Bug fix #262 : 'file not found' after moved dir

Source/FileManager/BackgroundFileSystem.cs

@@ -134,7 +134,8 @@ namespace FileManager
 
         private void AddPath(string path)
         {
-            if (!File.Exists(path)) return;
+            if (!File.Exists(path) && !Directory.Exists(path))
+                return;
             if (File.GetAttributes(path).HasFlag(FileAttributes.Directory))
                 AddUniqueFiles(FileUtility.SaferEnumerateFiles(path, SearchPattern, SearchOption));
             else