Eli Zaretskii <eliz@gnu.org> writes:

>> From: Mauro Aranda <maurooaranda@gmail.com>
>> Date: Fri, 30 Oct 2020 10:20:20 -0300
>> Cc: 13476@debbugs.gnu.org
>>
>> So I'm thinking that perhaps an OK solution, at least for the scroll-bar
>> face, would be to give it a similar definition to that of the cursor
>> face.
>
> Yes, please try that.  If it fixes this minor problem, and doesn't
> produce any unintended effects, it is IMO a fine solution for this
> issue.

I've tried the attached patch.  Now reverting the foreground color
works, and I haven't seen unintended effects so far.