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e91d5615c6
branch_merge_impl swaps the coordinator for the merge target, runs the merge body, then restores the original coordinator. A concurrent /change on the same target during this window publishes against the swapped coord, advancing on-disk manifest state that the restored coord doesn't see. The post-restore refresh was previously gated on merge_result.is_ok(), so the clean-409 path (merge body's post_queue_snapshot drift check returning a recoverable conflict) left the restored coord's cached snapshot stale relative to disk. The next sequential /change seeded its publisher expected_versions from that stale cache and 409'd with ExpectedVersionMismatch — a non-retryable conflict surfaced to a caller with no concurrent writer of their own. Refresh on both Ok and Err paths so cached state cannot diverge from the manifest across the swap-restore window. Add a focused regression test (concurrent_merge_clean_409_does_not_poison_next_change_on_target) that loops the cell-d scenario until the clean-409 branch fires and asserts the follow-up sentinel succeeds in that branch specifically. Co-Authored-By: Ragnor Comerford <ragnor.comerford@gmail.com> |
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