@Nls
  @Nullable
  private static String getNumber(@NotNull CommittedChangeList changeList) {
    return Optional.ofNullable(changeList.getVcs())
      .map(AbstractVcs::getCachingCommittedChangesProvider)
      .map(CachingCommittedChangesProvider::getChangelistTitle)
      .map(changeListTitle -> changeListTitle + " #" + changeList.getNumber())
      .orElse(null);
  }
@Nls
  @Nullable
  private static String getNumber(@NotNull CommittedChangeList changeList)