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

[Eli Zaretskii]

> From: Drew Adams <drew.adams@oracle.com>
> CC: "larsi@gnus.org" <larsi@gnus.org>, "damien@cassou.me" <damien@cassou.me>,
>         "54156@debbugs.gnu.org" <54156@debbugs.gnu.org>
> Date: Sat, 26 Feb 2022 22:47:41 +0000
> 
> > I didn't say to use only t.
> 
> I didn't say you did say to use only t.
> 
> You said to use both (separately).  My question was
> why to bother _also_ using `t'.

Because it's future-proof.  And because resetting a color attribute to
'unspecified' so that it overrides the defface is an unusual thing to
do, and so it better stands out in the code, telling everyone that
this is the intent.