bug#75226: [31.0.50] C++ ts-mode missing "alignof" as keyword

[Alan Mackenzie <acm@muc.de>]

Hello, Eli and Jacob.

On Wed, Jan 08, 2025 at 14:49:50 +0200, Eli Zaretskii wrote:
> > From: Yuan Fu <casouri@gmail.com>
> > Date: Tue, 7 Jan 2025 19:09:40 -0800
> > Cc: Jacob Faibussowitsch <jacob.fai@gmail.com>,
> >  75226@debbugs.gnu.org

> > I found that both c++-mode and c++-ts-mode fontifies C++ alternative
> > operators like and_eq, xor, etc as keywords. Maybe we should fontify
> > them in operator face (added in Emacs 29) instead?

> What do other editors do?

> Alan, WDYT about this?

For me personally, another face for "alphabetic operators" would
come dangerously close to angry fruit salad.

and_eq, xor, etc. _are_ keywords, so I think it makes sense to fontify
them as such.  The keywords in C++ could be divided into several
categories, including alphabetic operators, and to give each category
its own face would, I think, overload the typical user, who wouldn't
instantly grasp what all the faces meant.  This would be
counterproductive.  I don't think it makes too much sense to single out
just one category of keywords for special treatment.

Currently, C++ Mode has just two faces for these things:
font-lock-keyword-face for alphabetic ones, and the default-face for
those consisting of symbol characters like =, +, ;, .....  This is
adequate, probably, for someone whose native language uses a Latin
script.  Maybe users of other languages see things differently.

-- 
Alan Mackenzie (Nuremberg, Germany).