History doesn't seem to work for Readline

[Tommypop2]

Description

Using the arrows to navigate history doesn't work.

Reproduction

use promkit::{preset::readline::Readline, suggest::Suggest};

fn main() -> anyhow::Result<()> {
    let mut p = Readline::default()
        .enable_history()
        .enable_suggest(Suggest::from_iter([
            "apple",
            "applet",
            "application",
            "banana",
        ]))
        .prompt()?;
    loop {
        match p.run() {
            Ok(cmd) => {
                println!("result: {:?}", cmd);
            }
            Err(_) => {
                println!("Bye!");
                break;
            }
        }
    }
    Ok(())
}

Additional Info

When I try to log the history, it seems like the contents section is empty and doesn't get added to.
I tried adding the text entry manually to the history:

use promkit::{preset::readline::Readline, suggest::Suggest};

fn main() -> anyhow::Result<()> {
    let mut p = Readline::default()
        .enable_history()
        .enable_suggest(Suggest::from_iter([
            "apple",
            "applet",
            "application",
            "banana",
        ]))
        .prompt()?;
    loop {
        match p.run() {
            Ok(cmd) => {
                println!("result: {:?}", cmd);
                p.renderer
                    .text_editor_snapshot
                    .after_mut()
                    .history
                    .as_mut()
                    .unwrap()
                    .insert(cmd);
            }
            Err(_) => {
                println!("Bye!");
                break;
            }
        }
    }
    Ok(())
}

This worked for a single entry (I could press the up arrow once to get the previous command) but I couldn't go any further

[dalance]

I'm not the author, so this is just a guess, but it might be intentional.
By explicitly requesting history saving, you can customize which strings are saved and whether they are saved or not.
It might be useful to have an API like p.insert_history(cmd) because calling p.renderer...insert(cmd) is too long.

The issue with the history being cleared will be fixed in #49.