Tree, Right Click Context Menu Not Shown on tablet

Vaadin 6 / 7 / 8
1

When i browsing vaadin 7 sampler Tree on iPad , long click on tree item no context menu shown. But for TreeTable and Table it works. Is this a bug?
http://demo.vaadin.com/sampler/#ui/data-presentation/tree

2

The Tree component currently does not support opening the context menu on touch devices (
#9484
).