fn get_windows_for_root(&self, root: xproto::Window) -> Result<Vec<xproto::Window>> {
        let oui = xproto::query_tree(&self.conn, root)?.reply()?;
        Ok(oui.children)
    }
Returns the child windows of a root.
display-servers/x11rb-display-server/src/xwrap/getters.rs