Gizmo lines culled incorrectly in 3D with depth_bias -1

[amytimed]

With a large grid, lines get culled when part of them is still on-screen. This prevents me from making a large grid

I made a grid manually using gizmos.line

After moving closer:

[amytimed]

completely forgot to test on latest, will close and do that, and reopen if still happens on latest

[amytimed]

Ok still happens on 0.17.2

But, I've found it only happens when depth_bias is -1.. Here is a reproducer

use bevy::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup)
        .add_systems(Update, draw_grid)
        .run();
}

fn setup(
    mut commands: Commands,
    mut config_store: ResMut<GizmoConfigStore>,
) {
    let (config, _) = config_store.config_mut::<DefaultGizmoConfigGroup>();
    config.depth_bias = -1.; // comment this line out to see the grid appear, leave uncommented and grid is gone
    
    commands.spawn((
        Camera3d::default(),
        Transform::from_xyz(5., 1.5, 4.).looking_at(Vec3::ZERO, Vec3::Y),
    ));
}

fn draw_grid(
    mut gizmos: Gizmos,
) {
    // large green grid by manually adding giant lines
    let grid_size = 500;
    let grid_spacing = 1.0;
    let half_size = (grid_size as f32 * grid_spacing) / 2.;
    let color = LinearRgba::GREEN;
    for i in 0..=grid_size {
        let offset = i as f32 * grid_spacing - half_size;
        gizmos.line(
            Vec3::new(-half_size, 0., offset),
            Vec3::new(half_size, 0., offset),
            color,
        );
        gizmos.line(
            Vec3::new(offset, 0., -half_size),
            Vec3::new(offset, 0., half_size),
            color,
        );
    }
}

If you comment out the .depth_bias = -1., the grid shows up. However, the lines are larger than expected (as reported in #21479), but they're no longer culled

[LeandroVandari]

The root of the problem is the same as #21479, when undoing #20890 the grid displays as normal