Send target to backend before local processing (#5980)

* Send target to backend before local processing

* Create lemon-ravens-sneeze.md

Author: schmidt-sebastian

.changeset/lemon-ravens-sneeze.md

@@ -0,0 +1,5 @@
+---
+"@firebase/firestore": patch
+---
+
+Queries are now send to the backend before the SDK starts local processing, which reduces overall Query latency.

packages/firestore/src/core/sync_engine_impl.ts

@@ -314,6 +314,9 @@ export async function syncEngineListen(
       syncEngineImpl.localStore,
       queryToTarget(query)
     );
+    if (syncEngineImpl.isPrimaryClient) {
+      remoteStoreListen(syncEngineImpl.remoteStore, targetData);
+    }
 
     const status = syncEngineImpl.sharedClientState.addLocalQueryTarget(
       targetData.targetId
@@ -325,9 +328,6 @@ export async function syncEngineListen(
       targetId,
       status === 'current'
     );
-    if (syncEngineImpl.isPrimaryClient) {
-      remoteStoreListen(syncEngineImpl.remoteStore, targetData);
-    }
   }
 
   return viewSnapshot;