UnigramDev/Unigram/formatted-text-block-dates • 6282a4f • 3 files, +49/-8
Release the relative dates without waiting for Unloaded

ClearBlocks drops its blocks and leaves teardown to the Unloaded event, and
FrameworkElementEx only raises OnUnloaded for an element it saw Loaded on. A
block subscribes from SetText, which runs from OnApplyTemplate, which runs on
the first measure - before Loaded. Dropped in between, it never releases, and
what it holds is a registration in the thread-static RelativeDateService: the
block, its paragraph and its runs pinned for the session, still being ticked.

The other half needs no assumption about when Loaded arrives. The service is
keyed by the Run, and Runs come from the shared pool, so one registration that
outlives its block made that Run unsubscribable for good - every later block
that dequeued it had its date silently never update. Subscribe replaces the
entry now instead of skipping, since a Run being resubscribed always means the
old registration is dead.

Runs still return to the pool through OnUnloaded alone. A missed pool return
costs an allocation rather than a pinned graph, and giving Clear a second path
into the pool wants the recycling audit rather than a guess.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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