Keep confirmed Watch snapshots current

crates/storage/src/mobile_watch.rs

@@ -747,11 +747,11 @@ impl WatchSnapshotSender {
         );
         let selected_entries =
             u32::try_from(entries.len()).map_err(|_| WatchSnapshotError::TooManyEntries)?;
-        self.status = MobileWatchSnapshotStatus {
-            state: MobileWatchSnapshotState::Pending,
-            revision: Some(self.journal.revision),
-            detail: snapshot_detail("pending delivery", selected_entries, self.journal.revision),
-        };
+        self.status = status_from_journal(&self.journal);
+        if self.status.state == MobileWatchSnapshotState::Pending {
+            self.status.detail =
+                snapshot_detail("pending delivery", selected_entries, self.journal.revision);
+        }
         Ok(WatchSnapshotTransfer {
             revision: self.journal.revision,
             selected_entries,

crates/storage/tests/mobile_watch.rs

@@ -261,6 +261,33 @@ fn duplicate_delivery_after_watch_restart_recovers_a_lost_acknowledgement() -> T
     Ok(())
 }
 
+#[test]
+fn confirmed_unchanged_snapshot_stays_current_when_republished() -> TestResult {
+    let directory = tempfile::tempdir()?;
+    let journal = directory.path().join("watch-snapshot.toml");
+    let entries = || vec![entry("otp/alice", "Acme", "alice", b"secret")];
+    let mut sender = WatchSnapshotSender::load(journal.clone());
+    let first = sender.prepare("paired-watch", entries())?;
+    let receipt = WatchRuntime::default()
+        .apply_snapshot(first.snapshot().expose().to_vec())?
+        .receipt()
+        .to_vec();
+    assert_eq!(
+        sender.acknowledge(&receipt)?.state(),
+        MobileWatchSnapshotState::Current
+    );
+
+    assert_eq!(sender.prepare("paired-watch", entries())?.revision(), 1);
+    assert_eq!(sender.status().state(), MobileWatchSnapshotState::Current);
+    let mut reloaded = WatchSnapshotSender::load(journal);
+    assert_eq!(reloaded.status().state(), MobileWatchSnapshotState::Current);
+    reloaded.prepare("paired-watch", entries())?;
+    assert_eq!(reloaded.status().state(), MobileWatchSnapshotState::Current);
+    assert_eq!(reloaded.prepare("paired-watch", Vec::new())?.revision(), 2);
+    assert_eq!(reloaded.status().state(), MobileWatchSnapshotState::Pending);
+    Ok(())
+}
+
 #[test]
 fn authoritative_context_switches_sender_generation_and_rejects_delayed_packets() -> TestResult {
     let directory = tempfile::tempdir()?;