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Frank Li
2a30b01b6d
Bridge the sandboxed HTML-attachment iframe's scroll position into the per-tab scroll memento so a long report returns to where you left it after an in-app tab switch. The preview scrolls inside `sandbox="allow-scripts"` (no `allow-same-origin`), so the parent cannot read its `scrollY`; an injected shim reports it via `postMessage` and a content fingerprint invalidates a stale offset when the attachment changes. Verified: typecheck 6/6 tasks, views Vitest 36/36, desktop Vitest 85/85, iframe-scroll-bridge Playwright spec 6/6 on both system Chrome and bundled Chromium. Known follow-up: a tab switch during the attachment's loading window still erases the saved offset (equivalent to pre-fix behavior, not a regression). Fixes #6405
17 lines
657 B
TypeScript
17 lines
657 B
TypeScript
/**
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* DJB2 string hash — 32-bit unsigned, rendered as base36.
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*
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* Extracted from `rich-content/mounted-block-registry.ts` (same cheap,
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* synchronous hash used by the Mermaid layout cache). Used by the HTML
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* attachment preview to derive a `contentKey` fingerprint of the rendered
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* text so that scroll restoration can detect when the attachment's content
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* changed (re-upload to the same id) and refuse to restore a stale offset.
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*/
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export function hashString(source: string): string {
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let hash = 5381;
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for (let i = 0; i < source.length; i++) {
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hash = ((hash << 5) + hash) ^ source.charCodeAt(i);
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}
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return (hash >>> 0).toString(36);
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}
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