runtime(nroff): set define option & add matchit config in ftplugin

Commit: 
https://github.com/vim/vim/commit/8f3277fbbe92ff0e93289fec4bf8e91841e4ae25
Author: Wu, Zhenyu <wuzhe...@ustc.edu>
Date:   Wed Feb 12 20:58:57 2025 +0100

    runtime(nroff): set define option & add matchit config in ftplugin
    
    closes: https://github.com/vim/vim/issues/16619
    
    Signed-off-by: Wu, Zhenyu <wuzhe...@ustc.edu>
    Signed-off-by: Aman Verma <amanraove...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/ftplugin/nroff.vim b/runtime/ftplugin/nroff.vim
index ed0b32f5f..7d3d2a597 100644
--- a/runtime/ftplugin/nroff.vim
+++ b/runtime/ftplugin/nroff.vim
@@ -2,8 +2,11 @@
 " Language:    roff(7)
 " Maintainer:  Aman Verma
 " Homepage:    https://github.com/a-vrma/vim-nroff-ftplugin
+" Document:    https://www.gnu.org/software/groff/manual/groff.html
 " Previous Maintainer: Chris Spiegel <cspie...@gmail.com>
-"              2024 May 24 by Riley Bruins <ribr...@gmail.com> 
('commentstring')
+" Last Changes:
+"      2024 May 24 by Riley Bruins <ribr...@gmail.com> ('commentstring' #14843)
+"      2025 Feb 12 by Wu, Zhenyu <wuzhe...@ustc.edu> (matchit configuration 
#16619)
 
 if exists("b:did_ftplugin")
   finish
@@ -13,5 +16,17 @@ let b:did_ftplugin = 1
 setlocal commentstring=.\\"\ %s
 setlocal comments=:.\\"
 setlocal sections+=Sh
+setlocal define=.\s*de
 
-let b:undo_ftplugin = 'setlocal commentstring< comments< sections<'
+let b:undo_ftplugin = 'setlocal commentstring< comments< sections< define<'
+
+if exists('loaded_matchit')
+  let b:match_words = '^\.\s*ie\>:^\.\s*el\>'
+        \ . ',^\.\s*LB\>:^\.\s*LI\>:^\.\s*LE\>'
+        \ . ',^\.\s*TS\>:^\.\s*TE\>'
+        \ . ',^\.\s*PS\>:^\.\s*P[EF]\>'
+        \ . ',^\.\s*EQ\>:^\.\s*EN\>'
+        \ . ',^\.\s*[\>:^\.\s*]\>'
+        \ . ',^\.\s*FS\>:^\.\s*FE\>'
+  let b:undo_ftplugin .= "| unlet b:match_words"
+endif

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