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Keep Discord member scrolling responsive with viewport-driven caching - #40
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Serve member cache reads and viewport changes independently of HTTP backfill. Keep a bounded GUI page cache, expose pending snapshots, and let the latest visible range drive one coalesced gateway subscription. Document the cache contract and cover rapid viewport changes in tests. Co-Authored-By: GPT-6 <noreply@openai.com>
This was referenced Oct 18, 2026
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Member queries now return a cache snapshot immediately, with pending for a miss, and only Watch.members moves the live Discord subscription. Viewport commands run off the HTTP/backfill queue, unsent op 37 frames coalesce per guild, and the GUI keeps a bounded page cache that prefers visible holes over refreshes. Old Members payloads still decode, and the gateway budget stays inside Discord's 120 frames per minute. The disclosed initial empty-cache case is outside this change; scrolling, queue contention, and the cache contract are covered.
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Fast scrolling through a large Discord member list could leave empty placeholders or wait seconds for obsolete pages. Cache reads shared the HTTP/backfill command queue, and successive page requests displaced the subscribed member windows.
This change makes the visible viewport own the Discord subscription and makes member queries return an immediate cache snapshot with an explicit
pendingflag. An ordered foreground thread handles viewport commands independently of HTTP backfill. The GUI retains 64 pages of 50 members, prioritizes missing visible pages, cancels obsolete work on navigation, and refreshes on member updates with a cache-only polling fallback. Gateway subscriptions coalesce by guild, and listed members do not generate duplicate presence subscriptions.Architecture and pane documentation describe the updated contract. GUI and daemon should be updated together.
Validation:
-gitpackage.Known limitation: an intermittent initial-load state with an empty cache is still under investigation. Cache replies are fast during that state, but its cause is not confirmed. This PR addresses scrolling, queue contention, and cache behavior; it does not claim to resolve that remaining initial subscription issue.