runtime: cleanup :Sman command via the undo_ftplugin mechanism (#12967)

Regards to @dkearns as noticed in
vim/vim@2ac708b

Signed-off-by: Christian Brabandt <[email protected]>

Author: Konfekt

runtime/ftplugin/gpg.vim

@@ -27,7 +27,7 @@ if has('unix') && executable('less')
   if exists(':Sman') == 2
     setlocal iskeyword+=-
     setlocal keywordprg=:Sman
-    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
   endif
 endif
 

runtime/ftplugin/modconf.vim

@@ -28,7 +28,7 @@ if has('unix') && executable('less')
   if exists(':Sman') == 2
     setlocal iskeyword+=-
     setlocal keywordprg=:Sman
-    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
   endif
 endif
 

runtime/ftplugin/muttrc.vim

@@ -30,7 +30,7 @@ if has('unix') && executable('less')
   if exists(':Sman') == 2
     setlocal iskeyword+=-
     setlocal keywordprg=:Sman
-    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
   endif
 endif
 

runtime/ftplugin/readline.vim

@@ -42,7 +42,7 @@ if has('unix') && executable('less')
   if exists(':Sman') == 2
     setlocal iskeyword+=-
     setlocal keywordprg=:Sman
-    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
   endif
 endif
 

runtime/ftplugin/sshconfig.vim

@@ -26,7 +26,7 @@ if has('unix') && executable('less')
   if exists(':Sman') == 2
     setlocal iskeyword+=-
     setlocal keywordprg=:Sman
-    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
   endif
 endif
 

runtime/ftplugin/sudoers.vim

@@ -27,7 +27,7 @@ if has('unix') && executable('less')
   if exists(':Sman') == 2
     setlocal iskeyword+=-
     setlocal keywordprg=:Sman
-    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
   endif
 endif
 

runtime/ftplugin/systemd.vim

@@ -30,7 +30,7 @@ if has('unix') && executable('less')
     if !exists('b:undo_ftplugin') || empty(b:undo_ftplugin)
       let b:undo_ftplugin = 'setlocal keywordprg< iskeyword<'
     else
-      let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+      let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
     endif
   endif
 endif

runtime/ftplugin/udevrules.vim

@@ -27,7 +27,7 @@ if has('unix') && executable('less')
   if exists(':Sman') == 2
     setlocal iskeyword+=-
     setlocal keywordprg=:Sman
-    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword<'
+    let b:undo_ftplugin .= '| setlocal keywordprg< iskeyword< | sil! delc -buffer Sman'
   endif
 endif
 

runtime/ftplugin/zsh.vim

@@ -30,7 +30,7 @@ if executable('zsh') && &shell !~# '/\%(nologin\|false\)$'
     compiler zsh
   endif
   setlocal keywordprg=:RunHelp
-  let b:undo_ftplugin .= 'keywordprg<'
+  let b:undo_ftplugin .= 'keywordprg< | sil! delc -buffer RunHelp'
 endif
 
 let b:match_words = '\<if\>:\<elif\>:\<else\>:\<fi\>'