runtime(help): fix wrong check for existing HelpComplete function

Commit: 
https://github.com/vim/vim/commit/c23bfd7922dc20d83c96203d9f8840d0673245cf
Author: zeertzjq <[email protected]>
Date:   Sun Apr 26 14:36:23 2026 +0000

    runtime(help): fix wrong check for existing HelpComplete function
    
    To check for an existing HelpComplete function, exists('*HelpComplete')
    should be used, as exists('HelpComplete') still returns 0 after sourcing
    the ftplugin.
    
    closes: #20073
    
    Signed-off-by: zeertzjq <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/ftplugin/help.vim b/runtime/ftplugin/help.vim
index e77484bff..2f4de1405 100644
--- a/runtime/ftplugin/help.vim
+++ b/runtime/ftplugin/help.vim
@@ -24,7 +24,7 @@ if has("conceal")
   setlocal cole=2 cocu=nc
 endif
 
-if !exists('HelpComplete')
+if !exists('*HelpComplete')
   func HelpComplete(findstart, base)
     if a:findstart
       let colnr = col('.') - 1 " Get the column number before the cursor

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