Rows, the selection, the items turned past and the player were matched
by guid alone, so in All Subscriptions two feeds giving a post the same
guid (a blog's RSS and Atom) were one item to the page: clicking the
second selected and marked the first, and the second never read. They
are matched by feed and guid now (entryKey, the key readWrites already
used); data-guid stays on the row for the tests, data-key is matched.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>