@SuppressWarnings("unchecked")
        private boolean renderData() throws IOException {
            if (dataListListenerStack.peekFirst() != this) return false; // This listens to some ancestor of the current list, do this later
            renderDataListStart();

            // Add newly arrived data, and as a consequence run data listeners
            for (Object data : list.incoming().drain())
                list.add((Data) data);

            renderDataList(list);
            return true;
        }
Resumes rendering data from the current position.
Called both on completion (by this), and when new data is available (from the new data listener).

@return whether this started rendering
container-core/src/main/java/com/yahoo/processing/rendering/AsynchronousSectionedRenderer.java