public @NotNull List<DocumentationProvider> getAllProviders() {
    List<DocumentationProvider> providers = myProviders;
    List<DocumentationProvider> extensions = EP_NAME.getExtensionList();

    Collection<DocumentationProvider> result = new LinkedHashSet<>(providers.size() + extensions.size());
    result.addAll(providers);
    result.addAll(extensions);
    return List.copyOf(result);
  }
public @NotNull List<DocumentationProvider> getAllProviders()