bug#34569: 26.1.90; Zero wide scroll bars

[martin rudalics]

>> It means though that we have to do some non-standard surgery in the
>> frame parameters area.
>
> That's okay, we already do similar things with some parameters.

You didn't answer that question:

> Note that x_report_frame_params inserts the
> zero value automatically via
>
>   store_in_alist (alistptr, Qscroll_bar_width,
>           (! FRAME_HAS_VERTICAL_SCROLL_BARS (f)
>            ? make_fixnum (0)
>            : FRAME_CONFIG_SCROLL_BAR_WIDTH (f) > 0
>            ? make_fixnum (FRAME_CONFIG_SCROLL_BAR_WIDTH (f))
>            /* nil means "use default width"
>               for non-toolkit scroll bar.
>               ruler-mode.el depends on this.  */
>            : Qnil));
>
> What should we use instead?

martin