public static void showDiff(final DiffProvider diffProvider, final VcsRevisionNumber revisionNumber, final VirtualFile selectedFile,
                              final Project project) {
    final DiffActionExecutor executor = new CompareToFixedExecutor(diffProvider, selectedFile, project, null, revisionNumber);
    executor.showDiff();
  }
public static void showDiff(final DiffProvider diffProvider, final VcsRevisionNumber revisionNumber, final VirtualFile selectedFile,
                              final Project project)