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# Objective Fixes #14708 Also fixes some commands not updating tracked location. ## Solution `ObserverTrigger` has a new `caller` field with the `track_change_detection` feature; hooks take an additional caller parameter (which is `Some(…)` or `None` depending on the feature). ## Testing See the new tests in `src/observer/mod.rs` --- ## Showcase Observers now know from where they were triggered (if `track_change_detection` is enabled): ```rust world.observe(move |trigger: Trigger<OnAdd, Foo>| { println!("Added Foo from {}", trigger.caller()); }); ``` ## Migration - hooks now take an additional `Option<&'static Location>` argument --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> |
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| mod.rs | ||
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