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Copying a message out of the timeline lost the mention. The rendered chip drops the `@` for display, so the clipboard carried "John Smith" — two ordinary words no composer could bind back to a pubkey. Pasting into another channel produced dead text, and sending it tagged nobody. ## What changed Every Buzz copy now writes two clipboard flavors in one transaction: - **`text/plain`** — readable anywhere, sigils restored, no pubkeys. This is what TextEdit, Slack, and every other external app receive. - **`text/html`** — the same content with each mention wrapped in a span carrying `data-mention-pubkey` / `-label` / `-kind`. On paste, the composer harvests those records, registers each `name → pubkey` with the existing mention machinery, and inserts the content: the chip re-lights and the send path recovers the identity the author tagged. A marker attribute records what the plain flavor holds, so a Markdown copy pastes through the text pipeline and a rendered copy through the HTML one. **Covered surfaces:** timeline selection copy, thread-panel selection copy, forum post/reply selection copy, "Copy message", and composer copy/cut — plus paste in both the channel and forum composers. ## Trust boundary Clipboard HTML is untrusted, and the branch treats it that way: - Records are capped (50), labels bounded (200 chars), and a pubkey must be 64 hex before it can become a `p` tag. - **Only mentions the paste actually shows are registered.** An empty `<span data-mention-pubkey=… -label="Jane Doe">` would otherwise rebind that display name for the rest of the composer session, so a later hand-written @Jane Doe would chip-light convincingly against the attacker's key. Each branch registers only the records whose label appears in the text *it* inserts, matched with `getMentionOffsets` — the same matcher the send-time extractor uses. - **The visibility gate reads only what ProseMirror will insert.** `DOMParser` hard-drops `script`, `style`, `title`, `noscript`, `object`, and `head` content, so `visible<style>@Jane Doe</style>` beside an empty chip span used to smuggle a binding past the gate. Those elements are stripped before either output is derived. - **A partial chip never gains a sigil.** A selection crossing a chip boundary falls through to the browser's default copy, which serializes the full identity attributes around a slice of the text — pasting that invented "@Smith" out of "John Smith". Paste now leaves a fragment as plain text, tolerating only what a whole chip picks up in transit (restored sigil, author casing, U+00A0 swaps, and the label cap's own ellipsis). Both clipboard sides share one `matchChipTextToLabel` helper, in the module that owns the label attributes, so copy and paste cannot drift on what counts as a whole chip. ## Notes - Mention matching reuses `getMentionOffsets`, so code spans and fences are excluded and the longest display name wins. - The plain flavor inlines chip boxes before reading `innerText`; a chip is a flex container, so the browser's own copy split "@John Smith" onto its own line. - `MarkdownMention` and `MacEmacsTextShortcuts` are extracted verbatim from `markdown.tsx` and `useRichTextEditor.ts` to keep both files under the size gate. ## Testing - ~40 unit tests over the flavor builder/parser, the visibility filter, the ignored-tag sweep, and the chip-match verdicts. - A Playwright spec (`desktop/tests/e2e/mention-clipboard.spec.ts`) driving real copy/cut/paste DOM events: timeline and "Copy message" of a multi-word non-member mention pasted into another channel and sent with the original pubkey in its `p` tag; the forum copy → forum reply round trip; composer copy/cut; plain flavor asserted to contain no 64-hex string; the boundary-crossing drag; and the hidden-record and `<style>` smuggling vectors. - Every regression test is bound to a production seam and fails with its guard removed. - `just ci` / pre-push lanes green (5927 desktop unit tests, typecheck, lint, file-size gate). --------- Signed-off-by: Matt Toohey <contact@matttoohey.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>