Function nf_window 

#[unsafe(no_mangle)]
pub(crate) unsafe extern "C" fn nf_window(
    context: *const Context,
    action: WindowAction,
    window: u32,
)

Asks for action on the app’s window at position window, done once the current event finishes.

Safety

See the abi module’s contract; window is the position of one of the program’s windows.