Function chord_request 

pub fn chord_request(
    key: &Key,
    command: bool,
    shift: bool,
    other_modifiers: bool,
) -> Option<TabRequest>

The desktop tab chord a key press names, if any: Ctrl+T opens a new tab of this app, Ctrl+Shift+T reopens the last closed tab, Ctrl+W closes this tab. command is the platform’s command modifier (Ctrl, or Cmd on macOS); Alt and Super chords are never these.