From ec9131e5b656ff6827cd99c9a939c7d018790bf1 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Thu, 5 Nov 2026 00:02:16 +0100
Subject: delta known to sender

---
 src/swarm/sync.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/swarm')

diff --git a/src/swarm/sync.rs b/src/swarm/sync.rs
index dcb29a7..8059fe2 100644
--- a/src/swarm/sync.rs
+++ b/src/swarm/sync.rs
@@ -663,8 +663,14 @@ async fn download_and_apply_delta(
             stats.propagated(delays);
         }
         if let Some(peer_state) = peer_state {
+            let mut peer_state = peer_state.blocking_lock();
             // Sync from it made progress: no heal for a while (`keepalive`).
-            peer_state.blocking_lock().last_sync_rx = Some(Instant::now());
+            peer_state.last_sync_rx = Some(Instant::now());
+            if changed {
+                // From its history: none goes back (`SyncSession::came_from_peer`), nor
+                // is offered back as a delta.
+                peer_state.sync.came_from_peer(&replica.doc, &heads_before);
+            }
         }
         Ok(changed)
     })
-- 
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