The 30s streaming poll and the gateway poll re-applied /api/sessions and ran a
full sidebar DOM rebuild (list.innerHTML='' + one node tree per row) on every
tick, even when the payload was byte-identical to what was already on screen —
the common case on an idle sidebar.
Add a signature over the applied rows + projects + coarse display state in
_applySessionListPayload and skip renderSessionListFromCache() when it matches
the last rendered signature and no entrance animation is pending. A streaming
row's fields advance each poll so its signature changes and it still repaints;
client-only display toggles (search, active, density, select, lineage
expansion) render through their own paths. The per-refresh INFLIGHT cleanup is
still run on the skip path. The 60s relative-time refresh and all other render
triggers call renderSessionListFromCache directly and are unaffected.
Output-neutral: a skip only happens when the render would produce the same DOM.
node --check + ESLint runtime guard clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
a53f3bdaba
