Re: Emacs 31.0.50 (2f1052d9b0de) will line-number in some buffers which shouldn't show it, is there some changed in recent master branch related to display-line-number

[Eli Zaretskii <eliz@gnu.org>]

> From: Konstantin Kharlamov <Hi-Angel@yandex.ru>
> Date: Fri, 03 Jan 2025 12:31:23 +0300
> 
> On Fri, 2025-01-03 at 03:21 -0600, Stefan Kangas wrote:
> > Konstantin Kharlamov <Hi-Angel@yandex.ru> writes:
> > 
> > > On Fri, 2025-01-03 at 13:45 +0800, Eval EXEC wrote:
> > > > Hello, I am building Emacs from source, and I’ve noticed
> > > > something
> > > > unusual. Line numbers appear in my rg and xref buffers, but they
> > > > disappear after approximately 100ms. This happens even though
> > > > I’ve
> > > > only
> > > > configured display-line-number-mode to be enabled in prog-mode
> > > > via an
> > > > add-hook.
> > > > 
> > > > Has there been any recent change in the code related to display-
> > > > line-
> > > > number-mode that might explain this behavior?
> > > > 
> > > > Thank you for your help!
> > > 
> > > FWIW, I just tried building Emacs from latest commit to look at it,
> > > but
> > > it doesn't even build with `Error: void-function (rx)`.
> > > 
> > > Now, I know Emacs build system has some controversial design
> > > decisions
> > > that were discussed a few months ago (which basically lead to
> > > errors
> > > like that), so I tried removing `build/` dir completely and `find -
> > > type
> > > f -name "*.elc" -delete` but it didn't help. 🤷
> > 
> > Did you try make bootstrap?
> 
> Nope.

Why not?

> I think if I remove the repo completely, the error will go away,
> because that's how it usually works with that kind of errors. But IMO
> this is a bug in build system, because build system should handle
> rebuilds without any kind of cleaning or removing specific files.

As already abundantly explained in the past, there are valid reasons
for us not to reach that ideal in 100% of cases.  That's why when a
build fails, the Makefile suggests "make bootstrap".  To make
shortcuts, you need to know many intimate details of how Emacs is
built and how it works, and we don't expect that from casual builders.