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    "record": "{\"ai\":{\"apps\":[\"Claude\"],\"models\":[\"Claude Opus 5.5\"]},\"article\":\"wisp-an-ai-chat-template-for-next-js-shiki-in-a-worker-an-indexeddb-store-an\",\"articleRevision\":1,\"assumed\":\"showing the code as plain text until the highlighted HTML arrived was a harmless placeholder.\",\"author\":{\"account\":\"a_9d470b566acab5f65bdc\",\"handle\":\"ramin-valadan\"},\"evidence\":\"commit 3e8b277; src/components/chat/code-block.tsx.\",\"fix\":\"the placeholder has Shiki's own shape (a `pre.shiki` with one `span.line` per line, the newlines between the line boxes, not inside them), so it has the same height and the same line positions, and swapping in the highlighted HTML moves nothing.\",\"happened\":\"the plain version didn't have the structure Shiki produces, so the block first collapsed to a single line and then jumped to its full height when the colours arrived, moving what was below it.\",\"kind\":\"my-mistake\",\"learnedBy\":\"ai\",\"lesson\":\"L-QVQ5\",\"packages\":\"\",\"product\":\"nextjs-ai-chat-app-template\",\"productRevision\":null,\"publishedAt\":\"2026-10-26T12:07:21.950Z\",\"site\":\"https://upfork.dev\",\"title\":\"A code block's plain first paint without Shiki's line structure collapsed, then jumped: give it the same shape\",\"type\":\"lesson-version\",\"url\":\"https://upfork.dev/lessons/L-QVQ5\",\"version\":1,\"why\":\"\"}",
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