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Tree: search does not show all matching nodes

See original GitHub issue

1) Environment

PrimeFaces version: 7.0.7
Does it work on the newest released PrimeFaces version? No
Does it work on the newest sources in GitHub? Not tried
Application server + version: Tomcat 8.5.20
Affected browsers: Firefox, Chrome, Edge

2) Expected behavior

When using filtering on a <p:tree>, I expect the search to show all matching nodes, expanding all ancestor nodes to a matching one.

3) Actual behavior

When both a parent and a child nodes match, only the parent node is shown, i.e. the parent node is not expanded and as a result the child node is not directly visible (one has to expand the parent to see it).

4) Steps to reproduce

Here is a simple two-level tree:

If I start typing nut in the search box, I see the nodes Capsule / Brazil nut, Fibrous drupe / Coconut, Fibrous drupe / Walnut and top node Nut (so far so good) but not its child node Hazelnut.

Actually, Nut / Hazelnut is present in the tree but the Nut node is not expanded.

5) Sample XHTML

<p:tree value="#{treeBean.root}" var="node" filterBy="#{node}" filterMatchMode="contains">
    <p:treeNode>
        <h:outputText value="#{node}"/>
    </p:treeNode>
</p:tree>

6) Sample bean

public class TreeBean {

    private TreeNode root;

    public TreeBean() {
        this.root = new DefaultTreeNode();
        this.root.getChildren().add(buildNode("Achene", "Strawberry"));
        this.root.getChildren().add(buildNode("Capsule", "Brazil nut"));
        this.root.getChildren().add(buildNode("Fibrous drupe", "Coconut", "Walnut"));
        this.root.getChildren().add(buildNode("Legume", "Bean", "Pea", "Peanut"));
        this.root.getChildren().add(buildNode("Nut", "Beech", "Hazelnut", "Oak acorn"));
        this.root.getChildren().add(buildNode("Berry", "Cranberry", "Gooseberry", "Redcurrant", "Tomato"));
        this.root.getChildren().add(buildNode("Drupe", "Apricot", "Cherry", "Olive", "Peach", "Plum"));
    }

    private TreeNode buildNode(String nodeName, String... childrenNames) {
        TreeNode node = new DefaultTreeNode(nodeName);
        for (String childName : childrenNames) {
            node.getChildren().add(new DefaultTreeNode(childName));
        }
        return node;
    }

    public TreeNode getRoot() {
        return root;
    }
}