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bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change t
From: |
Eli Zaretskii |
Subject: |
bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default |
Date: |
Fri, 25 Feb 2022 15:03:02 +0200 |
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: damien@cassou.me, 54156@debbugs.gnu.org
> Date: Fri, 25 Feb 2022 13:30:14 +0100
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > Does this issue happen only with the nil values of :background? If
> > so, may I ask what do you and Damien think should be the effect of
> > setting the background color of a face to nil?
>
> That there is no background colour on the face -- that's the effect of
> doing that (but only on existing frames).
But that's not what nil does in this case. It means the same as
'unspecified': that you have nothing to say about that particular
attribute. So Emacs does nothing.
Think about it: any face attribute not explicitly mentioned in a
defface is set to 'unspecified' by the low-level code. This is basic
in how faces are handled in Emacs; we cannot easily change that
without breaking gobs of code.
Moreover, attributes of the faces for future frames, the ones you get
by calling face-attribute with FRAME = t, are documented to be
'unspecified' by default.
The correct way to do what Damien wants (AFAIU) is this:
(set-face-attribute 'region nil :background 'unspecified)
(set-face-attribute 'region t :background 'unspecified)
That is, one must explicitly call set-face-attribute with FRAME = t
(as well as nil), and pass 'unspecified' (NOT nil!) as the value.
Maybe we should document that, although it is a obscure and unusual
thing to do.
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Damien Cassou, 2022/02/25
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Lars Ingebrigtsen, 2022/02/25
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Eli Zaretskii, 2022/02/25
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Lars Ingebrigtsen, 2022/02/25
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default,
Eli Zaretskii <=
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Lars Ingebrigtsen, 2022/02/25
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Eli Zaretskii, 2022/02/25
- bug#54156: [External] : bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Drew Adams, 2022/02/25
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Lars Ingebrigtsen, 2022/02/26
- bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Eli Zaretskii, 2022/02/26
- bug#54156: [External] : bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Drew Adams, 2022/02/26
- bug#54156: [External] : bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Eli Zaretskii, 2022/02/26
- bug#54156: [External] : bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Drew Adams, 2022/02/26
- bug#54156: [External] : bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Eli Zaretskii, 2022/02/26
- bug#54156: [External] : bug#54156: 28.0.91; set-face-attribute with a nil FRAME doesn't change the default, Drew Adams, 2022/02/26