Is inversion of selection of tree item a reasonable default behavior?

[Vladimir Kovalyuk <ko...@gmail.com>]

When in multiple selection mode it makes sense to inverse the selection
state of tree item when user clicks on link of LinkIconPanel.
But in single selection mode it is not an expected behavior. At least in MS
Windows environment.

Please consider the following implementation:

LinkIconPanel {
...
    protected void onNodeLinkClicked(Object node, BaseTree tree,
AjaxRequestTarget target)
    {
        tree.getTreeState().selectNode(node,
!tree.getTreeState().isNodeSelected(node) ||
!tree.getTreeState().isAllowSelectMultiple());
        tree.updateTree(target);
    }
...
}