Benjamin Brienen 93fc2d12cf Remove incorrect equality comparisons for asset load error types (#15890) ... # Objective The type `AssetLoadError` has `PartialEq` and `Eq` impls, which is problematic due to the fact that the `AssetLoaderError` and `AddAsyncError` variants lie in their impls: they will return `true` for any `Box<dyn Error>` with the same `TypeId`, even if the actual value is different. This can lead to subtle bugs if a user relies on the equality comparison to ensure that two values are equal. The same is true for `DependencyLoadState`, `RecursiveDependencyLoadState`. More generally, it is an anti-pattern for large error types involving dynamic dispatch, such as `AssetLoadError`, to have equality comparisons. Directly comparing two errors for equality is usually not desired -- if some logic needs to branch based on the value of an error, it is usually more correct to check for specific variants and inspect their fields. As far as I can tell, the only reason these errors have equality comparisons is because the `LoadState` enum wraps `AssetLoadError` for its `Failed` variant. This equality comparison is only used to check for `== LoadState::Loaded`, which we can easily replace with an `is_loaded` method. ## Solution Remove the `{Partial}Eq` impls from `LoadState`, which also allows us to remove it from the error types. ## Migration Guide The types `bevy_asset::AssetLoadError` and `bevy_asset::LoadState` no longer support equality comparisons. If you need to check for an asset's load state, consider checking for a specific variant using `LoadState::is_loaded` or the `matches!` macro. Similarly, consider using the `matches!` macro to check for specific variants of the `AssetLoadError` type if you need to inspect the value of an asset load error in your code. `DependencyLoadState` and `RecursiveDependencyLoadState` are not released yet, so no migration needed, --------- Co-authored-by: Joseph <21144246+JoJoJet@users.noreply.github.com>		2024-10-14 01:00:45 +00:00
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scene_viewer	Remove incorrect equality comparisons for asset load error types (#15890)	2024-10-14 01:00:45 +00:00
gamepad_viewer.rs	Migrate from Query::single and friends to Single (#15872)	2024-10-13 20:32:06 +00:00