Method set_open

perro_source/core/perro_ui/src/tree.rs:172–181

(&mut self, index: usize, open: bool)

    }

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

    pub fn toggle_open(&mut self, index: usize) -> bool {
        let Some(item) = self.items.get_mut(index) else {