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Clarify the doc string of 'set-face-attribute'

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* lisp/faces.el (set-face-attribute): Clarify the issue with
resetting attribute values to 'unspecified' for future frames.
(Bug#57499)
This commit is contained in:
Eli Zaretskii 2022-09-01 11:42:33 +03:00
parent f44c4e49b7
commit 89695bce3e
1 changed files with 20 additions and 13 deletions
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33
lisp/faces.el
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@ -668,21 +668,28 @@ If FACE is a face-alias, get the documentation for the target face."
(defun set-face-attribute (face frame &rest args) (defun set-face-attribute (face frame &rest args)
"Set attributes of FACE on FRAME from ARGS. "Set attributes of FACE on FRAME from ARGS.
This function overrides the face attributes specified by FACE's This function overrides the face attributes specified by FACE's face spec.
face spec. It is mostly intended for internal use only. It is mostly intended for internal use.
If FRAME is nil, set the attributes for all existing frames, as If FRAME is a frame, set the FACE's attributes only for that frame. If
well as the default for new frames. If FRAME is t, change the FRAME is nil, set attribute values for all existing frames, as well as
default for new frames only. As an exception, to reset the value the default for new frames. If FRAME is t, change the default values
of some attribute to `unspecified' in a way that overrides the of attributes for new frames.
non-`unspecified' value defined by the face's spec in `defface',
for new frames, you must explicitly call this function with FRAME
set to t and the attribute's value set to `unspecified'; just
using FRAME of nil will not affect new frames in this case.
ARGS must come in pairs ATTRIBUTE VALUE. ATTRIBUTE must be a ARGS must come in pairs ATTRIBUTE VALUE. ATTRIBUTE must be a valid face
valid face attribute name. All attributes can be set to attribute name and VALUE must be a value that is valid for ATTRIBUTE,
`unspecified'; this fact is not further mentioned below. as described below for each attribute.
In addition to the attribute values listed below, all attributes can
also be set to the special value `unspecified', which means the face
doesn't by itself specify a value for the attribute.
When a new frame is created, attribute values in the FACE's `defface'
spec normally override the `unspecified' values in the FACE's
default attributes. To avoid that, i.e. to cause ATTRIBUTE's value
be reset to `unspecified' when creating new frames, disregarding
what the FACE's face spec says, call this function with FRAME set to
t and the ATTRIBUTE's value set to `unspecified'.
The following attributes are recognized: The following attributes are recognized: