> 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.
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.