gtk:list-store-iter-is-valid (model iter)

model -- a gtk:list-store object
iter -- a gtk:tree-iter iterator

True if iter is valid, nil if iter is invalid.

Checks if the given iter is a valid iterator for this gtk:list-store. This function is slow. Only use it for debugging and/or testing purposes. The gtk:list-store implementation is deprecated since 4.10. Use the g:list-store object instead.