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fix(Reanimated): fix Android entering animation flash in experimental LA proxy #10198

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Merged
pawicao merged 3 commits into from
Aug 16, 2026
Merged

fix(Reanimated): fix Android entering animation flash in experimental LA proxy #10198

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6f1b426
fix(Reanimated): fix Android entering animation flash in experimental…
pawicao Aug 10, 2026
29a72a9
add the legacy opacity guard to experimental LA proxy
pawicao Aug 14, 2026
e3d69c1
add changelog entries
pawicao Aug 16, 2026
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1 change: 1 addition & 0 deletions packages/react-native-reanimated/CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,5 +13,6 @@
- Fix `EXC_BAD_ACCESS` crash in `-[REANodesManager performOperations]` when called before the `_performOperations` block is registered on iOS. ([#10229](https://github.com/software-mansion/react-native-reanimated/pull/10229) by [@tomekzaw](https://github.com/tomekzaw))
- Fix missing unmount of ancestors of animated components with exiting animations in experimental Layout Animations Proxy ([#10103](https://github.com/software-mansion/react-native-reanimated/pull/10103) by [@pawicao](https://github.com/pawicao))
- Fix crash when a CSS animation or transition runs between two keyword values on a property that also accepts relative lengths, such as `width` going from `auto` to `auto`. ([#10281](https://github.com/software-mansion/react-native-reanimated/pull/10281) by [@MatiPl01](https://github.com/MatiPl01))
- Fix Android flashes at the start of entering animations in experimental Layout Animations Proxy by temporarily setting opacity 0 at the start of an insert mutation ([#10198](https://github.com/software-mansion/react-native-reanimated/pull/10198) by [@pawicao](https://github.com/pawicao))

### 💡 Others
6 changes: 5 additions & 1 deletion ...-reanimated/Common/cpp/reanimated/LayoutAnimations/LayoutAnimationsProxy_Experimental.cpp
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Expand Up @@ -267,6 +267,9 @@ void LayoutAnimationsProxy_Experimental::updateLightTree(
} else if (layoutAnimationsManager_->hasLayoutAnimation(tag, ENTERING)) {
entering_.push_back(node);
filteredMutations.push_back(mutation);
auto hiddenView = cloneViewWithoutOpacity(mutation.newChildShadowView, propsParserContext);
filteredMutations.push_back(
ShadowViewMutation::UpdateMutation(mutation.newChildShadowView, hiddenView, mutation.parentTag));
} else if (sharedTransitionManager_->tagToName_.contains(tag) && isInsideInactiveBoundary(node)) {
filteredMutations.push_back(mutation);
auto hiddenView = cloneViewWithoutOpacity(mutation.newChildShadowView, propsParserContext);
Expand Down Expand Up @@ -474,7 +477,8 @@ void LayoutAnimationsProxy_Experimental::addOngoingAnimations(SurfaceId surfaceI

const auto layoutAnimationIt = layoutAnimations_.find(tag);

if (layoutAnimationIt == layoutAnimations_.end() || layoutAnimationIt->second.isSettled()) {
if (layoutAnimationIt == layoutAnimations_.end() ||
(layoutAnimationIt->second.isSettled() && !layoutAnimationIt->second.opacity.has_value())) {
continue;
}

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