Merge #28775 fix(man.vim): signcolumn causes broken wrap

runtime/ftplugin/man.vim

@@ -8,14 +8,16 @@ let b:did_ftplugin = 1
 
 setlocal noexpandtab tabstop=8 softtabstop=8 shiftwidth=8
 setlocal wrap breakindent linebreak
+setlocal colorcolumn=0 nolist
 
 " Parentheses and '-' for references like `git-ls-files(1)`; '@' for systemd
 " pages; ':' for Perl and C++ pages.  Here, I intentionally omit the locale
 " specific characters matched by `@`.
 setlocal iskeyword=@-@,:,a-z,A-Z,48-57,_,.,-,(,)
 
-setlocal nonumber norelativenumber
-setlocal foldcolumn=0 colorcolumn=0 nolist nofoldenable
+" man page content is likely preformatted for the terminal width, so
+" narrowing display by any additional columns leads to Embarrassing Line Wrap
+setlocal nonumber norelativenumber foldcolumn=0 signcolumn=auto
 
 setlocal tagfunc=v:lua.require'man'.goto_tag
 
@@ -35,6 +37,8 @@ if get(g:, 'ft_man_folding_enable', 0)
   setlocal foldenable
   setlocal foldmethod=indent
   setlocal foldnestmax=1
+else
+  setlocal nofoldenable
 endif
 
 let b:undo_ftplugin = ''