Fixed loose chapters marked as read for Tachiyomi (#1158)

* Tachiyomi-related fixes

* Created unit test for MarkAsReadAnythingUntil

* Applied the requested changes.

API/Controllers/ReaderController.cs

@@ -394,6 +394,10 @@ namespace API.Controllers
             var user = await _unitOfWork.UserRepository.GetUserByUsernameAsync(User.GetUsername(), AppUserIncludes.Progress);
             user.Progresses ??= new List<AppUserProgress>();
 
+            // Tachiyomi sends chapter 0.0f when there's no chapters read.
+            // Due to the encoding for volumes this marks all chapters in volume 0 (loose chapters) as read so we ignore it
+            if (chapterNumber == 0.0f) return true;
+
             if (chapterNumber < 1.0f)
             {
                 // This is a hack to track volume number. We need to map it back by x100

API/Services/ReaderService.cs

@@ -443,7 +443,7 @@ public class ReaderService : IReaderService
     public async Task MarkVolumesUntilAsRead(AppUser user, int seriesId, int volumeNumber)
     {
         var volumes = await _unitOfWork.VolumeRepository.GetVolumesForSeriesAsync(new List<int>() { seriesId }, true);
-        foreach (var volume in volumes.OrderBy(v => v.Number).Where(v => v.Number <= volumeNumber))
+        foreach (var volume in volumes.OrderBy(v => v.Number).Where(v => v.Number <= volumeNumber && v.Number > 0))
         {
             MarkChaptersAsRead(user, volume.SeriesId, volume.Chapters);
         }