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superseded/currently_public used published_at presence as a proxy
for page-row relevance, but published_at is carried forward onto
every new draft descended from previously-published content
(Page#clone_attributes_from, Node#save_draft!) -- so it read true
for any draft on an already-published node, whether or not that
specific draft had ever gone live itself. Compare draft_id/head_id
identity directly instead; no timestamp involved. A stale
(superseded) link now redirects to the live public page rather than
an admin URL an anonymous holder can't reach anyway.
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A token's page could stop being node.head_id (superseded by a newer
draft) while still being published_at.present? - the old check only
compared against the current head, so a superseded page fell through
to direct rendering instead of redirecting, serving a stale frozen
snapshot indefinitely instead of the current live content.
Also handles scheduled publishing correctly: a page can be head_id but
not yet public? (published_at in the future) - that case must still
render directly, not redirect into a 404 on the not-yet-live public
URL.
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Lets editors share a draft with people outside the admin system, via a
random per-page token rather than an enumerable id - /preview/<token>.
shared_previews#show is intentionally unauthenticated. Redirects to the
real public URL once the page is published. Surfaced on nodes#show
(Admin Preview + Public Preview, next to Public Link) as generate/revoke
buttons.
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