Game window opens off-screen on Windows

[darthdeus]

Bevy version

0.7

Relevant system information

Windows 10

What you did

Running a game with 1920x1080 resolution on a 3440x1440 monitor, with WindowDescriptor being simply the following

App::new()
    .insert_resource(WindowDescriptor {
        width: 1920.0,
        height: 1080.0,
        ..Default::default()
    })

What went wrong

The window opens about 1/3 from both top/left, and the bottom half of the game window is off-screen. Since there is no way to center the window (as in #4876) this is a bit problematic.

I don't think there's any current workaround that doesn't include hardcoding the position (which isn't desirable considering different screen resolutions). winit does allow centering the window rather easily

if let Some(monitor) = window.current_monitor() {
    let screen_size = monitor.size();
    let window_size = window.outer_size();

    window.set_outer_position(winit::dpi::PhysicalPosition {
        x: screen_size.width.saturating_sub(window_size.width) as f64 / 2.
            + monitor.position().x as f64,
        y: screen_size.height.saturating_sub(window_size.height) as f64 / 2.
            + monitor.position().y as f64,
    });
}```

The problem is that even with `winit`, the `monitor.size()` API can only be accessed via a `window`, which isn't available at the time `WindowDescriptor` is created.

[alice-i-cecile]

Possibly a duplicate of #4876. Does #4999 resolve this for you?

[lesleyrs]

I'm on 0.8 but windows 10 as well and for some reason the window sometimes appears off screen, and other times it appears correctly (without changing anything).

The fact it appears off screen doesn't surprise me because I need to use the hidpi setting in Godot as well for games to be centered.

I have no clue as to why it randomly seems to change the position it pops up in though. I'm just using the getting started project and it didn't seem to make a difference if I added the new #4999 centered option or not.