sS exceptionToStringShorter_dontDropOuterExceptions(Throwable e) {
  S msg = hideCredentials(unnull(e.getMessage()));
  S className = baseClassName(e);
  if (!eq(className, "RuntimeException")
    && (msg.indexOf("Error") < 0 && msg.indexOf("Exception") < 0))
    ret className + prependIfNempty(": ", msg);
  else
    ret msg;
}

Began life as a copy of #1033996