE if @iter is an ancestor of @descendant. That is, @iter is the parent (or grandparent or great-grandparent) of @descendant.