@Override
  @NotNull
  public CompositeCommittedChangesProvider.CompositeChangeBrowserSettings createDefaultSettings() {
    Map<AbstractVcs, ChangeBrowserSettings> map = new HashMap<>();
    for(AbstractVcs vcs: myBaseVcss) {
      CommittedChangesProvider<?, ?> provider = vcs.getCommittedChangesProvider();
      assert provider != null;
      map.put(vcs, provider.createDefaultSettings());
    }
    return new CompositeChangeBrowserSettings(map);
  }
@Override
  @NotNull
  public CompositeCommittedChangesProvider.CompositeChangeBrowserSettings createDefaultSettings()