emacs-28 36a485a: Obsolete XEmacs compat convention in 'erc-button-press-button'

[Amin Bandali]

branch: emacs-28
commit 36a485a1afb6b352ddb2d036d5ca430f4c6fdd10
Author: Stefan Kangas <stefan@marxist.se>
Commit: Amin Bandali <bandali@gnu.org>

    Obsolete XEmacs compat convention in 'erc-button-press-button'
    
    * lisp/erc/erc-button.el (erc-button-press-button): Advertise new
    calling convention without XEmacs compatibility.
---
 lisp/erc/erc-button.el | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lisp/erc/erc-button.el b/lisp/erc/erc-button.el
index 17d5b61..6997285 100644
--- a/lisp/erc/erc-button.el
+++ b/lisp/erc/erc-button.el
@@ -389,12 +389,11 @@ REGEXP is the regular expression which matched for this 
button."
     (mouse-set-point event)
     (erc-button-press-button)))
 
-;; XEmacs calls this via widget-button-press with a bunch of arguments
-;; which we don't care about.
 (defun erc-button-press-button (&rest _ignore)
   "Check text at point for a callback function.
 If the text at point has a `erc-callback' property,
 call it with the value of the `erc-data' text property."
+  (declare (advertised-calling-convention () "28.1"))
   (interactive)
   (let* ((data (get-text-property (point) 'erc-data))
          (fun (get-text-property (point) 'erc-callback)))