Desktop scale change does not update text

[lukors]

Bevy version

d867b61

Operating system & version

Windows 10

What you did

1. Run the below code, observe how the text fits in the box for future comparison.
2. While it's running, change the desktop scaling in Windows, or move the window to another screen with a different scaling. Observe that the text no longer fits the same way in the box.
3. Press space to "touch" the text. Observe that the text now fits in the box like it should.

use bevy::{prelude::*, text::Text2dBounds};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_startup_system(setup)
        .add_system(touch_text)
        .run();
}

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    let font = asset_server.load("fonts/FiraSans-Bold.ttf");
    let text_style = TextStyle {
        font,
        font_size: 60.0,
        color: Color::WHITE,
    };

    // 2d camera
    commands.spawn_bundle(OrthographicCameraBundle::new_2d());

    // Demonstrate text wrapping
    let box_size = Vec2::new(300.0, 200.0);
    let box_position = Vec2::new(0.0, -250.0);
    commands.spawn_bundle(SpriteBundle {
        sprite: Sprite {
            color: Color::rgb(0.25, 0.25, 0.75),
            custom_size: Some(Vec2::new(box_size.x, box_size.y)),
            ..default()
        },
        transform: Transform::from_translation(box_position.extend(0.0)),
        ..default()
    });
    let text_alignment_topleft = TextAlignment {
        vertical: VerticalAlign::Top,
        horizontal: HorizontalAlign::Left,
    };
    commands.spawn_bundle(Text2dBundle {
        text: Text::with_section(
            "this text wraps in the box",
            text_style,
            text_alignment_topleft,
        ),
        text_2d_bounds: Text2dBounds {
            // Wrap text in the rectangle
            size: box_size,
        },
        // We align text to the top-left, so this transform is the top-left corner of our text. The
        // box is centered at box_position, so it is necessary to move by half of the box size to
        // keep the text in the box.
        transform: Transform::from_xyz(
            box_position.x - box_size.x / 2.0,
            box_position.y + box_size.y / 2.0,
            1.0,
        ),
        ..default()
    });
}

fn touch_text(
    keyboard_input: Res<Input<KeyCode>>,
    mut q_text: Query<&mut Text>,
) {
    if keyboard_input.just_pressed(KeyCode::Space) {
        println!("Pressed space");
        for mut text in q_text.iter_mut() {
            text.sections.iter_mut();
        }
    }
}

What you expected to happen

The text should always fit the same way in the box.

What actually happened

The text does not update along with everything else when the scale changes.

Additional information

This system can be used to work around the issue, but it would be better if something equivalent happened automatically inside Bevy by default:

fn touch_text(
    mut window_resized_events: EventReader<WindowResized>,
    mut q_text: Query<&mut Text>,
) {
    if window_resized_events.iter().next().is_some() {
        for mut text in q_text.iter_mut() {
            text.sections.iter_mut();
        }
    }
}

[DJMcNab]

Can you confirm whether #4689 fixes this issue for your case.

I've tested it with the text2d example, and it fixes that.

[lukors]

I'm on v0.7.0 on my project, and I'm running into some issues trying to upgrade to your branch. So Unfortunately I it seems like it'd be too much work to verify it it fixes it.

I can report it again if it doesn't work after 0.8.0 the next version is out.