Re: Overriding inherited face attributes

[Boris Buliga]

Hi,

I don't see how it's specific to propetize. I can attach face differently,
for
example, by using add-text-properties or add-face-text-property:

  > (setq my-test-string "hello")
  "hello"
  > (add-text-properties 0 5 '(face (:inherit (:foreground "orange")))
my-test-string)
  nil
  > my-test-string
  #("hello" 0 5 (face (:inherit (:foreground "orange"))))
  ;; insert it and you'll get orange text

  > (setq my-test-string "hello")
  "hello"
  > (add-text-properties 0 5 '(face (:foreground "red" :inherit
(:foreground "orange"))) my-test-string)
  nil
  > my-test-string
  #("hello" 0 5 (face (:foreground "red" :inherit (:foreground "orange"))))
  ;; insert it and you'll get orange text

  > (setq my-test-string "hello")
  "hello"
  > (add-text-properties 0 5 '(face (:inherit (:foreground "orange")
:foreground "red" )) my-test-string)
  nil
  > my-test-string
  #("hello" 0 5 (face (:inherit (:foreground "orange") :foreground "red")))
  ;; insert it and you'll get red text

  > (setq my-test-string "hello")
  "hello"
  > (add-text-properties 0 5 '(face ((:foreground "red") (:inherit
(:foreground "orange")))) my-test-string)
  nil
  > my-test-string
  #("hello" 0 5 (face ((:foreground "red") (:inherit ...))))
  ;; insert it and you'll get red text

  > (setq my-test-string "hello")
  "hello"
  > (add-text-properties 0 5 '(face ((:inherit (:foreground "orange"))
(:foreground "red"))) my-test-string)
  nil
  > my-test-string
  #("hello" 0 5 (face ((:inherit ...) (:foreground "red"))))
  ;; insert it and you'll get orange text

  > (setq my-test-string "hello")
  "hello"
  > (add-face-text-property 0 5 '( :foreground "red" :inherit (:foreground
"orange")) nil my-test-string)
  nil
  > my-test-string
  #("hello" 0 5 (face (:foreground "red" :inherit (:foreground "orange"))))
  ;; insert it and you'll get orange text

  > (setq my-test-string "hello")
  "hello"
  > (add-face-text-property 0 5 '(:inherit (:foreground "orange")
:foreground "red") nil my-test-string)
  nil
  > my-test-string
  #("hello" 0 5 (face (:inherit (:foreground "orange") :foreground "red")))
  ;; insert it and you'll get red text

As you can see, it's a matter of properties. No matter how you add them,
using
propertize, add-text-properties or add-face-text-property.



On Wed, 28 Nov 2018 at 22:37, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Stephen Berman <stephen.berman@gmx.net>
> > Cc: help-gnu-emacs@gnu.org
> > Date: Wed, 28 Nov 2018 21:01:36 +0100
> >
> > It would be helpful to know from precisely which part of the
> > documentation it follows that evaluating this:
> >
> > (insert (propertize "hello" 'face '(:foreground "red" :inherit
> > (:foreground "orange"))))
> >
> > displays "hello" in orange while evaluating this:
> >
> > (insert (propertize "hello" 'face '(:inherit (:foreground "orange")
> > :foreground "red")))
> >
> > displays "hello" in red.
>
> So this is only about what propertize does?  And only when some of the
> later properties override earlier ones?
>
> > I don't see how it follows from the passage in the Lisp manual I
> > cited ("Faces occurring earlier in the list have higher priority")
>
> It doesn't, because what you cited is not related to propertize, it's
> related to how we process faces that come from several different
> sources that affect the same piece of text.
>
>

-- 
Cheers,
Boris