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# Objective After separating `bevy_states`, state installation methods like `init_state` were kept in `bevy_app` under the `bevy_state` feature flag. This is problematic, because `bevy_state` is not a core module, `bevy_app` is, yet it depends on `bevy_state`. This causes practical problems like the inability to use `bevy_hierarchy` inside `bevy_state`, because of circular dependencies. ## Solution - `bevy_state` now has a `bevy_app` feature flag, which gates the new `AppStateExt` trait. All previous state installation methods were moved to this trait. It's implemented for both `SubApp` and `App`. ## Changelog - All state related app methods are now in `AppExtStates` trait in `bevy_state`. - Added `StatesPlugin` which is in `DefaultPlugins` when `bevy_state` is enabled. ## Migration Guide `App::init_state` is now provided by the `bevy_state::app::AppExtStates;` trait: import it if you need this method and are not blob-importing the `bevy` prelude. |
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