Iterator.push

Pushes other iterator onto it. All calls performed on it are forwarded to other. If other returns gst.types.IteratorResult.Done, it is popped again and calls are handled by it again.

This function is mainly used by objects implementing the iterator next function to recurse into substructures.

When gst.iterator.Iterator.resync is called on it, other will automatically be popped.

MT safe.