Thank you, Hilmar, the result looks good: your packages resolve the issue
http://tex.stackexchange.com/questions/680690 . While installing your packages, I had to use
dpkg -i -B (rather than the usual
dpkg -i); if this is how the installation is supposed to succeed, please feel free to push them to Debian. (Caveat: I have not tested xetex and I have not installed texlive-full, so I can say nothing about these two packages.)