`CiTestingConfig` is blocking `bevy_dev_tools` from using `bevy_render`

[pablo-lua]

Bevy version

After #11341

What you did

Trying to import bevy_render or some crate that depends on bevy_render, like in #12354

What went wrong

This causes circular a dependence, because bevy_render depends internally on bevy_dev_tools

Additional information

Place where we use bevy_dev_tools in bevy_render

impl Plugin for ScreenshotPlugin {
   // . . .

    fn finish(&self, app: &mut bevy_app::App) {
        if let Ok(render_app) = app.get_sub_app_mut(RenderApp) {
            render_app.init_resource::<SpecializedRenderPipelines<ScreenshotToScreenPipeline>>();
        }

        #[cfg(feature = "bevy_ci_testing")]
        if app
            .world
            .contains_resource::<bevy_dev_tools::ci_testing::CiTestingConfig>()
        {
            app.add_systems(bevy_app::Update, ci_testing_screenshot_at);
        }
    }
}

#[cfg(feature = "bevy_ci_testing")]
fn ci_testing_screenshot_at(
    mut current_frame: Local<u32>,
    ci_testing_config: Res<bevy_dev_tools::ci_testing::CiTestingConfig>,
    mut screenshot_manager: ResMut<ScreenshotManager>,
    main_window: Query<Entity, With<bevy_window::PrimaryWindow>>,
) {
// . . .
}

Possible solutions

We can probably

• Move related ci Test (probably used by screenshot example) into tests and adding this Ci system into there, so we can make sure that screenshots are still working. Then we can remove Ci from bevy_render
• Move Ci back to where it was before, reverting the changes on this field, as we shouldn't really rely internally on nothing from inside bevy_dev_tools
• Address this case in specific: If we are relying on screenshot to add this, maybe we can add the needed system somehow inside bevy_dev_tools?

[alice-i-cecile]

I think my preferred choice is actually to move the test out to our top-level tests folder.

Failing that I like just reverting that move.

[pablo-lua]

I think we have it this way now just so we can ensure that Ci exits successfully on screenshot example, tbh. Not sure that it can be moved to tests at all, because its added to the ScreenshotPlugin when bevy_ci_testing feature is on.

[alice-i-cecile]

Ugh right. Let's just revert then. FYI @mockersf.