Garbage appears in the buffer at startup #19666

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1. h-east

   added

   bug

   on Mar 13, 2026
2. h-east commented on Mar 13, 2026

   

   h-east

   on Mar 13, 2026

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   Cc: @64-bitman

   👀React with 👀1Reacted by Foxe Chen
3. 64-bitman commented on Mar 13, 2026

   

   64-bitman

   on Mar 13, 2026

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   I cannot reproduce, does this happen when run with --clean? If it doesn't can you share your vimrc? Thanks
4. h-east commented on Mar 13, 2026

   

   h-east

   on Mar 13, 2026

   Last edited by h-east

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   tabline_example_bad.vim

   vim9script
   
   set showtabline=2
   if has("gui_running")
   endif
   &tabline = "%!MyTabLine()"
   def g:MyTabLine(): string
     var tabpages_info = ''
     if tabpagenr('$') > 1
       tabpages_info = $"%#TabLine#[{tabpagenr()}/{tabpagenr('$')}]%#TabLineFill# "
     endif
     return $"{tabpages_info}cwd: {fnamemodify(getcwd(), ":~")} {GitStatus()}"
   enddef
   
   def GitStatus(): string
     var branch = system('git branch --show-current 2>/dev/null')
     if v:shell_error != 0
       return ''
     endif
     branch = substitute(branch, '\n', '', 'g')
     var dirty = system('git status --porcelain -uno 2>/dev/null') !=# '' ? ' *' : ''
     return $'({branch}{dirty})'
   enddef
   
   # vim: set et ts=2 sw=2 tw=78:

   ---

   Executing the following will prevent the garbage from remaining indefinitely, but it will briefly appear on the first line of the buffer (the line after the tabline).

   $ vim --clean -S tabline_example_bad.vim
5. o-sdn-o commented on Mar 13, 2026

   

   o-sdn-o

   on Mar 13, 2026

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   Environment

   Ubuntu 24.04.4 LTS
   Windows Terminal 1.23.20211.0

   @h-east I suspect this may be related to a bug in Win32-OpenSSH. Are you using Win32-OpenSSH to connect to Ubuntu?
6. h-east commented on Mar 13, 2026

   

   h-east

   on Mar 13, 2026

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   I suspect this may be related to a bug in Win32-OpenSSH. Are you using Win32-OpenSSH to connect to Ubuntu?

   >ssh -V
   OpenSSH_for_Windows_9.5p2, LibreSSL 3.8.2
   
7. o-sdn-o commented on Mar 13, 2026

   

   o-sdn-o

   on Mar 13, 2026

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   The Win32-OpenSSH release with the fix hasn't been published yet, so it might be worth building it from source (it's fixed there) and seeing how it goes. Building ssh.exe should be enough.
8. h-east commented on Mar 15, 2026

   

   h-east

   on Mar 15, 2026

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   Following the instructions in Commit 751b59e I added :silent to the system() call and the problem disappeared.
   Thank you @mattn 👍

   diff --git a/tabline_example_bad_old.vim b/tabline_example_bad.vim
   index 9da6ff8..8ea1491 100644
   --- a/tabline_example_bad_old.vim
   +++ b/tabline_example_bad.vim
   @@ -14,12 +14,12 @@ def g:MyTabLine(): string
    enddef
    
    def GitStatus(): string
   -  var branch = system('git branch --show-current 2>/dev/null')
   +  silent var branch = system('git branch --show-current 2>/dev/null')
      if v:shell_error != 0
        return ''
      endif
      branch = substitute(branch, '\n', '', 'g')
   -  var dirty = system('git status --porcelain -uno 2>/dev/null') !=# '' ? ' *' : ''
   +  silent var dirty = system('git status --porcelain -uno 2>/dev/null') !=# '' ? ' *' : ''
      return $'({branch}{dirty})'
    enddef
    

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9. h-east

   closed this as completedon Mar 15, 2026