bug#53629: 27.1: add option to change face `mode-line-buffer-id` when mode-line is inactive

[Lars Ingebrigtsen]

José Júnior <jjnilton@gmail.com> writes:

> Thanks, I think it's perfect now. It would be good to have it
> documented, indeed.

I've now added this as mode-line-window-selected-p to Emacs 29 and
documented it in the mode line section of the manual.

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