Fixed: Ignore .AppleDouble subfolders of season folder

src/NzbDrone.Core.Test/MediaFiles/DiskScanServiceTests/ScanFixture.cs

@@ -162,5 +162,25 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
             Mocker.GetMock<IMakeImportDecision>()
                   .Verify(v => v.GetImportDecisions(It.Is<List<string>>(l => l.Count == 1), _series), Times.Once());
         }
+
+        [Test]
+        public void should_not_scan_subfolder_of_season_folder_that_starts_with_a_period()
+        {
+            GivenParentFolderExists();
+
+            GivenFiles(new List<string>
+                       {
+                           Path.Combine(_series.Path, "Season 1", ".@__thumb", "file1.mkv").AsOsAgnostic(),
+                           Path.Combine(_series.Path, "Season 1", ".@__THUMB", "file2.mkv").AsOsAgnostic(),
+                           Path.Combine(_series.Path, "Season 1", ".hidden", "file2.mkv").AsOsAgnostic(),
+                           Path.Combine(_series.Path, "Season 1", ".AppleDouble", "s01e01.mkv").AsOsAgnostic(),
+                           Path.Combine(_series.Path, "Season 1", "s01e01.mkv").AsOsAgnostic()
+                       });
+
+            Subject.Scan(_series);
+
+            Mocker.GetMock<IMakeImportDecision>()
+                  .Verify(v => v.GetImportDecisions(It.Is<List<string>>(l => l.Count == 1), _series), Times.Once());
+        }
     }
 }

src/NzbDrone.Core/MediaFiles/DiskScanService.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
@@ -57,7 +58,8 @@ namespace NzbDrone.Core.MediaFiles
             _logger = logger;
         }
 
-        private static readonly Regex ExcludedSubFoldersRegex = new Regex(@"(extras|^\..+)(?:\\|\/)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex ExcludedSubFoldersRegex = new Regex(@"(extras)(?:\\|\/)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex ExcludedFoldersRegex = new Regex(@"(?:\\|\/)(\..+)(?:\\|\/)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         public void Scan(Series series)
         {
@@ -98,7 +100,8 @@ namespace NzbDrone.Core.MediaFiles
             }
 
             var videoFilesStopwatch = Stopwatch.StartNew();
-            var mediaFileList = GetVideoFiles(series.Path).Where(file => !ExcludedSubFoldersRegex.IsMatch(series.Path.GetRelativePath(file))).ToList();
+            var mediaFileList = FilterFiles(series, GetVideoFiles(series.Path)).ToList();
+
             videoFilesStopwatch.Stop();
             _logger.Trace("Finished getting episode files for: {0} [{1}]", series, videoFilesStopwatch.Elapsed);
 
@@ -126,6 +129,12 @@ namespace NzbDrone.Core.MediaFiles
             return mediaFileList.ToArray();
         }
 
+        private IEnumerable<string> FilterFiles(Series series, IEnumerable<string> videoFiles)
+        {
+            return videoFiles.Where(file => !ExcludedSubFoldersRegex.IsMatch(series.Path.GetRelativePath(file)))
+                             .Where(file => !ExcludedFoldersRegex.IsMatch(file));
+        }
+
         private void SetPermissions(String path)
         {
             if (!_configService.SetPermissionsLinux)
@@ -145,7 +154,7 @@ namespace NzbDrone.Core.MediaFiles
                 _logger.WarnException("Unable to apply permissions to: " + path, ex);
                 _logger.DebugException(ex.Message, ex);
             }
-        }
+        }       
 
         public void Handle(SeriesUpdatedEvent message)
         {