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## Why Fixes #6886. In the channel timeline an edited message shows its newest body, but opening its thread panel showed the stale pre-edit body until the async thread-aux backfill landed (and permanently if it raced or missed). ## Root cause `desktop/src/features/messages/lib/independentThreadPanel.ts` built `events = [head, ...replyEvents]`, discarding the head's aux overlay events (edits `kind:40003`, deletions, reactions) already present in the channel window. `formatTimelineMessages` only applies an edit when the edit event sits in the same array as its target, so the thread head relied solely on `withThreadAux` to re-supply it. ## What - Carry the head's non-content aux events (via `!isTimelineContentEvent`) from the channel window into the thread head's event array, deduped against `replyEvents` by id. - Thread head is now byte-identical to the main timeline the instant the thread opens, independent of the async aux fetch. - Restricted to non-content kinds so reply content rows never leak in. ## Tests - Unit regression `independentThreadPanel.test.mjs` (6 cases): red pre-fix (`"two PRs"`), green post-fix (`"these PRs"`). - e2e `thread-head-stale-edit.spec.ts`: delays thread-replies aux to force the channel-window-vs-thread-aux divergence, then opens the thread via the reply button and asserts the panel head shows the edited body. Verified red pre-fix (stale `message-thread-panel` head), green post-fix. - Full desktop unit suite: **5562 pass / 0 fail**. `biome` + `tsc --noEmit` clean. Origin: Buzz channel `fix-reply-thread-old-view-bug` (#464b982f-fc05-42c8-918f-409e1f05a1df). --------- Signed-off-by: Leo <5faf251baee50ee6bcde338aef6acdd70bb3e60115664c2cd490d94a55dfc488@buzz.block.builderlab.xyz> Co-authored-by: Leo <5faf251baee50ee6bcde338aef6acdd70bb3e60115664c2cd490d94a55dfc488@buzz.block.builderlab.xyz>