p-tree: Parent node always undefined in node selection events when Virtual Scrolling is enabled

[nitrousdigital]

Describe the bug

event.node.parent is always undefined in onNodeSelect of a PrimeNG tree when virtual scrolling is enabled

Environment

Discovered in PrimeNG 11.4.10 and reproduced in 15.2.0 (see the attached stackblitz for a demo)

Reproducer

https://stackblitz.com/edit/primeng-treeselection-demo-yvxqt7?file=src/app/app.component.html

Angular version

14.1.3

PrimeNG version

15.2.0

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

16.13.2

Browser(s)

No response

Steps to reproduce the behavior

1. Build a tree (without virtual scrolling enabled) and ensure all parent references are set in the TreeNode model instances.
2. Select a node in the tree
3. Notice that the event.node.parent will be defined for non-root nodes.
4. Now change the display template for your tree, to enable virtual scrolling by adding the following to the <p-tree>

[virtualScroll]="true"
[virtualNodeHeight]="33"
scrollHeight="200px"

5. Select a node in the tree
6. Notice that now the event.node.parent will be undefined for all nodes.

Expected behavior

event.node.parent should contain a valid reference to the parent node for all non-root nodes, even when virtual scrolling is enabled.

[ZawadaMatt]

Any news ?

[cetincakiroglu]

Fixed in #15072