Fix SaferEnumerateFiles creating too manu open file handles (#1565)

Using the EnumerationOptions overload of EnumerateFiles() serves the same function as the previous manual implementation.

Source/FileManager/FileUtility.cs

@@ -244,27 +244,14 @@ namespace FileManager
 		/// <returns>List of files</returns>
 		public static IEnumerable<LongPath> SaferEnumerateFiles(LongPath path, string searchPattern = "*", SearchOption searchOption = SearchOption.TopDirectoryOnly)
 		{
-			var foundFiles = Enumerable.Empty<LongPath>();
-
-			try
-			{
-				if (searchOption == SearchOption.AllDirectories)
-				{
-					IEnumerable<LongPath> subDirs = Directory.EnumerateDirectories(path).Select(p => (LongPath)p);
-					// Add files in subdirectories recursively to the list
-					foreach (string dir in subDirs)
-						foundFiles = foundFiles.Concat(SaferEnumerateFiles(dir, searchPattern, searchOption));
-				}
-
-				// Add files from the current directory
-				foundFiles = foundFiles.Concat(Directory.EnumerateFiles(path, searchPattern).Select(f => (LongPath)f));
-			}
-			catch (UnauthorizedAccessException) { }
-			catch (PathTooLongException) { }
-            // Symbolic links will result in DirectoryNotFoundException. Ohter logical directories might also. Just skip them. Don't want to risk (or have to handle) infinite recursion
-            catch (DirectoryNotFoundException) { }
-
-			return foundFiles;
+			var enumOptions = new EnumerationOptions
+			{ 
+				RecurseSubdirectories = searchOption == SearchOption.AllDirectories,
+				IgnoreInaccessible = true,
+				ReturnSpecialDirectories = false,
+				MatchType = MatchType.Simple
+			};
+			return Directory.EnumerateFiles(path.Path, searchPattern, enumOptions).Select(p => (LongPath) p);
 		}
 
 		/// <summary>