bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> So we need a special trick to override defface with 'unspecified', and
> that trick is this call:
>
>   (set-face-attribute 'region t :background 'unspecified)
>
> This is handled specially in internal-set-lisp-face-attribute to do
> what Damien wants.

So perhaps set-face-attribute should do that automatically when handed a
nil value?

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