bug#42366: UTF8 QR codes vs. emacs

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Lars Ingebrigtsen <larsi@gnus.org>
>> Date: Wed, 05 Aug 2020 12:26:55 +0200
>> Cc: 42366@debbugs.gnu.org
>> 
>> > Compare how
>> > $ qrencode -t UTF8 x
>> > looks in
>> > $ emacs -nw -f shell # vs.
>> > $ emacs     -f shell
>> >
>> > As you can see in the latter it is quite mangled,
>> > perhaps beyond machine recognition.
>> 
>> It's not good in any case, really.  Here's the X version:
>
> Can you send the file itself?

There's no file -- it's just the output from the qrencode command.

>> Note the horizontal lines -- it should be a solid white field.
>
> How do you know that?

Because that's how it displays in the shell:

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