Re: Emacs 27 face :extend attribute not working with pulse.el?

[Eli Zaretskii <eliz@gnu.org>]

> From: Adam Porter <adam@alphapapa.net>
> Date: Thu, 09 Apr 2020 08:18:59 -0500
> 
> > I think this issue may be in pulse.el, because evaluating this code has
> > the same problem:
> >
> >   (pulse-momentary-highlight-one-line (point))
> 
> After further investigation, I've found that setting ":extend t" on the
> pulse-highlight-face seems to fix the problem and restore the behavior
> seen in Emacs 26.3.

Yes, that is the right solution, I think.  But the default should stay
with the :extend attribute nil, IMO.

> This seems like an obvious, easy fix to restore the previous behavior,
> but I don't know if it's the "correct" one, because it appears to have
> the side effect of forcing extension even when
> pulse-momentary-highlight-one-line is called with a face argument which
> does not have ":extend t" set.

Does the patch below produce good results?

diff --git a/lisp/cedet/pulse.el b/lisp/cedet/pulse.el
index 16243e1..8649254 100644
--- a/lisp/cedet/pulse.el
+++ b/lisp/cedet/pulse.el
@@ -161,6 +161,9 @@ pulse-reset-face
 			   (face-background face nil t)
 			 (face-background 'pulse-highlight-start-face)
 			 ))
+  (and face
+       (set-face-extend 'pulse-highlight-face
+                        (face-extend-p face nil t)))
   (put 'pulse-highlight-face :startface (or face
 					    'pulse-highlight-start-face))
   (put 'pulse-highlight-face :iteration 0))

P.S. And *please* in the future report bugs with report-emacs-bug.  It
is tedious to have to mention the URL of emacs-devel discussion in the
log message, instead of just mentioning the bug number.