Warning 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. Since 2.2
A GtkTreeIter.
TRUE if the iter is valid, FALSE if the iter is invalid.
See Implementation
Warning 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. Since 2.2