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3103fe97ea
This removes the last refresh mutex. RefreshingBranchesMutex wasn't guarding a data race (Branch.BehindBaseBranch is atomic, and every model write is now bounced onto the UI thread); it was serializing the two branch loads that race at the INITIAL startup stage — an immediate one sorted without the reflog, and an async one that loads the reflog and sorts by recency — so that the recency-sorted write landed last and won. That serialization was never a real guarantee, only "very likely": it relied on the immediate load acquiring the lock before the async load, which had to load the reflog first. Instead, each branch load takes a monotonically increasing sequence number, and its bounce drops the write if a later-started load has already applied. Combined with the preceding commit (immediate load runs before the async one is spawned), this is an actual guarantee: the immediate non-recency load always has a lower sequence than its recency async partner, so the highest sequence number is always held by a recency-sorted load, and highest-wins converges on recency ordering — even if more refreshes fire during the INITIAL window, since each refresh's async out-sequences its own immediate. The guard also subsumes what the mutex gave post-startup: a slow, stale refresh's bounce can no longer clobber a newer refresh's branches. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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