Re: [PATCH v6 0/9] MR6323: winewayland: Support GL/VK rendering in child windows (alt).

[Alexandros Frantzis (＠afrantzis)]

Alexandros Frantzis (@afrantzis) commented about dlls/winewayland.drv/opengl.c:
> gl->hwnd = hwnd;
>      gl->swap_interval = 1;
>
> +    NtUserGetClientRect(gl->hwnd, &client_rect, NtUserGetDpiForWindow(gl->hwnd));

When creating pbuffers we have hwnd=0, which causes `NtUserGetClientRect` to fail and client_rect to remain uninitialized, leading to problems below.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/6323#note_83040