FacesContext.isValidationFailed() should return true if Web Flow's MessageContext has errors

If I use a model validator in webflow and add an error message on the messageContext, the validationFailed flag on JSF will no be triggered. In some use cases (e.g. in a popup dialog), I need to know if validationFailed so I can hide the dialog.

I've been able to accomplish this overriding the method viewRendering on FlowFacesContextLifecycleListener:

@Override
public void viewRendering(RequestContext context, View view, StateDefinition viewState) {
	if (context.getMessageContext().hasErrorMessages()) {
		FacesContext facesContext = FacesContext.getCurrentInstance();
		if (facesContext != null) {
			facesContext.validationFailed();
		}
	}
}