master 4004dc6b: Simplify the function `LaTeX-array-update-column-letters'

[Arash Esbati]

branch: master
commit 4004dc6b8f61d45ebdc9dc750e25c6fe024b855e
Author: Arash Esbati <arash@gnu.org>
Commit: Arash Esbati <arash@gnu.org>

    Simplify the function `LaTeX-array-update-column-letters'
    
    * style/array.el (LaTeX-array-update-column-letters): Simplify by
    using seq-functions.  Fix docstring.
---
 style/array.el | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/style/array.el b/style/array.el
index be7baf36..b564e055 100644
--- a/style/array.el
+++ b/style/array.el
@@ -1,6 +1,6 @@
 ;;; array.el --- AUCTeX style for `array.sty'  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2013-2021  Free Software Foundation, Inc.
+;; Copyright (C) 2013-2022  Free Software Foundation, Inc.
 
 ;; Author: Mads Jensen <mje@inducks.org>
 ;; Maintainer: auctex-devel@gnu.org
@@ -56,16 +56,11 @@ package.")
     (LaTeX-array-update-column-letters)))
 
 (defun LaTeX-array-update-column-letters ()
-  "Update and uniquify the value of `LaTeX-array-column-letters'
-and make it buffer local. "
+  "Update and uniquify the local value of `LaTeX-array-column-letters'."
   (set (make-local-variable 'LaTeX-array-column-letters)
-       (mapconcat #'identity
-                  (TeX-delete-duplicate-strings
-                   (split-string
-                    (concat LaTeX-array-column-letters
-                            (mapconcat #'car (LaTeX-array-newcolumntype-list) 
""))
-                    "" t))
-                  "")))
+       (let* ((newtypes (mapconcat #'car (LaTeX-array-newcolumntype-list) ""))
+              (alltypes (concat LaTeX-array-column-letters newtypes)))
+         (seq-concatenate 'string (seq-uniq alltypes #'=)))))
 
 (add-hook 'TeX-auto-prepare-hook #'LaTeX-array-auto-prepare t)
 (add-hook 'TeX-auto-cleanup-hook #'LaTeX-array-auto-cleanup t)