I add a ListChangeListener to the TreeView.getSelectionModel().getSelectedItems() property.

The first time I select an item, I receive a single event with the selected item as expected.
But the next selections do not work as expected.
When I change the selection and click on another item, I receive 2 events instead of single one :
- first one with empty selection
- second one with the selected item

Simple test case attached to reproduce.