Incorrect coordinate system scale when rendering on a surface

[sssilver]

Describe the bug
Coordinate system scale when drawing on a Surface does not match the coordinate system scale of the surface size.

To Reproduce
The above image is rendered by the following code:

use quicksilver::{
    geom::{Rectangle, Vector},
    golem::TextureFilter,
    graphics::{Color, Image, PixelFormat, Surface},
    run, Graphics, Input, Result, Settings, Window,
};

fn main() {
    log::set_max_level(log::LevelFilter::Info);
    run(
        Settings {
            title: "Realm",
            ..Settings::default()
        },
        app,
    );
}

async fn app(window: Window, mut gfx: Graphics, mut input: Input) -> Result<()> {
    let width = 200.0;
    let height = 100.0;

    let mut surface = Surface::new(
        &gfx,
        Image::from_raw(&gfx, None, width as u32, height as u32, PixelFormat::RGB)?,
    )?;

    gfx.fit_to_surface(&surface)?;
    gfx.clear(Color::YELLOW);
    gfx.fill_rect(
        &Rectangle::new_sized(Vector::new(width, height)),
        Color::RED,
    );
    gfx.flush(Some(&surface))?;

    gfx.clear(Color::GREEN);
    gfx.fit_to_window(&window);
    let image = surface.detach().unwrap();
    image.set_magnification(TextureFilter::Nearest).unwrap();
    gfx.draw_image(
        &image,
        Rectangle::new_sized(Vector::new(window.size().x / 2.0, window.size().y / 2.0)),
    );
    gfx.present(&window)?;

    loop {
        while let Some(_) = input.next_event().await {}
    }
}

However, since width and height are passed both to Image::from_raw() size for Surface::new() and toRectangle::new_sized(), my expectation is that the red rectangle would completely, seamlessly fill the yellow surface. Instead, it appears on only the lower left ~1/5th of the surface, while the rest of it remains yellow.

Environment and versions (please complete the following information):

• Environment: macOS Catalina
• Rust compiler version: rustc 1.43.1 (8d69840ab 2020-05-04)
• Quicksilver verison: 0.4.0-alpha0.5