🤖 fix: eliminate Processing... flash on diff rendering #1295
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Diffs showed a brief "Processing..." flash even on cache hits due to: - setChunks(null) being called on any cache miss - useState initializer only running on mount - Cache key changing on visibility toggle Fix: Generate plain-text chunks synchronously as immediate fallback, then upgrade to syntax-highlighted version when ready. The hook now never returns null, eliminating the loading state entirely. Net -20 LoC.
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Diffs showed a brief "Processing..." flash even on cache hits due to:
setChunks(null)being called on any cache missuseStateinitializer only running on mountenableHighlighting)Fix: Generate plain-text chunks synchronously as immediate fallback, then upgrade to syntax-highlighted version when ready. The hook now never returns null, eliminating the loading state entirely.
Net -20 LoC
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mux• Model:anthropic:claude-opus-4-5• Thinking:high