code: @Deprecated
  	protected String getFormGroupWithFeedback(String additionalClass, String clientId) {
  		if (BsfUtils.isLegacyFeedbackClassesEnabled()) {
  			return additionalClass;
  		}
  		return additionalClass + " " + FacesMessages.getErrorSeverityClass(clientId);
  	}
docs: Get the main field container
  
  @deprecated Use
  {@link CoreInputRenderer#getWithFeedback(net.bootsfaces.render.CoreInputRenderer.InputMode, javax.faces.component.UIComponent)}
  instead
  
  @param additionalClass
  @param clientId
  @return