And besides, a QR Code isn't supposed to have horizontal lines like
that.

> Hmm... shell-mode?  Now I'm beginning to think I don't really
> understand what are the steps to reproduce the problem, and what is
> their meaning (jidanni needs to learn how to report bugs clearly).
> Would you please describe the steps, starting from "emacs -Q"?

There's not much to it: Run the qrencode program:

$ qrencode -t UTF8 x

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   bloggy blog: http://lars.ingebrigtsen.no