public void setEnsureVisible(final Set<ExplorerNode> ensureVisible) {
        this.ensureVisible = null;
        if (NullSafe.hasItems(ensureVisible)) {
            this.ensureVisible = new HashSet<>();
            for (ExplorerNode node : ensureVisible) {
                if (node != null && node.getUniqueKey() != null) {
                    this.ensureVisible.add(node.getUniqueKey());
//                    GWT.log("setEnsureVisible: " + node.getName());
                }
            }
        }
    }
For use when setting an initial value for the filter.
stroom-core-client/src/main/java/stroom/explorer/client/presenter/ExplorerTreeModel.java