Re: [PATCH v2 0/1] MR2068: Draft: comdlg32: Enable visual styles when showing IFileDialog.

[Jinoh Kang (＠iamahuman)]

Jinoh Kang (@iamahuman) commented about dlls/comdlg32/itemdlg.c:
> static HRESULT create_dialog(FileDialogImpl *This, HWND parent)
>  {
>      INT_PTR res;
> - ULONG_PTR actctx_cookie = 0;
> -
> - GetCurrentActCtx(&This->user_actctx);

In case of nested `Show()` calls, you should either:

1. Fail with `E_UNEXPECTED`, or
2. Backup the previous `user_actctx` value before calling `GetCurrentActCtx`.