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# Objective The `BuildChildren` and `BuildWorldChildren` traits are mostly identical, so I decided to try and merge them. I'm not sure of the history, maybe they were added before GATs existed. ## Solution - Add an associated type to `BuildChildren` which reflects the prior differences between the `BuildChildren` and `BuildWorldChildren` traits. - Add `ChildBuild` trait that is the bounds for `BuildChildren::Builder`, with impls for `ChildBuilder` and `WorldChildBuilder`. - Remove `BuildWorldChildren` trait and replace it with an impl of `BuildChildren` for `EntityWorldMut`. ## Testing I ran several of the examples that use entity hierarchies, mainly UI. --- ## Changelog n/a ## Migration Guide n/a |
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Bevy UI
