reresolve address at every reconnect, to avoid problems switching from IPv6 to IPv4-only networks

src/lib.rs

@@ -214,13 +214,12 @@ pub fn connect_and_idle<F: Fn(), G: Fn()>(cli: &Cli, connected_callback: F, mail
 		cli.server.as_str().try_into().unwrap())?;
 
 	let mut addrs = cli.addrs.borrow_mut();
-	if addrs.is_empty() {
-		addrs.extend(
-			(cli.server.as_str(), cli.port)
-				.to_socket_addrs()
-				.map_err(|e|io::Error::new(ErrorKind::NotConnected, e.to_string()))?
-		);
-	}
+	addrs.clear();
+	addrs.extend(
+		(cli.server.as_str(), cli.port)
+			.to_socket_addrs()
+			.map_err(|e|io::Error::new(ErrorKind::NotConnected, e.to_string()))?
+	);
 
 	let mut socket = TcpStream::connect(addrs.as_slice())?;
 	let mut state = ImapState::Unauthenticated;