v3: various improvements and fixes to real-time updates

src/pages/Dump.tsx

@@ -82,6 +82,7 @@ export function Dump() {
     removeVote,
     lastDumpEvent,
     lastCommentEvent,
+    connectionEpoch,
   } = useWS();
 
   useEffect(() => {
@@ -157,7 +158,9 @@ export function Dump() {
       })
       .catch(() => {});
     return () => controller.abort();
-  }, [selectedDump, token]);
+    // connectionEpoch: re-fetch on reconnect to backfill comments missed while
+    // the socket was down.
+  }, [selectedDump, token, connectionEpoch]);
 
   // Fetch related dumps (backlinks) when dump loads
   useEffect(() => {