static AutoComplete installCompletionProvider(DefaultCompletionProvider completionProvider, RSyntaxTextArea textArea) swing {
  if (completionProvider == null || textArea == null) null;
  
  completionProvider.setAutoActivationRules(true, " ");
  var autoComplete = new AutoCompletion(completionProvider);
  autoComplete.setAutoCompleteSingleChoices(false);
  autoComplete.setAutoActivationEnabled(true);
  autoComplete.setAutoActivationDelay(2000);
  autoComplete.install(textArea);
  ret autoComplete;
}