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

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From: Ergus <spacibba <at> aol.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: andreyorst <at> gmail.com, Eli Zaretskii <eliz <at> gnu.org>, 37774 <at> debbugs.gnu.org
Subject: bug#37774: 27.0.50; new :extend attribute broke visuals of all themes and other packages
Date: Thu, 17 Oct 2019 14:38:02 +0200

On Thu, Oct 17, 2019 at 01:36:26PM +0200, Michael Albinus wrote:
>Eli Zaretskii <eliz <at> gnu.org> writes:
>
>>> Do we have something in defface that we can "recommend" to conditionally
>>> specify this attribute when version >= 27 only (maybe a syntax sugar)?
>>
>> (if (>= emacs-major-version 27)
>>     (defface foo...) ; for Emacs 27 and later
>>   (defface foo...)   ; for Emacs 26 and older
>
>I believe it is more complex. There might be situations foo shall not
>extend to EOL, and other situations it should.
>
>The latter case is when foo is used in a "rectangular" context as
>explained. You need to introduce a second face foo-extend, and you must
>replace all uses of foo by foo-extend where needed.
>
>Best regards, Michael.

Sorry, what do you mean by "rectangular" context?

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