fix: preserve unloaded sessions before replacement (#4190)

refs #4125

1 files changed, 6 insertions, 2 deletions

diff --git a/src/persist/snapshot.rs b/src/persist/snapshot.rs
index e6ca70f9..07aaf3b9 100644
--- a/src/persist/snapshot.rs
+++ b/src/persist/snapshot.rs
@@ -468,9 +468,13 @@ pub(super) fn parse_history_snapshot(content: &str) -> Result<SessionHistorySnap
 }
 
 pub(super) fn snapshot_file_version(content: &str) -> Option<u32> {
-    serde_json::from_str::<RawSessionSnapshot>(content)
+    #[derive(Deserialize)]
+    struct Header {
+        version: u32,
+    }
+    serde_json::from_str::<Header>(content)
         .ok()
-        .map(|raw| raw.version)
+        .map(|header| header.version)
 }
 
 #[cfg(test)]