how to disable autocmd and augroup from plugin / autoload

Hi,

I the plugin directory vim9script of a plugin of mine, i would like to toggle autocmd.

In plugin part, I got this augroup

foobar/plugin/foobar.vim

....

augroup difflayout

  au!

  autocmd CursorHold *.tmp call EnhancedDiffLayout()

augroup END

....

meanwhile in the following autoload part I got this to toggle autocmd.

foobar/autoload/foobar.vim

export def EnhancedDiffLayout_Toggle() #{{{

  g:EnhancedDiffLayout_Options.autocmd_enabled = !g:EnhancedDiffLayout_Options.autocmd_enabled

  if !g:EnhancedDiffLayout_Options.autocmd_enabled

    echomsg "EnhancedDiffLayout_autocmd disabled"

    autocmd! CursorHold *.tmp call EnhancedDiffLayout()

    augroup! difflayout

  else

    echomsg "EnhancedDiffLayout_autocmd enabled"

    augroup difflayout

      au!

      autocmd CursorHold *.tmp call EnhancedDiffLayout()

    augroup END

  endif

enddef #}}}

It seems at runtime that augroup cannot be deleted because autocmd! does not delete the autocmd. 

How can I fix it ?

Thank you

NiVa

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