Eli Zaretskii writes:

> I'd prefer we fix this particular problem:
>
>> Emacs does the same thing: it paints the extra space using the
>> background color of the default face.  The problem is that Emacs frames
>> may also have fringes which usually don't have the same background
>> color.  As a result Emacs draws a "line" with the same color as *the*
>> background color to the right of the right fringe (and below the echo
>> area).
>
> Can you show a screenshot of this?