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# Objective 1. Previously, the `change_tick` and `last_change_tick` fields on `SystemChangeTick` [were `pub`](https://docs.rs/bevy/0.6.1/bevy/ecs/system/struct.SystemChangeTick.html). 1. This was actively misleading, as while this can be fetched as a `SystemParam`, a copy is returned instead 2. This information could be useful for debugging, but there was no way to investigate when data was changed. 3. There were no docs! ## Solution 1. Move these to a getter method. 2. Add `last_changed` method to the `DetectChanges` trait to enable inspection of when data was last changed. 3. Add docs. # Changelog `SystemChangeTick` now provides getter methods for the current and previous change tick, rather than public fields. This can be combined with `DetectChanges::last_changed()` to debug the timing of changes. # Migration guide The `change_tick` and `last_change_tick` fields on `SystemChangeTick` are now private, use the corresponding getter method instead. |
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| bevy_animation | ||
| bevy_app | ||
| bevy_asset | ||
| bevy_audio | ||
| bevy_core | ||
| bevy_core_pipeline | ||
| bevy_crevice | ||
| bevy_derive | ||
| bevy_diagnostic | ||
| bevy_dylib | ||
| bevy_dynamic_plugin | ||
| bevy_ecs | ||
| bevy_ecs_compile_fail_tests | ||
| bevy_gilrs | ||
| bevy_gltf | ||
| bevy_hierarchy | ||
| bevy_input | ||
| bevy_internal | ||
| bevy_log | ||
| bevy_macro_utils | ||
| bevy_math | ||
| bevy_pbr | ||
| bevy_reflect | ||
| bevy_render | ||
| bevy_scene | ||
| bevy_sprite | ||
| bevy_tasks | ||
| bevy_text | ||
| bevy_transform | ||
| bevy_ui | ||
| bevy_utils | ||
| bevy_window | ||
| bevy_winit | ||