Re: frame-set-background-mode changes frame background for special-display frames

[Richard Stallman]

        The value of that :background attribute is the default background for
        `default-frame-alist' - that is, for non-special frames. So, what
        happens is that the `default' face for the new, special frame has its
        background set to the default value of the default face for the
        default-frame-alist.

That seems like the right thing for it to do.

                              Changing the background of face `default' is
        tantamount to changing the background of the frame itself, so as soon
        as this face-attribute change is made, displaying (frame-parameters
        <the new frame>) shows that its background has been changed to the
        default background for default-frame-alist.

Yes, that's normal, right?

Why do you consider this wrong?  Is it that you do something else to
specify the background for that special display frame?

If so, could you show precisely what?