Generate flex direction, wrapping, justification, content alignment, gap
mode and padding mode edits against settled multi-child layouts. Track
their authored groups and replay histories through real layout events.
Settle raw layout property changes after copy sync in the pure runner and
keep derived writes in the user's undo group. Normalize absent and nil
typography references in the independent text model.
Make frontend undo checks account for capped history and grouped layout
entries. Verify segments before eviction and keep missing-undo controls.
AI-assisted-by: GPT-6
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