Method upgrade_node

platforms/windows/src/text.rs:242–245

(&self, tree_state: &'a TreeState)

    }

    fn upgrade_node<'a>(&self, tree_state: &'a TreeState) -> Result<Node<'a>> {
        let state = self.state.read().unwrap();
        upgrade_range_node(&state, tree_state)
    }

    fn with_node<F, T>(&self, f: F) -> Result<T>
    where