runtime(systemd): small fixes to &keywordprg in ftplugin

Commit: 
https://github.com/vim/vim/commit/f416a2220fbd457c3d3389fb0be59bee534a7491
Author: Konfekt <konf...@users.noreply.github.com>
Date:   Wed Oct 2 19:28:44 2024 +0200

    runtime(systemd): small fixes to &keywordprg in ftplugin
    
    closes: https://github.com/vim/vim/issues/15784
    
    Signed-off-by: Konfekt <konf...@users.noreply.github.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/ftplugin/systemd.vim b/runtime/ftplugin/systemd.vim
index 44e70bc22..1b1d24202 100644
--- a/runtime/ftplugin/systemd.vim
+++ b/runtime/ftplugin/systemd.vim
@@ -1,7 +1,7 @@
 " Vim filetype plugin file
 " Language:                    systemd.unit(5)
 " Keyword Lookup Support:      Enno Nagel <enno.nagel+...@gmail.com>
-" Latest Revision:             2024-09-19 (simplify keywordprg #15696)
+" Latest Revision:             2024-10-02 (small fixes to &keywordprg)
 
 if exists("b:did_ftplugin")
   finish
@@ -10,20 +10,20 @@ endif
 runtime! ftplugin/dosini.vim
 
 if has('unix') && executable('less') && exists(':terminal') == 2
-  command -buffer -nargs=1 SystemdKeywordPrg silent exe 'term ' . 
KeywordLookup_systemd(<q-args>)
+  command! -buffer -nargs=1 SystemdKeywordPrg silent exe 'term ++close ' 
KeywordLookup_systemd(<q-args>)
   silent! function KeywordLookup_systemd(keyword) abort
     let matches = matchlist(getline(search(' ^\s*\[\s*.+\s*\]\s*$', 'nbWz')), 
' ^\s*\[\s*(\k+).*\]\s*$')
     if len(matches) > 1
       let section = matches[1]
-      return 'LESS= MANPAGER="less --pattern=''(^|,)\s+' . a:keyword . '=$'' 
--hilite-search" man ' . 'systemd.' . section
+      return 'env LESS= MANPAGER="less --pattern=''(^|,)\s+' . a:keyword . 
'=$'' --hilite-search" man ' . 'systemd.' . section
     else
-      return 'LESS= MANPAGER="less --pattern=''(^|,)\s+' . a:keyword . '=$'' 
--hilite-search" man ' . 'systemd'
+      return 'env LESS= MANPAGER="less --pattern=''(^|,)\s+' . a:keyword . 
'=$'' --hilite-search" man ' . 'systemd'
     endif
   endfunction
   setlocal iskeyword+=-
   setlocal keywordprg=:SystemdKeywordPrg
   if !exists('b:undo_ftplugin') || empty(b:undo_ftplugin)
-    let b:undo_ftplugin = 'setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin = 'setlocal keywordprg< iskeyword< | sil! delc -buffer 
SystemdKeywordPrg'
   else
     let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc 
-buffer SystemdKeywordPrg'
   endif

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