Quick fix: ATTR_BEAMER not showing in autocompletion

[Pedro Andres Aranda Gutierrez <paaguti@gmail.com>]

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Hi,

I needed to prepare a couple of slides on emacs-30.0.91 and while editing
found that I wasn't getting ATTR_BEAMER in the autocompletion. Attached is
a quick fix for that on the main branch. I hope it can be applied on elpa
too and maybe make it to emacs-30 on time.

-- 
Fragen sind nicht da, um beantwortet zu werden,
Fragen sind da um gestellt zu werden
Georg Kreisler

Headaches with a Juju log:
unit-basic-16: 09:17:36 WARNING juju.worker.uniter.operation we should run
a leader-deposed hook here, but we can't yet

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diff --git a/lisp/org-pcomplete.el b/lisp/org-pcomplete.el
index 01ee2ac8b..7ab3bde5f 100644
--- a/lisp/org-pcomplete.el
+++ b/lisp/org-pcomplete.el
@@ -232,7 +232,8 @@ When completing for #+STARTUP, for example, this function returns
 			      ;; a space.
 			      (and (member name '("EXPORT" "SRC")) " "))
 		      block-names)
-		(push (format "ATTR_%s: " name) block-names)))
+		(push (format "ATTR_%s: " name) block-names))
+              (push "ATTR_BEAMER:" block-names))
 	    (mapcar (lambda (keyword) (concat keyword ": "))
 		    (org-get-export-keywords))))
    (substring pcomplete-stub 2)))