@Override
  public @NotNull PerFileMappings<Language> getScratchesMapping() {
    return new PerFileMappings<>() {
      @Override
      public void setMapping(@Nullable VirtualFile file, @Nullable Language value) {
        myScratchMapping.setMapping(file, value == null ? null : value.getID());
      }

      @Override
      public @Nullable Language getMapping(@Nullable VirtualFile file) {
        return Language.findLanguageByID(myScratchMapping.getMapping(file));
      }
    };
  }
@Override
  public @NotNull PerFileMappings<Language> getScratchesMapping()