gtk:tree-model-sort-iter-is-valid (model iter)

model -- a gtk:tree-model-sort 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:tree-model-sort object. This function is slow. Only use it for debugging and/or testing purposes. The gtk:tree-model-sort implementation is deprecated since 4.10. Use the gtk:sort-list-model implementation instead.