bug#14984: 24.3.50; "-bg black" command line option should automatically set foreground color

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Wed, 14 Aug 2019 21:07:34 -0700
> Cc: 14984@debbugs.gnu.org
> 
> > If one starts emacs with just "-bg black", it results in black text on a
> > black background, although most colored emacs faces are ok as they
> > automatically adapt the black background.
> >
> > This is obviously not so user friendly, and it would be good if emacs
> > automatically chose a foreground color to match the background color
> > (absent any explicit "-fg" option).
> 
> Hm...  Well, it might be more user-friendly, but I think it would be
> slightly surprising to also change the -fg colour when you set -bg on
> the command line.  The foreground colour may be specified in .Xdefaults
> or something.
> 
> I guess if there is absolutely no foreground colour specification, then
> setting the foreground upon -bg black would be friendlier, but what if
> the user said -bf "#000001" (i.e., "almost black")?
> 
> So I think special-casing one particular value to DWIM would be
> difficult to justify, and I'm closing this bug report.

I agree.