Samuel Susla

Remove enableDifferentiatorMutationVectorPreallocation feature flag (#57224) Summary: Pull Request resolved: https://github.com/react/react-native/pull/57224 The `enableDifferentiatorMutationVectorPreallocation` flag gated a mutation-vector pre-allocation optimization in the `Differentiator`. It was never ramped and is being removed. The flag defaulted to `false`, so this restores the pre-flag behavior by deleting the gated `reserve(...)` calls (an allocation hint with no effect on diffing results) and keeping the default `mutations.reserve(256)`. Removes the flag definition from `ReactNativeFeatureFlags.config.js`, the gated call sites in `Differentiator.cpp`, and the regenerated feature-flag files (via `yarn featureflags --update`). Changelog: [Internal] Reviewed By: javache Differential Revision: D108411519 fbshipit-source-id: 73844c54627545a111ad2bd83fa09171d87c3396

Fix flex-growing content sizing in <ScrollView> (#57601) Summary: X-link: https://github.com/react/yoga/pull/1997 Pull Request resolved: https://github.com/react/react-native/pull/57601 Preserve available height for flex-growing subtrees nested inside scroll content. Apply optimized flex-basis measurement only when a conservative proof shows that the subtree is height-independent and connected to the nearest scroll ancestor through column-stretch layout edges. Keep authored flex-basis, overflow, padding, absolute-positioning, wrapping, percentage-owner, and box-sizing semantics intact across layout and measurement passes. Gate `boxSizing` cache invalidation with the same Yoga feature so disabling it preserves legacy caching behavior. Add Fantom coverage for native `boxSizing` updates and for rerendering after both `flexBasis` and intrinsic height change. Verify the expected behavior across both `fixYogaFlexBasisFitContentInMainAxis` states. Changelog: [internal] Reviewed By: rubennorte Differential Revision: D112353599 fbshipit-source-id: e6ed62e4733a5e6c60bff2a83d16da3e8336b119

Remove offscreen image request downgrading feature flag (#57226) Summary: Pull Request resolved: https://github.com/react/react-native/pull/57226 This removes the experimental `enableImageRequestDowngradingForNonVisibleImages` feature flag and backs out the behavior it gated. When enabled, `ImageShadowNode` downgraded image requests to prefetch priority for images that layout determined did not intersect the viewport — threading an `ImageRequestPriority` through `ImageRequestParams` and the Apple image managers, and propagating per-node viewport frames during Yoga layout via `experimental_layoutOrigin`/`experimental_layoutFrame` on `LayoutContext`. The flag defaulted to off and was never enabled in a release, and the gated behavior did not deliver the expected improvement, so the feature is removed entirely: `<Image>` once again always requests at immediate priority. This deletes the feature flag, the `ImageRequestPriority` enum and the `ImageRequestParams::priority` field, the priority parameter on `RCTImageManager`/`RCTSyncImageManager`/`RCTImageManagerProtocol`, the `experimental_layout*` `LayoutContext` fields and their Yoga propagation, the iOS request-priority debug overlay, and the associated Fantom test scaffolding. The generated feature-flag sources and the C++ API snapshots are regenerated accordingly. Changelog: [Internal] Reviewed By: javache Differential Revision: D108411690 fbshipit-source-id: 1538ec699ed2857f3d3154d666fac43a1dc64cd1

Remove hideOffscreenVirtualViewsOnIOS feature flag (#57225) Summary: Pull Request resolved: https://github.com/react/react-native/pull/57225 The `hideOffscreenVirtualViewsOnIOS` flag gated hiding of offscreen `VirtualView`s on iOS (setting `self.hidden`) in `RCTVirtualViewComponentView`. It was never ramped and is being removed. The flag defaulted to `false`, so the gated branches never set `hidden`; deleting them restores the pre-flag behavior. The now-unused `ReactNativeFeatureFlags.h` import is also removed. Removes the flag definition from `ReactNativeFeatureFlags.config.js`, the gated call sites in `RCTVirtualViewComponentView.mm`, and the regenerated feature-flag files (via `yarn featureflags --update`). Changelog: [Internal] Reviewed By: javache Differential Revision: D108411518 fbshipit-source-id: 50c5e6558b00c281bf143f780f6a029c9c876a18

Mark loaderRequest __unused in RCTSyncImageManager to fix release-build unused-variable error (#57227) Summary: Pull Request resolved: https://github.com/react/react-native/pull/57227 Changelog: [Internal] Reviewed By: ellemac123 Differential Revision: D108445102 fbshipit-source-id: 5bc01229668d233ca8d8260801dca3b0bada6e2d

Fix unused variable 'moduleClass' in RCTTurboModuleManager.mm (#57221) Summary: Pull Request resolved: https://github.com/react/react-native/pull/57221 changelog: [internal] Reviewed By: javache Differential Revision: D108605640 fbshipit-source-id: 2668aa853715cfb9ebdbe67cbaf45c092a0cb706