@NotNull
  private static DiffViewer createPropertiesViewer(@NotNull DiffRequest propertyRequest, @NotNull MyPropertyContext propertyContext) {
    if (propertyRequest instanceof SvnPropertiesDiffRequest) {
      return SvnPropertiesDiffViewer.create(propertyContext, ((SvnPropertiesDiffRequest)propertyRequest), true);
    }
    else {
      return ErrorDiffTool.INSTANCE.createComponent(propertyContext, propertyRequest);
    }
  }
@NotNull
  private static DiffViewer createPropertiesViewer(@NotNull DiffRequest propertyRequest, @NotNull MyPropertyContext propertyContext)