Re: [PATCH v4 0/2] MR10324: win32u: Fix deadlock when setting hdc_src to the window's self DC.

[Zhao Yi (＠Zhaoyi)]

Zhao Yi (@Zhaoyi) commented about dlls/win32u/window.c:
> apply_window_pos( hwnd, 0, swp_flags, surface, &new_rects, NULL );
>      if (!surface) return FALSE;
>
> if (!hdc_src || surface == &dummy_surface)

I agree with your view regarding the scenario you tested above: we can ignore surface content updates when hdc is the window DC. And we may probably fix this bug as follws:

```suggestion:-0+0
    if (!hdc_src || surface == &dummy_surface || NtUserWindowFromDC( hdc_src ) == hwnd)
```

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https://gitlab.winehq.org/wine/wine/-/merge_requests/10324#note_134745