Setting a new base called setSide twice, so the first call kicked off a
comparison against the *old* other side. Scans run concurrently, so that stale
result could land last and win: the left had zoomed into the archive while the
right still showed the parent, which is exactly what it looked like on screen.
Both sides are now set in one go before comparing, and every scan is stamped so a
slower, older run can no longer overwrite a newer result.
Also renamed the pairing entries to mention 'set as base', since marking one side
and picking the other achieves the same thing for items whose names differ and
that wasn't obvious from the wording.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UfhDYRLTpGJSKGP1m3LVJN
alexandrev-tibco
8e4a3e5f62