check cancellation to avoid racing issue.

Author: taooceros

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -485,6 +485,9 @@ private async void QueryResults()
             // Switch to ThreadPool thread
             await TaskScheduler.Default;
 
+            if (currentCancellationToken.IsCancellationRequested)
+                return;
+
             var query = QueryBuilder.Build(QueryText.Trim(), PluginManager.NonGlobalPlugins);
 
             // handle the exclusiveness of plugin using action keyword