Fixed: Prevent renaming calibre files

src/NzbDrone.Core.Test/MediaFiles/RenameTrackFileServiceFixture.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using FizzWare.NBuilder;
 using Moq;
@@ -26,6 +26,7 @@ namespace NzbDrone.Core.Test.MediaFiles
             _trackFiles = Builder<BookFile>.CreateListOfSize(2)
                                                 .All()
                                                 .With(e => e.Author = _author)
+                                                .With(e => e.CalibreId = 0)
                                                 .Build()
                                                 .ToList();
 

src/NzbDrone.Core/MediaFiles/RenameBookFileService.cs

@@ -71,7 +71,8 @@ namespace NzbDrone.Core.MediaFiles
 
         private IEnumerable<RenameBookFilePreview> GetPreviews(Author author, List<BookFile> files)
         {
-            foreach (var f in files)
+            // Don't rename Calibre files
+            foreach (var f in files.Where(x => x.CalibreId == 0))
             {
                 var file = f;
                 var book = file.Edition.Value;
@@ -109,7 +110,8 @@ namespace NzbDrone.Core.MediaFiles
         {
             var renamed = new List<BookFile>();
 
-            foreach (var bookFile in bookFiles)
+            // Don't rename Calibre files
+            foreach (var bookFile in bookFiles.Where(x => x.CalibreId == 0))
             {
                 var bookFilePath = bookFile.Path;