The selection model is broken for a TreeView with on demand loading. When expanding/contracting nodes the selected item jumps to a new node and fires a selection event. The selected item should not be changing as the node is simply being expanded.

Example video and sample code provided.

To reproduce
- run the sample program
- click on a collapsed node to select it
- click the arrow to expand the node

You will see the selection jump to a new item. In some cases the display will show two items as selected.