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f27e5a0d89
Gate canvas existence on the persisted revision id, not content truthiness: an empty-string canvas is a valid kind:40100 revision (and restore can republish one), so keying existence, the Create/Edit label, and the History section on content hid retained history for an existing empty canvas. Bound get_canvas_history's page size to the relay read maximum. A request above 1,000 is silently clamped by the relay, which made `events.len() == page_size` false and nulled the cursor even when older revisions remained, stranding them behind an unreachable page. Reject outside 1..=1000. Reset the shared restore mutation on revision selection change so a failed restore's error can no longer render under a different row. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>