362a84dde94d0829e2b1f8a59a688d37e2c14689
Sina #5505 action item: escapeHtml escaped the four common entities but not the apostrophe. Today every consumer uses double-quoted attributes, but a future renderer change to single quotes would silently open a stored-XSS hole. Cheaper to fix now, with a regression test. Also pin the idempotence-by-composition property: a second call re-escapes the & introduced by the first. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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