> This function is slow. Only use it for debugging and/or testing > purposes.
Checks if the given iter is a valid iter for this #GtkTreeModelSort.
A #GtkTreeIter.
%TRUE if the iter is valid, %FALSE if the iter is invalid.
2.2
See Implementation
> This function is slow. Only use it for debugging and/or testing > purposes.
Checks if the given iter is a valid iter for this #GtkTreeModelSort.