Work around weird sequence IDs in thread sync

maufbapi/types/graphql/responses.py

@@ -590,6 +590,8 @@ class Thread(SerializableAttrs):
     can_viewer_reply: bool
     can_participants_claim_admin: bool
 
+    sync_sequence_id: Optional[str] = None
+
     @property
     def updated_timestamp(self) -> int:
         return int(self.updated_time_precise)

mautrix_facebook/user.py

@@ -637,6 +637,17 @@ async def _sync_recent_threads(self, increment_total_backfilled_portals: bool =
         # We need to get the sequence ID before we start the listener task.
         resp = await self.client.fetch_thread_list()
         self.seq_id = int(resp.sync_sequence_id)
+        thread_seq_ids = list(
+            {int(thread.sync_sequence_id) for thread in resp.nodes if thread.sync_sequence_id}
+        )
+        if len(thread_seq_ids) > 1 or (
+            len(thread_seq_ids) == 1 and thread_seq_ids[0] != self.seq_id
+        ):
+            self.seq_id = max(*thread_seq_ids, self.seq_id)
+            self.log.warning(
+                f"Got more than one sequence ID in thread list: primary={resp.sync_sequence_id}, "
+                f"threads={thread_seq_ids}. Using highest value ({self.seq_id})"
+            )
         if self.mqtt:
             self.mqtt.seq_id = self.seq_id
         self.log.debug(f"Got new seq_id {self.seq_id}")