Multiple instances of the same autocompletion recommendation

[bratpeki]

Preview:

Issue: Vim instantiates 4 instances of the same recommendation for autocompletion.
Platform: Windows 10
Editor: GVim 8.2

[bratpeki]

Update:

Vim offers quadruple keywords (using, using, using, using) and single statements (using).

[kit494way]

When I tried omisharp-roslyn v1.37.6, the duplication is 2, not 4.
I also tried below, and got the same result.

{
  "languageserver": {
    "csharp": {
      "command": "/opt/omnisharp-1.37.7/run",
      "args": ["-lsp"],
      "filetypes": ["cs"]
    }
  }
}

:CocList sources shows duplicated sources.

  * snippets-source        [S]        $          90  snippets
  * snippets               [S]                   90
  * cs-4                   [LS]       .          99
  * cs-3                   [LS]       .          99
  * cs-2                   [LS]       .          99
  * cs-1                   [LS]       .          99
  * file                   [F]        /          10
  * buffer                 [B]                   1
  * around                 [A]                   1

[yatli]

😱 it spawned 4 language servers

[kit494way]

This may be a problem of coc.nvim.
I tried with coc.nvim v0.0.78, then this issue did not happen.
But with coc.nvim v0.0.80, this issue happened.
I tried omnisharp-vim (this also uses omnisharp-roslyn), but the issue like this did not happen.

[bratpeki]

When I tried omisharp-roslyn v1.37.6, the duplication is 2, not 4.
I also tried below, and got the same result.

{
  "languageserver": {
    "csharp": {
      "command": "/opt/omnisharp-1.37.7/run",
      "args": ["-lsp"],
      "filetypes": ["cs"]
    }
  }
}

:CocList sources shows duplicated sources.

  * snippets-source        [S]        $          90  snippets
  * snippets               [S]                   90
  * cs-4                   [LS]       .          99
  * cs-3                   [LS]       .          99
  * cs-2                   [LS]       .          99
  * cs-1                   [LS]       .          99
  * file                   [F]        /          10
  * buffer                 [B]                   1
  * around                 [A]                   1

Yup, disabling the three other language servers results in single autocompletion results. Any idea why multiple instances may be starting up?

[kit494way]

This change of coc.nvim is related.
neoclide/coc.nvim@190ebfc

It seems like omnisharp-roslyn send multiple client/registerCapability requests, and multiple sources are added.
Before the change of coc.nvim, multiple sources are created but only one source is added.

[C-Rmoser]

Having the exact same problem. I'm also using windows. Let me know if you find a solution please.

[C-Rmoser]

Since I didn't manage to solve the problem I wrote a small function to disable the duplicate sources and put it in my vimrc.

" Toggle duplicate LS sources
function Disable_ls_duplicates()
:call CocAction('toggleSource', 'cs-2')
:call CocAction('toggleSource', 'cs-3')
:call CocAction('toggleSource', 'cs-4')
endfunction

" Map the function call
nnoremap dld :call Disable_ls_duplicates()