Line wrapping print glitch

[manforowicz]

After pressing enter on a wrapped line, it looks as if the line content prints twice (with some visual glitches).

I'm using rustyline-async version 0.4.0 on Linux. Here's the example code I used to demonstrate this issue:

use rustyline_async::{Readline, ReadlineEvent};
use std::io::Write;

#[async_std::main]
async fn main() {
    let (mut readline, mut printer) = Readline::new("> ".to_string()).unwrap();
    
    while let ReadlineEvent::Line(text) = readline.readline().await.unwrap() {
        readline.add_history_entry(text.to_string());
        writeln!(printer, "Hi there!").unwrap();
    }
}

long-line-glitch.mp4

[zyansheep]

Strange, seems like the lines are only getting partially cleared. I don't have the time to look at it right now, but I'd be happy to merge any PRs.
Or if you want commit perms to develop directly on the main branch that's fine to :)