bug#42366: UTF8 QR codes vs. emacs

[Robert Pluim]

>>>>> On Wed, 05 Aug 2020 18:03:22 +0300, Eli Zaretskii <eliz@gnu.org> said:
    >> Yes.  Except for the horizontal lines in the X version of Emacs.

    Eli> Can you try other fonts, and see if some of them eliminate the
    Eli> problem?  I think this is simply a matter of the shell window and the
    Eli> terminal emulator using different fonts.

Iʼm not sure about that. On macOS, this is

emacs -Q -font Consolas

emacs-consolas.png
Description: PNG image

And this is the same build, but in a terminal window using Consolas

emacs-nw-consolas.png
Description: PNG image

In the gui version, the cursor looks like it extends 1 pixel below
each component character, whilst in the '-nw' on the bottom of the
cursor lines up exactly.

If I use something else like Menlo, there are horizontal white lines,
but the cursor lines up with the bottom of the characters.

Robert