stdWrap .current and .setContentToCurrent do not return content
With the tslib_content refactoring in 4.5, we now have standalone methods for many pieces of stdWrap, which are chained together at the end of the main stdWrap method. Each standalone helper method takes the $content and $conf, processes it, and returns the $content.
stdWrap_setContentToCurrent() and stdWrap_setCurrent() do not return $content, however. This means that any stdWrap properties coming after these two do not have content to operate on.
(issue imported from #M17372)