@NotNull
  @Override
  public DiffViewer createComponent(@NotNull DiffContext context, @NotNull DiffRequest request) {
    if (SimpleOnesideDiffViewer.canShowRequest(context, request)) return new SimpleOnesideDiffViewer(context, request);
    if (SimpleDiffViewer.canShowRequest(context, request)) return new SimpleDiffViewer(context, request);
    if (SimpleThreesideDiffViewer.canShowRequest(context, request)) return new SimpleThreesideDiffViewer(context, request);
    throw new IllegalArgumentException(request.toString());
  }
@NotNull
  @Override
  public DiffViewer createComponent(@NotNull DiffContext context, @NotNull DiffRequest request)