@remotion/studio: Remove timeline sequence hashes

[JonnyBurger]

Summary

• remove rootId from timeline contexts and sequence registrations now that Studio has one active preview root
• remove sequence hashing and cross-root deduplication from timeline calculation
• keep runtime sequence IDs for registration, parent relationships, and React keys
• remove the legacy captured test that combined thumbnail-era roots

Testing

• bun test for the affected Studio timeline suites (188 tests)
• bun test for the affected core sequence suites (52 tests)
• bun run build
• bun run stylecheck

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 27, 2026 9:39am
remotion	Ready	Preview, Comment	Jul 27, 2026 9:39am

[pullfrog]

Important

A stale rootId reference in packages/gif/src/test/Gif.test.tsx will cause a TypeScript error after removing rootId from TimelineContextValue.

Reviewed changes — removes the timeline sequence hashing and rootId deduplication system now that Studio has a single active preview root, and renames the remaining track types for clarity.

• Remove rootId from TSequence and TimelineContextValue — no longer passed in Sequence.tsx, useMediaInTimeline, TimelineContextProvider, Player, or Thumbnail.
• Delete getTimelineSequenceHash — the deduplication-by-hash logic and the uniqueTracks loop in calculate-timeline are removed since every sequence now maps to exactly one track.
• Simplify getTimelineSequenceSortKey — drops the hash-based parent lookup in favor of direct parent field traversal; nonceRanks is now a required parameter.
• Rename types — TrackWithHash → TimelineTrackData, TrackWithHashAndOriginalTimings → TimelineTrackWithOriginalTimings, Track (inner) → exported TimelineTrackData.
• Update all consumers across 34 files in core, player, studio, and test-utils, plus inline test fixture removals for rootId and hash fields.

⚠️ Stale rootId in packages/gif test — will not compile

packages/gif/src/test/Gif.test.tsx constructs a TimelineContextValue (via React.ContextType<typeof Internals.TimelineContext>) with a now-removed rootId property. The PR updated core, player, studio, and test-utils but missed this consumer in the gif package.

Technical details

# Stale `rootId` in `packages/gif` test

## Affected sites
- `packages/gif/src/test/Gif.test.tsx:97` — `rootId: 'test-root'` on a `TimelineContextValue` typed object

## Required outcome
- Remove the `rootId` line from the `timelineContext` object literal in `Gif.test.tsx`

## Suggested approach
Delete line 97 (`rootId: 'test-root',`) — identical to the cleanups performed in `packages/core/src/test/nested-sequences.test.tsx`, `series.test.tsx`, `wrap-sequence-context.tsx`, and `test-utils/src/timeline-context.ts`.

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Note: 1 inline comment(s) dropped because they did not anchor to lines inside the PR diff:

• packages/gif/src/test/Gif.test.tsx:97 (RIGHT) — file not in PR diff

  ^{｜ Fix it ➔ ｜ View workflow run ｜ Using DeepSeek Pro (free via Pullfrog for OSS) (Claude Opus not used — the program covers this model; add its provider key to run your pick) ｜ 𝕏}