Function settle_popup_pane 

pub(crate) async fn settle_popup_pane(
    state: &AppState,
    pane: &str,
    list: Option<Vec<String>>,
    owned: bool,
)

pane, a popup pane that joined its opener’s chain (list) as soon as it opened, once its ownership is settled: with an owner it shares the chain’s limit, in its header and on the host; with none (the opener was taken over meanwhile) it leaves the chain. The host push waits until here, so nothing yields between opening the pane and settling who owns it.