Re: [PATCH v4 0/1] MR320: riched20/tests: Test for ITextDocument::Undo and ITextDocument::Redo (#53289).

[Jinoh Kang (＠iamahuman)]

Jinoh Kang (@iamahuman) commented about dlls/riched20/tests/richole.c:
> -
>  {
> -
>    LONG_PTR cur_undo_limit = SendMessageA(inst->hwnd, EM_SETUNDOLIMIT, inst->undo_limit, 0);
> -
>    ok(cur_undo_limit == inst->undo_limit, "Expected undo limit %Id, got %Id\n",
> -
>       inst->undo_limit, cur_undo_limit);
> -
>    if (count) *count = 0;
> -
>  }
> -
>  else
> -
>  {
> -
>    hr = ITextDocument_Undo(inst->doc, tomTrue, count);
> -
>    todo_wine
> -
>    ok(hr == S_FALSE, "Undo: %#lx\n", hr);
> -
>  }
> -
>  if (SUCCEEDED(hr) && inst->undo_ctl_state == undoStateDisabled)
> -
>  {
> -
>    inst->undo_ctl_state = undoStateActive;
> -
>    inst->last_undo_status = TRUE;

This models the complex behaviour of riched20's undo/redo status return.
Note that adding `inst->last_undo_status = TRUE;` makes the test fail.