> From: Juri Linkov <juri@linkov.net> > Cc: maurooaranda@gmail.com, 64759@debbugs.gnu.org > Date: Fri, 28 Jul 2023 20:30:44 +0300 > > >> >> The semantics of nil could be the same as '((t nil)). > >> > > >> > And what is the semantics of '((t nil)) ? What attributes will the > >> > face have when realized? > >> > >> No attributes. This is the standard value used by empty faces. > > > > What does this mean? For example, what would be the foreground color? > > what would be the font? etc. > > No foreground color, and no font. There can be no such face. > > I'm not familiar with "empty face" notion. A face always has > > attributes when it is fully realized, otherwise Emacs will be unable > > to use it. > > "Empty face" is the standard notion. Here's an example how it's used: > > 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. > 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. > > 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.
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