bug#25474: 26.0.50; Buffer content invisible

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sat, 21 Jan 2017 14:20:17 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: dancol@dancol.org, 25474@debbugs.gnu.org
> 
>  > You should be able to make that setting conditional on the X display,
>  > I think.  Martin, am I right?
> 
> I'm not sure what "avoid updating multiple .emacs files" means.  Ivor
> can customize the frame parameter in ‘default-frame-alist’ in which case
> it applies to all frames that "understand" the parameter - in the
> particular case to all frames of a >= 26.1 Emacs build.  It can also be
> added manually to this list based on the ‘window-system’ used (`x' in
> the case at hand) preferably via ‘customize-set-variable’ in which case
> it will apply to X frames only.

Ivor's problem only happens when he uses Emacs via a certain X server
that runs on Windows.  I thought there was a way of specifying
parameters default-frame-alist in a way that would cause some
parameter to have a special value in frames on specific X display.