Fix a bug in callback functions in align-areas

* lisp/align.el (align-areas): When given a callback function and
JUSTIFY, pick out the correct parameters (bug#30139).  Suggested
by "John Wiegley" <johnw@gnu.org>.

1 files changed, 6 insertions, 3 deletions

diff --git a/lisp/align.el b/lisp/align.el
index 443237b451b..cd72d52df47 100644
--- a/lisp/align.el
+++ b/lisp/align.el
@@ -1216,9 +1216,12 @@ have been aligned.  No changes will be made to the buffer."
           (when area
             (if func
                 (funcall func
-                         (marker-position (car area))
-                         (marker-position (cdr area))
-                         change)
+                         (marker-position (car area))
+                         (marker-position (if (and justify
+                                                   (consp (cdr area)))
+                                              (cadr area)
+                                            (cdr area)))
+                         change)
               (if (not (and justify
                             (consp (cdr area))))
                   (goto-char (cdr area))