[vim/vim] Trigger WinScrolled while fold is opened or closed (Issue #21127)

mao-yining created an issue (vim/vim#21127)

I want to trigger a function while newline appears.

But I can't find a way to trigger it while open and closeing folds

Additional context:

To solve the problem that signs are too slow. So only place signs that canbe seen.

```vim
export def Render(bufnr: number = bufnr()): void
  var sy: Signify = bufnr->getbufvar('sy', null_object)
  if sy == null_object
    return
  endif
  sign_unplace('Signify', {buffer: bufnr})
  var signlist = sy.signs
  if empty(signlist)
    return
  endif
  var winid = bufnr->bufwinid()
  if winid == -1
    return
  endif
  var wininfo = winid->getwininfo()[0]
  var botline: number = wininfo.botline + 1 # botline should +1 for wraped line
  var priority: number = get(g:, 'signify_priority', 10)
  var lnum: number = wininfo.topline - 1
  while lnum < botline
    ++lnum
    var end = foldclosedend(lnum)
    if end != -1
      lnum = end
      continue
    endif
    var name = signlist->get(lnum, null_string)
    if name != null_string
      sign_place(0, 'Signify', name, bufnr, {lnum: lnum, priority: priority})
    endif
  endwhile
enddef
```

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