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Summary:
Changelog: [General][Added] Added a SurfaceHandlerCommitHook to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the RootShadowNode, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

SurfaceHandlerCommitHook fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901

@meta-cla meta-cla bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Dec 10, 2025
@facebook-github-bot facebook-github-bot added p: Software Mansion Partner: Software Mansion Partner p: Facebook Partner: Facebook labels Dec 10, 2025
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@j-piasecki has exported this pull request. If you are a Meta employee, you can view the originating Diff in D88839901.

j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 11, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 11, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 12, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 12, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 12, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 12, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 12, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 12, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 12, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 15, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 15, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 16, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 16, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 17, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
j-piasecki added a commit to j-piasecki/react-native that referenced this pull request Dec 17, 2025
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
Jakub Piasecki and others added 5 commits December 18, 2025 01:34
…tency

Summary:
Changelog: [General][Changed] - Refactor how shadow tree revisions are promoted as latest for JS consistency

Changes `LazyShadowTreeRevisionConsistencyManager::updateCurrentRevision` to pull the latest commited revision for a given surface id instead of accepting the new revision as a parameter.

This way, the new revision is read from the same place for every update, which opens up the way to implement commit branching. This change will allow to always read from the JS tree revision, if it exists.

Differential Revision: D88151490
Summary:
Changelog: [Internal]

Adds a feature flag for the Fabric commit branching mechanism.

Differential Revision: D88151491
Summary:
Changelog: [General][Changed] - Changed how React changes are commited to the Shadow Tree (behind a feature flag)

Introduces two branches for the Shadow Tree commits - React always commits to the JS revision, while other sources should commit to the main revision. Commits to the JS revision schedule a "merge" commit at the end of the event loop pass to upstream the React changes to the main revision.

"Merge" means taking the JS revision and promoting it to become the new main, losing changes that happened between fork and merge. Preservation of these changes is the responsibility of the party that created them, and they should be reapplied using a commit hook.

Differential Revision: D88151489
Summary: Changelog: [General][Changed] - The JS revision merge now is scheduled on the main thread

Differential Revision: D88736123
…aints (facebook#54836)

Summary:
Pull Request resolved: facebook#54836

Changelog: [General][Added] Added a `SurfaceHandlerCommitHook` to preserve layout constraints during commits from different threads

Since layout constraints and layout context are being kept in the props of the `RootShadowNode`, it was possible for the JS revision merge to lose an update if it was being commited concurrently.

`SurfaceHandlerCommitHook` fixes this by ensuring that the root node always uses the latest context and constraints.

Differential Revision: D88839901
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