@Override
  @Nullable
  public DocumentationComponent getDocumentationComponent(@NotNull ToolWindow toolWindow,
                                                          @NotNull DocumentationManager documentationManager) {
    Content content = getDocumentationContent(toolWindow, documentationManager);
    if (content == null) return null;
    return (DocumentationComponent)content.getComponent();
  }
@Override
  @Nullable
  public DocumentationComponent getDocumentationComponent(@NotNull ToolWindow toolWindow,
                                                          @NotNull DocumentationManager documentationManager)