Forge Engineering 8959623631 fix: render custom channel emoji from description attachmentRuns
YouTube now ships custom channel emoji as attachmentRuns with
:shortcode: placeholders. Walk attachmentRuns with commandRuns in
startIndex order and substitute proxied images for custom emoji while
leaving unicode emoji text alone. Adds spectator coverage. Fixes #5888.

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-09-27 22:50:14 -04:00
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