Bevy version and features

• 0.18.1
• default features

What you did

1. Create a 3d camera entity with RenderTarget::None
2. print value of camera.computed.target_info.
3. Update the RenderTarget::None { size }.

Or run code below:

use bevy::{camera::RenderTarget, prelude::*};
fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup)
        .add_systems(Update, update)
        .run();
}

fn setup(mut commands: Commands) {
    commands.spawn((
        Camera3d::default(),
        RenderTarget::None {
            size: UVec2::splat(512),
        },
    ));
}

fn update(query: Single<(&Camera, &mut RenderTarget)>, time: Res<Time>) {
    let (camera, mut target) = query.into_inner();
    bevy::log::info!("{:?}, {:?}", camera.computed.target_info, *target);
    let size = ((time.elapsed_secs().sin() + 2.0) * 100.0) as u32;
    *target = RenderTarget::None {
        size: UVec2::splat(size),
    };
}

What went wrong

the console outputs:

Some(RenderTargetInfo { physical_size: UVec2(512, 512), scale_factor: 1.0 }), None { size: UVec2(512, 512) }
Some(RenderTargetInfo { physical_size: UVec2(200, 200), scale_factor: 1.0 }), None { size: UVec2(200, 200) }
Some(RenderTargetInfo { physical_size: UVec2(200, 200), scale_factor: 1.0 }), None { size: UVec2(210, 210) }
Some(RenderTargetInfo { physical_size: UVec2(200, 200), scale_factor: 1.0 }), None { size: UVec2(234, 234) }
......

• what were you expecting?
  physical_size should be same as RenderTarget::None { size }
• what actually happened?
  after the second update tick, physical_size remains unchanged

Additional information

the is_changed() function of NormalizedRenderTarget always return false when it is NormalizedRenderTarget::None, making the camera_system failed to update the corresponding value.

I discovered this bug while examining the render_depth_to_texture example. When I modified the size value in RenderTarget::None { size }, the size of the corresponding ViewDepthTexture did not change accordingly.