Method toggle_open

perro_source/core/perro_ui/src/tree.rs:183–189

(&mut self, index: usize)

    }

    pub fn toggle_open(&mut self, index: usize) -> bool {
        let Some(item) = self.items.get_mut(index) else {
            return false;
        };
        item.open = !item.open;
        true
    }

    pub fn select(&mut self, index: Option<usize>) {
        self.selected_index = index.filter(|index| *index < self.items.len());