>> 1. M-x make-empty-face RET foo RET
>> 2. M-x customize-face RET foo RET
>>
>> Then output is:
>>
>> Hide Foo face: [sample]
>> State : NO CUSTOMIZATION DATA; not intended to be customized.
Please note that the problem is still unfixed for
"NO CUSTOMIZATION DATA".
>> nil
>> -- Empty face --
>
> We are mis-communicating. My point is that we need to explain in the
> documentation the effect of such a defface when the face is realized
> and displayed. Lisp programmers need to understand that to be able to
> use this correctly and predictably.
For example, in *scratch* eval:
(put-text-property (point-min) (point-max)
'font-lock-face (make-empty-face 'foo))
Then 'C-u C-x =' shows:
There are text properties here:
font-lock-face foo
Then clicking on 'foo' shows:
Face: foo (sample) (customize this face)
Documentation:
Not documented as a face.
Family: unspecified
Foundry: unspecified
Width: unspecified
Height: unspecified
Weight: unspecified
Slant: unspecified
Foreground: unspecified
DistantForeground: unspecified
Background: unspecified
Underline: unspecified
Overline: unspecified
Strike-through: unspecified
Box: unspecified
Inverse: unspecified
Stipple: unspecified
Font: unspecified
Fontset: unspecified
Extend: unspecified
Inherit: unspecified
That's all that Lisp programmers need to know: that in an empty face
all attributes are unspecified.
>> > Only if "no better face to inherit from is available" in all of those
>> > cases. Which I'm not sure is true. If you are sure, please tell why
>> > the faces I put there are not better ideas.
>>
>> Because they will cause the same problem as with display-time-date-and-time,
>> except that other faces are used less often, so it will take time until users
>> will notice these problems.
>
> display-time-date-and-time is used on the mode line, where the colors
> are different. The other faces are for buffer text, so the problems
> with display-time-date-and-time don't necessarily apply.
It's possible that these faces are applied over other faces
that will break the default theme.
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