I suspect this not being parsed as an escape sequence for a newline is to do to with Glib::ustring (and perhaps the underlying C GLib methods) using Unicode, and not parsing that sequence as an escape in a Unicode context. This speculation is mostly based on http://stackoverflow.com/questions/22895212/display-string-with-newline-characters-in-gtktextview
Also fwiw, I found some indications that C++ raw string literals would work, if you type actual line breaks in them. I don't know whether this is the ideal solution, either on a language level or for you personally, but seems worth mentioning.
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