@Override
  public @NotNull String itemPattern(@NotNull LookupElement element) {
    // This method is not synchronized in BaseCompletionLookupArranger.
    // The only shared state accessed here is myAdditionalPrefix,
    // which is declared as volatile and accessed atomically.
    String prefix = itemMatcher(element).getPrefix();
    String additionalPrefix = myAdditionalPrefix;
    return additionalPrefix.isEmpty() ? prefix : prefix + additionalPrefix;
  }
@Override
  public @NotNull String itemPattern(@NotNull LookupElement element)