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# Objective Fixes #16850 ## Solution Add a new function `SubApp::take_extract()`, similar to `Option::take()`, which allows stealing the currently installed extract function of a sub-app, with the intent to replace it with a custom one calling the original one via `set_extract()`. This pattern enables registering a custom "world sync" function similar to the existing one `entity_sync_system()`, to run custom world sync logic with mutable access to both the main and render worlds. ## Testing `cargo r -p ci` currently doesn't build locally, event after upgrading rustc to latest and doing a `cargo update`. |
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