fix concurrency issue (potentially)

Author: taooceros

Plugins/Flow.Launcher.Plugin.Explorer/Search/Everything/EverythingAPI.cs

@@ -19,9 +19,9 @@ public static class EverythingApi
 
         private const int BufferSize = 4096;
 
-        private static SemaphoreSlim _semaphore = new SemaphoreSlim(1, 1);
+        private static SemaphoreSlim _semaphore = new(1, 1);
         // cached buffer to remove redundant allocations.
-        private static readonly StringBuilder buffer = new StringBuilder(BufferSize);
+        private static readonly StringBuilder buffer = new(BufferSize);
 
         public enum StateCode
         {
@@ -118,14 +118,13 @@ public static async IAsyncEnumerable<SearchResult> SearchAsync(EverythingSearchO
 
             if (option.MaxCount < 0)
                 throw new ArgumentOutOfRangeException(nameof(option.MaxCount), option.MaxCount, "MaxCount must be greater than or equal to 0");
-
-            await _semaphore.WaitAsync(token);
-
-            if (token.IsCancellationRequested)
-                yield break;
-
+            
             try
             {
+                await _semaphore.WaitAsync(token);
+
+                if (token.IsCancellationRequested)
+                    yield break;
 
                 if (option.Keyword.StartsWith("@"))
                 {