From 993dc8264a740140f308398471a5d05c77071337 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Damir=20Jeli=C4=87?= <poljar@termina.org.uk>
Date: Wed, 13 May 2020 12:26:07 +0200
Subject: [PATCH] base: Return early if we get a duplicate sync response.

---
 matrix_sdk_base/src/client.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/matrix_sdk_base/src/client.rs b/matrix_sdk_base/src/client.rs
index 4a454878..f48c764a 100644
--- a/matrix_sdk_base/src/client.rs
+++ b/matrix_sdk_base/src/client.rs
@@ -633,6 +633,13 @@ impl BaseClient {
         &self,
         response: &mut api::sync::sync_events::Response,
     ) -> Result<()> {
+        // The server might respond multiple times with the same sync token, in
+        // that case we already received this response and there's nothing to
+        // do.
+        if self.sync_token.read().await.as_ref() == Some(&response.next_batch) {
+            return Ok(());
+        }
+
         *self.sync_token.write().await = Some(response.next_batch.clone());
 
         #[cfg(feature = "encryption")]