@Nullable
  private static BaseContent createFromProvider(@NotNull Project project, @NotNull VirtualFile file) {
    VcsBaseContentProvider provider = findProviderFor(project, file);
    if (provider == null) return null;

    if (LOG.isDebugEnabled()) {
      LOG.debug(String.format("Content by provider %s: %s", provider, file));
    }
    return provider.getBaseRevision(file);
  }
@Nullable
  private static BaseContent createFromProvider(@NotNull Project project, @NotNull VirtualFile file)