Function pane_ended 

pub fn pane_ended(
    broker: Option<&Broker>,
    connection: &str,
    error: Option<&str>,
    settle: bool,
) -> ConnStatus

A pane’s process on connection ended. A status is shared by every pane on the connection, and the overlay covers each of them, so while another pane still has it open nothing changes. The last one leaves it error with error when it could not connect or lost the connection. Otherwise it is disconnected if settle; else it is left for the shared connection’s watcher (remote::link), since that connection can outlive its last pane.