bug#37774: 27.0.50; new :extend attribute broke visuals of all themes and other packages

[Dmitry Gutov]

On 09.12.2019 16:42, Eli Zaretskii wrote:
> > Cc: 37774@debbugs.gnu.org, juri@linkov.net
> > From: Dmitry Gutov <dgutov@yandex.ru>
> > Date: Mon, 9 Dec 2019 16:07:54 +0200
> >
> > > I guess you loaded the tests as a .el file?
> >
> > Exactly. How else do you run the tests interactively?
>
>    M-x load-file RET foo.elc RET
>    M-x ert-run-tests-interactively RET RET

Ok, thanks. It'll be better to use some safer faces, though. Or even 
define those inside the test file.

> > > Why did you lose the sentence that starts with "By default"?
> >
> > Because it's been untrue for some time. More faces than just region and
> > hl-line have this attribute set. I have put the (hopefully) full list in
> > NEWS now, but it's getting ridiculous. Certainly not something to
> > mention in the manual.
>
> We could say something like "'region' and some others".  Not saying
> that some have this by default would be a mistake, IMO.

The original wording implies an exhaustive list. How would you like it 
to be phrased now?