Fix off-by-one error in loop support

[segfault-bilibili]

Not tested. Not heavily tested.

Fix #61

[segfault-bilibili]

Unfixed "seam" (at loop end + 1 block offset)

---

Fixed "seam" (at loop end + 0 block offset)

---

Original, the right half "tail" has not yet been overwritten by the loop start block (at loop end + 0 block offset)

[segfault-bilibili]

@CaiMiao

[hozuki]

LGTM.

Thanks for the fix! I don't have plenty of looped audios to test. The test results above proves itself.

[hozuki]

Hmm CI seems failing. I'll try to fix that when not occupied.

[segfault-bilibili]

I don't have plenty of looped audios to test.

You may try Magia Record.

Hmm CI seems failing.

Hmm? Seems to be okay for me: https://ci.appveyor.com/project/segfault-bilibili/deretore/builds/42691233

[segfault-bilibili]

I did nothing than authorizing AppVeyor as a GitHub app and then authorizing it to access my forked repo. Maybe you can just try to revoke access permissions for AppVeyor and then re-grant it in GitHub?

[segfault-bilibili]

However I saw an error in the build log (although it didn't seem to block building process), not sure whether this matters:

https://ci.appveyor.com/project/segfault-bilibili/deretore/builds/42691233?fullLog=true#L234

WARNING: NU1603: Build depends on Cake.Frosting (>= 0.1.0-alpha0078) but Cake.Frosting 0.1.0-alpha0078 was not found. An approximate best match of Cake.Frosting 0.31.0 was resolved.
  NotFound https://www.myget.org/F/cake/api/v3/flatcontainer/system.security.accesscontrol/index.json 2201ms
nuget : NU1605: Detected package downgrade: Cake.Common from 0.31.0 to 0.28.0. Reference the package directly from the project to select a different version. 
At line:1 char:1
+ nuget restore "C:\projects\deretore\external\VGAudio\build\Build.sln"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (NU1605: Detecte...erent version. :String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
 Build -> Cake.Frosting 0.31.0 -> Cake.Common (>= 0.31.0) 
 Build -> Cake.Common (>= 0.28.0)
Committing restore...
Generating MSBuild file C:\projects\deretore\external\VGAudio\build\obj\Build.csproj.nuget.g.props.
Generating MSBuild file C:\projects\deretore\external\VGAudio\build\obj\Build.csproj.nuget.g.targets.
Writing assets file to disk. Path: C:\projects\deretore\external\VGAudio\build\obj\project.assets.json
Failed to restore C:\projects\deretore\external\VGAudio\build\Build.csproj (in 4.2 sec).
Errors in C:\projects\deretore\external\VGAudio\build\Build.csproj
    NU1605: Detected package downgrade: Cake.Common from 0.31.0 to 0.28.0. Reference the package directly from the project to select a different version.
     Build -> Cake.Frosting 0.31.0 -> Cake.Common (>= 0.31.0)
     Build -> Cake.Common (>= 0.28.0)
NuGet Config files used:

[segfault-bilibili]

There's another bug to be fixed: #63

[segfault-bilibili]

I'm sorry but I think this change should be reverted. It didn't actually fix the problem correctly. I'll compose a new PR if I have time.

[segfault-bilibili]

Again I feel very sorry but I think my incorrect patch should be reverted.