New: Create new metadata type and parse theme.xxx as movietheme files to prevent them from being renamed

src/NzbDrone.Core.Test/Extras/Metadata/Consumers/Xbmc/FindMetadataFileFixture.cs

@@ -61,5 +61,18 @@ public void should_return_null_for_scene_nfo()
             Mocker.GetMock<IDetectXbmcNfo>()
                   .Verify(v => v.IsXbmcNfoFile(It.IsAny<string>()), Times.Once());
         }
+
+        [TestCase("theme.mp3", MetadataType.MovieTheme)]
+        [TestCase("theme.mpa", MetadataType.MovieTheme)]
+        [TestCase("Theme.x-flac", MetadataType.MovieTheme)]
+        public void should_return_expected_metadata_type(string fileName, MetadataType metadataType)
+        {
+            var path = Path.Combine(_movie.Path, fileName.AsOsAgnostic());
+
+            var metadataFile = Subject.FindMetadataFile(_movie, path);
+
+            metadataFile.Should().NotBeNull();
+            metadataFile.Type.Should().Be(metadataType);
+        }
     }
 }

src/NzbDrone.Core/Extras/Metadata/Consumers/Xbmc/XbmcMetadata.cs

@@ -83,6 +83,12 @@ public override MetadataFile FindMetadataFile(Movie movie, string path)
                 RelativePath = movie.Path.GetRelativePath(path)
             };
 
+            if (Path.GetFileNameWithoutExtension(filename).Equals("theme", StringComparison.OrdinalIgnoreCase))
+            {
+                metadata.Type = MetadataType.MovieTheme;
+                return metadata;
+            }
+
             if (MovieImagesRegex.IsMatch(filename))
             {
                 metadata.Type = MetadataType.MovieImage;

src/NzbDrone.Core/Extras/Metadata/MetadataType.cs

@@ -4,6 +4,7 @@ public enum MetadataType
     {
         Unknown = 0,
         MovieMetadata = 1,
-        MovieImage = 2
+        MovieImage = 2,
+        MovieTheme = 3
     }
 }